* image quality of Labtec Webcam 2200
@ 2009-09-11 7:09 Németh Márton
2009-09-11 18:17 ` Németh Márton
2009-09-13 7:20 ` Jean-Francois Moine
0 siblings, 2 replies; 12+ messages in thread
From: Németh Márton @ 2009-09-11 7:09 UTC (permalink / raw)
To: Thomas Kaiser, Jean-Francois Moine; +Cc: V4L Mailing List
Hi,
I have a Labtec Webcam 2200 and I have problems with the image quality
with Linux 2.6.31 + libv4l 0.6.1. I made some experiments and stored
each captured image as raw data and when libv4l was able to convert
then I also stored the result as bmp.
You can find my results at http://v4l-test.sourceforge.net/results/test-20090911/index.html
There are three types of problems:
a) Sometimes the picture contains a 8x8 pixel error, like in image #9
http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009
b) Sometimes the brightness of the half picture is changed, like in
images #7, #36 and #37
http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007
http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036
http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037
c) Sometimes the libv4l cannot convert the raw image and the errno
is set to EAGAIN (11), for example image #1, #2 and #3
Do you know how can I fix these problems?
Regards,
Márton Németh
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: image quality of Labtec Webcam 2200 2009-09-11 7:09 image quality of Labtec Webcam 2200 Németh Márton @ 2009-09-11 18:17 ` Németh Márton 2009-09-12 0:43 ` leandro Costantino ` (2 more replies) 2009-09-13 7:20 ` Jean-Francois Moine 1 sibling, 3 replies; 12+ messages in thread From: Németh Márton @ 2009-09-11 18:17 UTC (permalink / raw) To: Thomas Kaiser, Jean-Francois Moine, Luc Saillard Cc: V4L Mailing List, Németh Márton Márton Németh wrote: > Hi, > > I have a Labtec Webcam 2200 and I have problems with the image quality > with Linux 2.6.31 + libv4l 0.6.1. I made some experiments and stored > each captured image as raw data and when libv4l was able to convert > then I also stored the result as bmp. > > You can find my results at http://v4l-test.sourceforge.net/results/test-20090911/index.html > There are three types of problems: > a) Sometimes the picture contains a 8x8 pixel error, like in image #9 > http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 > b) Sometimes the brightness of the half picture is changed, like in > images #7, #36 and #37 > http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 > http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 > http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 > c) Sometimes the libv4l cannot convert the raw image and the errno > is set to EAGAIN (11), for example image #1, #2 and #3 > > Do you know how can I fix these problems? I investigated the c) point a little bit. When I get a negative return value from the v4lconvert_convert() function then I print out the error message what the v4lconvert_get_error_message() function returns. With the result log file I executed a "grep v4l-convert |sort |uniq" command. All the error messages are coming from the tinyjpeg.c (Small jpeg decoder library): v4l-convert: error decompressing JPEG: error: more then 63 AC components (65) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (66) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (67) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (68) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (69) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (70) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (71) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (72) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (73) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (75) in huffman unit v4l-convert: error decompressing JPEG: error: more then 63 AC components (76) in huffman unit v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x00 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x01 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x02 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x04 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x08 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x09 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x0a v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x10 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x12 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x14 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1a v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1b v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1c v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1f v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x80 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x82 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x87 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x88 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x89 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8a v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8b v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8c v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8d v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8e v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8f v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x90 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x91 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x92 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x93 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x94 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x95 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x96 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x97 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x99 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9b v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9c v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9d v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9e v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9f v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa3 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa5 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa6 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa7 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa9 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaa v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xab v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xad v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaf v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb3 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb5 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb7 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb8 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb9 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbc v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbd v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbe v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbf v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc0 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc4 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc6 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc7 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc9 