* libv4l: problem with 2x downscaling + Labtec Webcam 2200
@ 2009-08-15 6:53 Németh Márton
2009-08-15 9:05 ` Hans de Goede
0 siblings, 1 reply; 3+ messages in thread
From: Németh Márton @ 2009-08-15 6:53 UTC (permalink / raw)
To: Hans de Goede; +Cc: Jean-François Moine, linux-media
Hello Hans,
I am using your libv4l 0.6.0 [1] together with the driver gspca_pac7311
from Linux kernel 2.6.31-rc4 and with Labtec Webcam 2200 hardware [2]. I
am using the svv.c [3] to display the webcam image.
When I'm using the webcam in 640x480 the image is displayed correctly.
However, when I set the resolution to 320x240, the image is not correct:
the image contains horizontal lines and doubled vertically. I guess the
conversion from 640x480 is not done just the pixels are shown as it would
be 320x240.
$ ./svv -f 320x240
raw pixfmt: PJPG 640x480
pixfmt: RGB3 320x240
mmap method
What do you think the problem could be?
References:
[1] libv4l
http://freshmeat.net/projects/libv4l
[2] Labtec Webcam 2200
http://labtec.com/index.cfm/service/listing/EUR/EN,crid=68,crid2=1764
[3] svv.c
http://moinejf.free.fr/svv.c
$ v4l-info
### v4l2 device info [/dev/video0] ###
general info
VIDIOC_QUERYCAP
driver : "pac7311"
card : "USB Camera (093a:2626)"
bus_info : "usb-0000:00:10.1-1"
version : 2.6.0
capabilities : 0x5000001 [VIDEO_CAPTURE,READWRITE,STREAMING]
standards
inputs
VIDIOC_ENUMINPUT(0)
index : 0
name : "pac7311"
type : CAMERA
audioset : 0
tuner : 0
std : 0x0 []
status : 0x0 []
video capture
VIDIOC_ENUM_FMT(0,VIDEO_CAPTURE)
index : 0
type : VIDEO_CAPTURE
flags : 0
description : "PJPG"
pixelformat : 0x47504a50 [PJPG]
VIDIOC_G_FMT(VIDEO_CAPTURE)
type : VIDEO_CAPTURE
fmt.pix.width : 640
fmt.pix.height : 480
fmt.pix.pixelformat : 0x47504a50 [PJPG]
fmt.pix.field : NONE
fmt.pix.bytesperline : 640
fmt.pix.sizeimage : 115790
fmt.pix.colorspace : JPEG
fmt.pix.priv : 0
controls
VIDIOC_QUERYCTRL(BASE+0)
id : 9963776
type : INTEGER
name : "Brightness"
minimum : 0
maximum : 32
step : 1
default_value : 16
flags : 0
VIDIOC_QUERYCTRL(BASE+1)
id : 9963777
type : INTEGER
name : "Contrast"
minimum : 0
maximum : 255
step : 1
default_value : 127
flags : 0
VIDIOC_QUERYCTRL(BASE+2)
id : 9963778
type : INTEGER
name : "Saturation"
minimum : 0
maximum : 255
step : 1
default_value : 127
flags : 0
### video4linux device info [/dev/video0] ###
general info
VIDIOCGCAP
name : "USB Camera (093a:2626)"
type : 0x1 [CAPTURE]
channels : 1
audios : 0
maxwidth : 640
maxheight : 480
minwidth : 48
minheight : 32
channels
VIDIOCGCHAN(0)
channel : 0
name : "pac7311"
tuners : 0
flags : 0x0 []
type : CAMERA
norm : 0
tuner
ioctl VIDIOCGTUNER: Invalid argument
audio
VIDIOCGAUDIO
audio : 0
volume : 0
bass : 0
treble : 0
picture
VIDIOCGPICT
brightness : 32768
hue : 0
colour : 32639
contrast : 32639
whiteness : 0
depth : 8
palette : unknown
buffer
ioctl VIDIOCGFBUF: Invalid argument
window
VIDIOCGWIN
x : 0
y : 0
width : 640
height : 480
chromakey : 0
flags : 0
Regards,
Márton Németh
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: libv4l: problem with 2x downscaling + Labtec Webcam 2200
2009-08-15 6:53 libv4l: problem with 2x downscaling + Labtec Webcam 2200 Németh Márton
@ 2009-08-15 9:05 ` Hans de Goede
2009-08-16 5:25 ` Németh Márton
0 siblings, 1 reply; 3+ messages in thread
From: Hans de Goede @ 2009-08-15 9:05 UTC (permalink / raw)
To: Németh Márton; +Cc: Jean-François Moine, linux-media
On 08/15/2009 08:53 AM, Németh Márton wrote:
> Hello Hans,
>
> I am using your libv4l 0.6.0 [1] together with the driver gspca_pac7311
> from Linux kernel 2.6.31-rc4 and with Labtec Webcam 2200 hardware [2]. I
> am using the svv.c [3] to display the webcam image.
>
> When I'm using the webcam in 640x480 the image is displayed correctly.
> However, when I set the resolution to 320x240, the image is not correct:
> the image contains horizontal lines and doubled vertically. I guess the
> conversion from 640x480 is not done just the pixels are shown as it would
> be 320x240.
>
Hi,
This is a known problem in 0.6.0 fixed by this commit:
http://linuxtv.org/hg/~hgoede/libv4l/rev/89fba654c7ea
You can get a snapshot of what will eventually
(soonish) become 0.6.1 here:
http://people.atrpms.net/~hdegoede/libv4l-0.6.1-test.tar.gz
Upgrading to this should fix your problems.
Regards,
Hans
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: libv4l: problem with 2x downscaling + Labtec Webcam 2200
2009-08-15 9:05 ` Hans de Goede
@ 2009-08-16 5:25 ` Németh Márton
0 siblings, 0 replies; 3+ messages in thread
From: Németh Márton @ 2009-08-16 5:25 UTC (permalink / raw)
To: Hans de Goede; +Cc: Jean-François Moine, linux-media
Hello Hans,
Hans de Goede wrote:
> On 08/15/2009 08:53 AM, Németh Márton wrote:
>> I am using your libv