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcb v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcc v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcf v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd1 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd2 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd3 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd4 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdc v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdf v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe5 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe7 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe8 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xea v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xeb v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xec v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf0 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf2 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf4 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf5 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf8 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf9 v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfa v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfc v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfe v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xff v4l-convert: error decompressing JPEG: Pixart JPEG error, stream does not end with EOF marker v4l-convert: error decompressing JPEG: unknown huffman code: 0000ff81 v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffec v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffff Regards, Márton Németh ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: image quality of Labtec Webcam 2200 2009-09-11 18:17 ` Németh Márton @ 2009-09-12 0:43 ` leandro Costantino 2009-09-12 1:21 ` leandro Costantino [not found] ` <c2fe070d0909111741l21120025v3f45eb8566d27c7a@mail.gmail.com> 2 siblings, 0 replies; 12+ messages in thread From: leandro Costantino @ 2009-09-12 0:43 UTC (permalink / raw) To: V4L Mailing List Hi , i tested it with 2.6.31-rc9 & libvl 0.6.1 + svv and cannot reproduce. 301147.626826] gspca: probing 093a:2626 [301147.641578] gspca: probe ok [301147.641607] gspca: probing 093a:2626 [301147.641770] gspca: probing 093a:2626 [301147.641829] usbcore: registered new interface driver pac7311 [301147.641835] pac7311: registered Could you try testing with svv.c app? pd: quality is not the best, but works ok. Seem that the format is not the proper or expected "pjpeg" on your streaming. 2009/9/11 Németh Márton <nm127@freemail.hu>: > Márton Németh wrote: >> Hi, >> >> I have a Labtec Webcam 2200 and I have problems with the image quality >> with Linux 2.6.31 + libv4l 0.6.1. I made some experiments and stored >> each captured image as raw data and when libv4l was able to convert >> then I also stored the result as bmp. >> >> You can find my results at http://v4l-test.sourceforge.net/results/test-20090911/index.html >> There are three types of problems: >> a) Sometimes the picture contains a 8x8 pixel error, like in image #9 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 >> b) Sometimes the brightness of the half picture is changed, like in >> images #7, #36 and #37 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 >> c) Sometimes the libv4l cannot convert the raw image and the errno >> is set to EAGAIN (11), for example image #1, #2 and #3 >> >> Do you know how can I fix these problems? > > I investigated the c) point a little bit. When I get a negative return value > from the v4lconvert_convert() function then I print out the error message what the > v4lconvert_get_error_message() function returns. With the result log file > I executed a "grep v4l-convert |sort |uniq" command. All the error messages are > coming from the tinyjpeg.c (Small jpeg decoder library): > > v4l-convert: error decompressing JPEG: error: more then 63 AC components (65) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (66) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (67) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (68) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (69) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (70) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (71) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (72) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (73) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (75) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (76) in huffman unit > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x00 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x01 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x02 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x04 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x08 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x09 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x0a > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x10 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x12 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x14 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1a > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1b > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1c > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1f > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x80 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x82 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x87 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x88 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x89 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8a > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8b > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8c > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8d > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8e > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8f > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x90 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x91 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x92 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x93 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x94 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x95 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x96 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x97 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x99 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9b > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9c > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9d > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9e > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9f > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa3 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa5 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa6 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa7 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa9 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaa > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xab > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xad > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaf > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb3 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb5 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb7 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb8 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb9 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbc > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbd > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbe > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbf > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc0 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc4 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc6 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc7 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc9 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcb > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcc > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcf > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd1 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd2 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd3 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd4 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdc > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdf > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe5 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe7 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe8 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xea > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xeb > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xec > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf0 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf2 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf4 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf5 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf8 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf9 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfa > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfc > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfe > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xff > v4l-convert: error decompressing JPEG: Pixart JPEG error, stream does not end with EOF marker > v4l-convert: error decompressing JPEG: unknown huffman code: 0000ff81 > v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffec > v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffff > > Regards, > > Márton Németh > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: image quality of Labtec Webcam 2200 2009-09-11 18:17 ` Németh Márton 2009-09-12 0:43 ` leandro Costantino @ 2009-09-12 1:21 ` leandro Costantino [not found] ` <c2fe070d0909111741l21120025v3f45eb8566d27c7a@mail.gmail.com> 2 siblings, 0 replies; 12+ messages in thread From: leandro Costantino @ 2009-09-12 1:21 UTC (permalink / raw) To: Németh Márton Cc: Thomas Kaiser, Jean-Francois Moine, Luc Saillard, V4L Mailing List Also , about the negative value. It happens to when using Pac7311 on libv4l_convert. Usually it an -EAGAIN, that should be ignored. svv application, just ignore that, and another apps take in account. But would be nice to re test your webcam to find where the real problem is. Best Regards 2009/9/11 Németh Márton <nm127@freemail.hu>: > Márton Németh wrote: >> Hi, >> >> I have a Labtec Webcam 2200 and I have problems with the image quality >> with Linux 2.6.31 + libv4l 0.6.1. I made some experiments and stored >> each captured image as raw data and when libv4l was able to convert >> then I also stored the result as bmp. >> >> You can find my results at http://v4l-test.sourceforge.net/results/test-20090911/index.html >> There are three types of problems: >> a) Sometimes the picture contains a 8x8 pixel error, like in image #9 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 >> b) Sometimes the brightness of the half picture is changed, like in >> images #7, #36 and #37 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 >> c) Sometimes the libv4l cannot convert the raw image and the errno >> is set to EAGAIN (11), for example image #1, #2 and #3 >> >> Do you know how can I fix these problems? > > I investigated the c) point a little bit. When I get a negative return value > from the v4lconvert_convert() function then I print out the error message what the > v4lconvert_get_error_message() function returns. With the result log file > I executed a "grep v4l-convert |sort |uniq" command. All the error messages are > coming from the tinyjpeg.c (Small jpeg decoder library): > > v4l-convert: error decompressing JPEG: error: more then 63 AC components (65) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (66) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (67) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (68) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (69) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (70) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (71) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (72) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (73) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (75) in huffman unit > v4l-convert: error decompressing JPEG: error: more then 63 AC components (76) in huffman unit > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x00 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x01 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x02 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x04 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x08 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x09 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x0a > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x10 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x12 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x14 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1a > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1b > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1c > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1f > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x80 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x82 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x87 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x88 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x89 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8a > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8b > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8c > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8d > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8e > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8f > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x90 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x91 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x92 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x93 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x94 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x95 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x96 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x97 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x99 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9b > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9c > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9d > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9e > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9f > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa3 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa5 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa6 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa7 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa9 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaa > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xab > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xad > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaf > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb3 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb5 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb7 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb8 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb9 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbc > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbd > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbe > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbf > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc0 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc4 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc6 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc7 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc9 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcb > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcc > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcf > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd1 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd2 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd3 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd4 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdc > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdf > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe5 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe7 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe8 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xea > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xeb > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xec > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf0 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf2 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf4 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf5 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf8 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf9 > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfa > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfc > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfe > v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xff > v4l-convert: error decompressing JPEG: Pixart JPEG error, stream does not end with EOF marker > v4l-convert: error decompressing JPEG: unknown huffman code: 0000ff81 > v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffec > v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffff > > Regards, > > Márton Németh > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > ^ permalink raw reply [flat|nested] 12+ messages in thread
[parent not found: <c2fe070d0909111741l21120025v3f45eb8566d27c7a@mail.gmail.com>]
[parent not found: <4AAB3CB5.7090106@freemail.hu>]
* Re: image quality of Labtec Webcam 2200 [not found] ` <4AAB3CB5.7090106@freemail.hu> @ 2009-09-12 14:51 ` leandro Costantino 2009-09-12 18:26 ` Németh Márton 0 siblings, 1 reply; 12+ messages in thread From: leandro Costantino @ 2009-09-12 14:51 UTC (permalink / raw) To: Németh Márton Cc: Thomas Kaiser, Jean-Francois Moine, Luc Saillard, V4L Mailing List Nice, i will take a look. Anyway, be aware, that the "conversion error", is something expected on pac7311, in fact, Hans have commented that on the libv4lconvert. ...... if (result) { /* Pixart webcam's seem to regulary generate corrupt frames, which are best thrown away to avoid flashes in the video stream. Tell the upper layer this is an intermediate fault and it should try again with a new buffer by setting errno to EAGAIN */ if (src_pix_fmt == V4L2_PIX_FMT_PJPG || data->flags & V4LCONVERT_IS_SN9C20X) { V4LCONVERT_ERR("decompressing JPEG: %s", tinyjpeg_get_errorstring(data->jdec)); errno = EAGAIN; return -1; ........ That's the result of the EAGAIN. About, the half brightness picture, did that happens when autogain is off? Best Regards On Sat, Sep 12, 2009 at 2:16 AM, Németh Márton <nm127@freemail.hu> wrote: > Hello, > > thank you for looking at this topic. > > leandro Costantino wrote: >> > Hi , >> > i tested it with 2.6.31-rc9 & libvl 0.6.1 + svv and cannot reproduce. >> > >> > 301147.626826] gspca: probing 093a:2626 >> > [301147.641578] gspca: probe ok >> > [301147.641607] gspca: probing 093a:2626 >> > [301147.641770] gspca: probing 093a:2626 >> > [301147.641829] usbcore: registered new interface driver pac7311 >> > [301147.641835] pac7311: registered > > I have the same dmesg output. My Labtec Webcam 2200 has the following labels > on the cable: > > M/N: V-UCE52 > P/N: 860-000073 > PID: CE73902 > > Maybe there is more than one revision of the Labtec Webcam 2200 and I have > one with a different hardware/firmware inside? > >> > Could you try testing with svv.c app? > > I used a bit modified svv.c to create the measurement result. The > modifications are to create the output HTML report and save the raw > and the BMP images. The display is not correct because I changed > the format from V4L2_PIX_FMT_RGB24 to V4L2_PIX_FMT_BGR24 to easily > save the result to BMP. The source code quality is not the best, > I am sorry about that, but I can still attach my source code which I > modified a little bit since my last report. > >> > pd: quality is not the best, but works ok. Seem that the format is not >> > the proper or expected "pjpeg" on your streaming. > > Do you think about USB transfer problem? > > Regards, > > Márton Németh > >> > 2009/9/11 Németh Márton <nm127@freemail.hu>: >>> >> Márton Németh wrote: >>>> >>> Hi, >>>> >>> >>>> >>> I have a Labtec Webcam 2200 and I have problems with the image quality >>>> >>> with Linux 2.6.31 + libv4l 0.6.1. I made some experiments and stored >>>> >>> each captured image as raw data and when libv4l was able to convert >>>> >>> then I also stored the result as bmp. >>>> >>> >>>> >>> You can find my results at http://v4l-test.sourceforge.net/results/test-20090911/index.html >>>> >>> There are three types of problems: >>>> >>> a) Sometimes the picture contains a 8x8 pixel error, like in image #9 >>>> >>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 >>>> >>> b) Sometimes the brightness of the half picture is changed, like in >>>> >>> images #7, #36 and #37 >>>> >>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 >>>> >>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 >>>> >>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 >>>> >>> c) Sometimes the libv4l cannot convert the raw image and the errno >>>> >>> is set to EAGAIN (11), for example image #1, #2 and #3 >>>> >>> >>>> >>> Do you know how can I fix these problems? >>> >> I investigated the c) point a little bit. When I get a negative return value >>> >> from the v4lconvert_convert() function then I print out the error message what the >>> >> v4lconvert_get_error_message() function returns. With the result log file >>> >> I executed a "grep v4l-convert |sort |uniq" command. All the error messages are >>> >> coming from the tinyjpeg.c (Small jpeg decoder library): >>> >> >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (65) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (66) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (67) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (68) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (69) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (70) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (71) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (72) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (73) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (75) in huffman unit >>> >> v4l-convert: error decompressing JPEG: error: more then 63 AC components (76) in huffman unit >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x00 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x01 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x02 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x04 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x08 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x09 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x0a >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x10 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x12 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x14 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1a >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1b >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1c >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1f >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x80 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x82 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x87 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x88 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x89 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8a >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8b >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8c >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8d >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8e >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8f >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x90 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x91 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x92 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x93 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x94 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x95 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x96 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x97 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x99 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9b >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9c >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9d >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9e >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9f >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa3 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa5 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa6 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa7 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa9 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaa >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xab >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xad >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaf >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb3 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb5 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb7 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb8 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb9 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbc >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbd >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbe >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbf >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc0 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc4 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc6 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc7 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc9 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcb >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcc >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcf >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd1 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd2 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd3 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd4 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdc >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdf >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe5 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe7 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe8 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xea >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xeb >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xec >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf0 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf2 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf4 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf5 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf8 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf9 >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfa >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfc >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfe >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xff >>> >> v4l-convert: error decompressing JPEG: Pixart JPEG error, stream does not end with EOF marker >>> >> v4l-convert: error decompressing JPEG: unknown huffman code: 0000ff81 >>> >> v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffec >>> >> v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffff >>> >> >>> >> Regards, >>> >> >>> >> Márton Németh >>> >> -- >>> >> To unsubscribe from this list: send the line "unsubscribe linux-media" in >>> >> the body of a message to majordomo@vger.kernel.org >>> >> More majordomo info at http://vger.kernel.org/majordomo-info.html > ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: image quality of Labtec Webcam 2200 2009-09-12 14:51 ` leandro Costantino @ 2009-09-12 18:26 ` Németh Márton 0 siblings, 0 replies; 12+ messages in thread From: Németh Márton @ 2009-09-12 18:26 UTC (permalink / raw) To: leandro Costantino Cc: Thomas Kaiser, Jean-Francois Moine, Luc Saillard, V4L Mailing List, Németh Márton leandro Costantino wrote: > Nice, i will take a look. > Anyway, be aware, that the "conversion error", is something expected > on pac7311, in fact, Hans have commented that on the libv4lconvert. > ...... > if (result) { > /* Pixart webcam's seem to regulary generate corrupt frames, which > are best thrown away to avoid flashes in the video stream. Tell > the upper layer this is an intermediate fault and it should try > again with a new buffer by setting errno to EAGAIN */ > if (src_pix_fmt == V4L2_PIX_FMT_PJPG || > data->flags & V4LCONVERT_IS_SN9C20X) { > V4LCONVERT_ERR("decompressing JPEG: %s", > tinyjpeg_get_errorstring(data->jdec)); > errno = EAGAIN; > return -1; > ........ > That's the result of the EAGAIN. The corrupted data coming from the device would be one reason. An other reason could be the limitation of the libv4l 0.6.1 that it cannot understand the raw data coming from the webcam. Maybe the raw data does not fulfill the JPEG specification but still could have some meaning -- which we don't understand at the moment. The different types of error messages mean for me that at least some of them could be solved (i.e. "unknown huffman code"). > About, the half brightness picture, did that happens when autogain is off? Yes, I tried to switch the "Auto Gain" control off before starting a measurement. The half brightness pictures appears time to time. Regards, Márton Németh > Best Regards > On Sat, Sep 12, 2009 at 2:16 AM, Németh Márton <nm127@freemail.hu> wrote: >> Hello, >> >> thank you for looking at this topic. >> >> leandro Costantino wrote: >>>> Hi , >>>> i tested it with 2.6.31-rc9 & libvl 0.6.1 + svv and cannot reproduce. >>>> >>>> 301147.626826] gspca: probing 093a:2626 >>>> [301147.641578] gspca: probe ok >>>> [301147.641607] gspca: probing 093a:2626 >>>> [301147.641770] gspca: probing 093a:2626 >>>> [301147.641829] usbcore: registered new interface driver pac7311 >>>> [301147.641835] pac7311: registered >> I have the same dmesg output. My Labtec Webcam 2200 has the following labels >> on the cable: >> >> M/N: V-UCE52 >> P/N: 860-000073 >> PID: CE73902 >> >> Maybe there is more than one revision of the Labtec Webcam 2200 and I have >> one with a different hardware/firmware inside? >> >>>> Could you try testing with svv.c app? >> I used a bit modified svv.c to create the measurement result. The >> modifications are to create the output HTML report and save the raw >> and the BMP images. The display is not correct because I changed >> the format from V4L2_PIX_FMT_RGB24 to V4L2_PIX_FMT_BGR24 to easily >> save the result to BMP. The source code quality is not the best, >> I am sorry about that, but I can still attach my source code which I >> modified a little bit since my last report. >> >>>> pd: quality is not the best, but works ok. Seem that the format is not >>>> the proper or expected "pjpeg" on your streaming. >> Do you think about USB transfer problem? >> >> Regards, >> >> Márton Németh >> >>>> 2009/9/11 Németh Márton <nm127@freemail.hu>: >>>>>> Márton Németh wrote: >>>>>>>> Hi, >>>>>>>> >>>>>>>> I have a Labtec Webcam 2200 and I have problems with the image quality >>>>>>>> with Linux 2.6.31 + libv4l 0.6.1. I made some experiments and stored >>>>>>>> each captured image as raw data and when libv4l was able to convert >>>>>>>> then I also stored the result as bmp. >>>>>>>> >>>>>>>> You can find my results at http://v4l-test.sourceforge.net/results/test-20090911/index.html >>>>>>>> There are three types of problems: >>>>>>>> a) Sometimes the picture contains a 8x8 pixel error, like in image #9 >>>>>>>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 >>>>>>>> b) Sometimes the brightness of the half picture is changed, like in >>>>>>>> images #7, #36 and #37 >>>>>>>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 >>>>>>>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 >>>>>>>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 >>>>>>>> c) Sometimes the libv4l cannot convert the raw image and the errno >>>>>>>> is set to EAGAIN (11), for example image #1, #2 and #3 >>>>>>>> >>>>>>>> Do you know how can I fix these problems? >>>>>> I investigated the c) point a little bit. When I get a negative return value >>>>>> from the v4lconvert_convert() function then I print out the error message what the >>>>>> v4lconvert_get_error_message() function returns. With the result log file >>>>>> I executed a "grep v4l-convert |sort |uniq" command. All the error messages are >>>>>> coming from the tinyjpeg.c (Small jpeg decoder library): >>>>>> >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (65) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (66) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (67) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (68) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (69) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (70) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (71) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (72) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (73) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (75) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: error: more then 63 AC components (76) in huffman unit >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x00 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x01 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x02 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x04 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x08 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x09 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x0a >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x10 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x12 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x14 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1a >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1b >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1c >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x1f >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x80 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x82 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x87 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x88 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x89 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8a >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8b >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8c >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8d >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8e >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x8f >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x90 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x91 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x92 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x93 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x94 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x95 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x96 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x97 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x99 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9b >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9c >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9d >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9e >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0x9f >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa3 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa5 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa6 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa7 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xa9 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaa >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xab >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xad >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xaf >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb3 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb5 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb7 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb8 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xb9 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbc >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbd >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbe >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xbf >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc0 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc4 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc6 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc7 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xc9 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcb >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcc >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xcf >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd1 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd2 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd3 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xd4 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdc >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xdf >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe5 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe7 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xe8 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xea >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xeb >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xec >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf0 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf2 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf4 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf5 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf8 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xf9 >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfa >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfc >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xfe >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error: invalid MCU marker: 0xff >>>>>> v4l-convert: error decompressing JPEG: Pixart JPEG error, stream does not end with EOF marker >>>>>> v4l-convert: error decompressing JPEG: unknown huffman code: 0000ff81 >>>>>> v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffec >>>>>> v4l-convert: error decompressing JPEG: unknown huffman code: 0000ffff >>>>>> >>>>>> Regards, >>>>>> >>>>>> Márton Németh ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: image quality of Labtec Webcam 2200 2009-09-11 7:09 image quality of Labtec Webcam 2200 Németh Márton 2009-09-11 18:17 ` Németh Márton @ 2009-09-13 7:20 ` Jean-Francois Moine 2009-09-13 11:00 ` Németh Márton 2009-09-13 18:48 ` Hans de Goede 1 sibling, 2 replies; 12+ messages in thread From: Jean-Francois Moine @ 2009-09-13 7:20 UTC (permalink / raw) To: Németh Márton Cc: Thomas Kaiser, V4L Mailing List, leandro Costantino, Hans de Goede On Fri, 11 Sep 2009 09:09:20 +0200 Németh Márton <nm127@freemail.hu> wrote: > You can find my results at > http://v4l-test.sourceforge.net/results/test-20090911/index.html > There are three types of problems: a) Sometimes the picture contains > a 8x8 pixel error, like in image #9 > http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 > b) Sometimes the brightness of the half picture is changed, like in > images #7, #36 and #37 > http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 > http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 > http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 > c) Sometimes the libv4l cannot convert the raw image and the errno is > set to EAGAIN (11), for example image #1, #2 and #3 > > Do you know how can I fix these problems? The error EAGAIN is normal when decoding pac7311 images, because they are rotated 90°. But this error should occur one time only. I looked at the raw image #1, and it seems that there are JPEG errors inside (sequences ff ff). There should be a problem in the pac7311 driver. Hans, may you confirm? -- Ken ar c'hentañ | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/ ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: image quality of Labtec Webcam 2200 2009-09-13 7:20 ` Jean-Francois Moine @ 2009-09-13 11:00 ` Németh Márton 2009-09-13 14:42 ` leandro Costantino 2009-09-13 18:48 ` Hans de Goede 1 sibling, 1 reply; 12+ messages in thread From: Németh Márton @ 2009-09-13 11:00 UTC (permalink / raw) To: Jean-Francois Moine Cc: Thomas Kaiser, V4L Mailing List, leandro Costantino, Hans de Goede Jean-Francois Moine wrote: > On Fri, 11 Sep 2009 09:09:20 +0200 > Németh Márton <nm127@freemail.hu> wrote: > >> You can find my results at >> http://v4l-test.sourceforge.net/results/test-20090911/index.html >> There are three types of problems: a) Sometimes the picture contains >> a 8x8 pixel error, like in image #9 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 >> b) Sometimes the brightness of the half picture is changed, like in >> images #7, #36 and #37 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 >> c) Sometimes the libv4l cannot convert the raw image and the errno is >> set to EAGAIN (11), for example image #1, #2 and #3 >> >> Do you know how can I fix these problems? > > The error EAGAIN is normal when decoding pac7311 images, because they > are rotated 90°. But this error should occur one time only. I have the feeling that the Labtec Webcam 2200 is not based on the PAC7311 but on PAC7312. The PAC7312 also contains a microphone input and the Labtec Webcam 2200 also have a built-in microphone. See http://www.pixart.com.tw/productsditel.asp?ToPage=1&productclassify_id=12&productclassify2_id=33 for the datasheets. See also http://labtec.com/index.cfm/gear/details/EUR/EN,crid=30,contentid=761 . > I looked at the raw image #1, and it seems that there are JPEG errors > inside (sequences ff ff). There should be a problem in the pac7311 > driver. Hans, may you confirm? > ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: image quality of Labtec Webcam 2200 2009-09-13 11:00 ` Németh Márton @ 2009-09-13 14:42 ` leandro Costantino 2009-09-13 15:59 ` Thomas Kaiser 0 siblings, 1 reply; 12+ messages in thread From: leandro Costantino @ 2009-09-13 14:42 UTC (permalink / raw) To: Németh Márton Cc: Jean-Francois Moine, Thomas Kaiser, V4L Mailing List, Hans de Goede Actually it based on pac7302. Pac7311/02 also has support ( since gspca1 ). I checked some old logs of the pac, and the driver init for 7302 seems ok. The "ff ff ff" sequence, seems to been taken in account on conversion. (libv4lconvert) /* Special Pixart versions of the *_nbits functions, these remove the special ff ff ff xx sequences pixart cams insert from the bitstream */ #define pixart_fill_nbits(reservoir,nbits_in_reservoir,stream,nbits_wanted) \ This is really a tricky cam. I be back on windows to do further test. pd: Nemeth, i could reproduce your problems now. 2009/9/13 Németh Márton <nm127@freemail.hu>: > Jean-Francois Moine wrote: >> On Fri, 11 Sep 2009 09:09:20 +0200 >> Németh Márton <nm127@freemail.hu> wrote: >> >>> You can find my results at >>> http://v4l-test.sourceforge.net/results/test-20090911/index.html >>> There are three types of problems: a) Sometimes the picture contains >>> a 8x8 pixel error, like in image #9 >>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 >>> b) Sometimes the brightness of the half picture is changed, like in >>> images #7, #36 and #37 >>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 >>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 >>> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 >>> c) Sometimes the libv4l cannot convert the raw image and the errno is >>> set to EAGAIN (11), for example image #1, #2 and #3 >>> >>> Do you know how can I fix these problems? >> >> The error EAGAIN is normal when decoding pac7311 images, because they >> are rotated 90°. But this error should occur one time only. > > I have the feeling that the Labtec Webcam 2200 is not based on the PAC7311 > but on PAC7312. The PAC7312 also contains a microphone input and the > Labtec Webcam 2200 also have a built-in microphone. > See http://www.pixart.com.tw/productsditel.asp?ToPage=1&productclassify_id=12&productclassify2_id=33 > for the datasheets. See also http://labtec.com/index.cfm/gear/details/EUR/EN,crid=30,contentid=761 . > >> I looked at the raw image #1, and it seems that there are JPEG errors >> inside (sequences ff ff). There should be a problem in the pac7311 >> driver. Hans, may you confirm? >> > > ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: image quality of Labtec Webcam 2200 2009-09-13 14:42 ` leandro Costantino @ 2009-09-13 15:59 ` Thomas Kaiser 2009-09-13 18:50 ` Hans de Goede 0 siblings, 1 reply; 12+ messages in thread From: Thomas Kaiser @ 2009-09-13 15:59 UTC (permalink / raw) To: leandro Costantino Cc: Németh Márton, Jean-Francois Moine, V4L Mailing List, Hans de Goede On 09/13/2009 04:42 PM, leandro Costantino wrote: > Actually it based on pac7302. Pac7311/02 also has support ( since gspca1 ). > > I checked some old logs of the pac, and the driver init for 7302 seems ok. > > The "ff ff ff" sequence, seems to been taken in account on conversion. > (libv4lconvert) > > /* Special Pixart versions of the *_nbits functions, these remove the special > ff ff ff xx sequences pixart cams insert from the bitstream */ > #define pixart_fill_nbits(reservoir,nbits_in_reservoir,stream,nbits_wanted) \ > > This is really a tricky cam. I be back on windows to do further test. Hey All I thought Hans will come in, in this discussion....... Anyway, I introduced support for the PAC7311 in gspcaV1 in 2006 [1] Pixart is using a proprietary JEPG Format to code the image. It took me (and help from Jörg Schummer) more than a year to find out the basics to decode a frame. They have this 0xffffffxx markers in the stream, I don't know for what this is good, just skip it. And they have a "MCU marker" for each MCU. As we know so far, this MCU marker tells what Quantization table should be used for decoding the MCU. Hans did implement my findings into lib4vl and improved it :-) So, when you get this errors, this is due to a unknown format Pixart is using. I guess we should know what marker you get and how the image should look like. Don't forget, this is all re-engineered -> guess work! Thomas [1] http://www.kaiser-linux.li/index.php?title=PAC7311 ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: image quality of Labtec Webcam 2200 2009-09-13 15:59 ` Thomas Kaiser @ 2009-09-13 18:50 ` Hans de Goede 0 siblings, 0 replies; 12+ messages in thread From: Hans de Goede @ 2009-09-13 18:50 UTC (permalink / raw) To: Thomas Kaiser Cc: leandro Costantino, Németh Márton, Jean-Francois Moine, V4L Mailing List Hi, On 09/13/2009 05:59 PM, Thomas Kaiser wrote: > I thought Hans will come in, in this discussion....... > Hey hey, its weekend, give me some time to respond already :) See my reply higher up in the thread. Regards, Hans ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: image quality of Labtec Webcam 2200 2009-09-13 7:20 ` Jean-Francois Moine 2009-09-13 11:00 ` Németh Márton @ 2009-09-13 18:48 ` Hans de Goede 1 sibling, 0 replies; 12+ messages in thread From: Hans de Goede @ 2009-09-13 18:48 UTC (permalink / raw) To: Jean-Francois Moine Cc: Németh Márton, Thomas Kaiser, V4L Mailing List, leandro Costantino Hi, On 09/13/2009 09:20 AM, Jean-Francois Moine wrote: > On Fri, 11 Sep 2009 09:09:20 +0200 > Németh Márton<nm127@freemail.hu> wrote: > >> You can find my results at >> http://v4l-test.sourceforge.net/results/test-20090911/index.html >> There are three types of problems: a) Sometimes the picture contains >> a 8x8 pixel error, like in image #9 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00009 >> b) Sometimes the brightness of the half picture is changed, like in >> images #7, #36 and #37 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00007 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00036 >> http://v4l-test.sourceforge.net/results/test-20090911/index.html#img00037 >> c) Sometimes the libv4l cannot convert the raw image and the errno is >> set to EAGAIN (11), for example image #1, #2 and #3 >> >> Do you know how can I fix these problems? > > The error EAGAIN is normal when decoding pac7311 images, because they > are rotated 90°. But this error should occur one time only. > > I looked at the raw image #1, and it seems that there are JPEG errors > inside (sequences ff ff). There should be a problem in the pac7311 > driver. Hans, may you confirm? > The pac7311 / pac7302 are very cheap crap cams (I bought one brand new for 3 euros, and that was not in the bargain bin). These cams use a custom jpeg format, and we are very luky to be able to decompress this at all (thanks to some of the wizards who worked on the original gspca driver). Yes there are still some issues, but with no documentation what soever, and unreliable hardware (I've seen hang cams which needed to be unplugged / replugged to start working again), I'm afraid there is nothing we can do. Still if people want to work on improving support for them more power to then, I'll gladly help where I can. The ff ff you've found are special Pixart padding sequences, see tinyjpeg.c: pixart_fill_nbits() Also interesting is the comment about some of the special Pxiart markers in the tinyjpeg.c: pixart_decode_MCU_2x1_3planes() function. Which summaries what i've learned while getting pac7302 cams to work (to a certain extend). Regards, Hans ^ permalink raw reply [flat|nested] 12+ messages in thread
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2009-09-11 7:09 image quality of Labtec Webcam 2200 Németh Márton
2009-09-11 18:17 ` Németh Márton
2009-09-12 0:43 ` leandro Costantino
2009-09-12 1:21 ` leandro Costantino
[not found] ` <c2fe070d0909111741l21120025v3f45eb8566d27c7a@mail.gmail.com>
[not found] ` <4AAB3CB5.7090106@freemail.hu>
2009-09-12 14:51 ` leandro Costantino
2009-09-12 18:26 ` Németh Márton
2009-09-13 7:20 ` Jean-Francois Moine
2009-09-13 11:00 ` Németh Márton
2009-09-13 14:42 ` leandro Costantino
2009-09-13 15:59 ` Thomas Kaiser
2009-09-13 18:50 ` Hans de Goede
2009-09-13 18:48 ` Hans de Goede
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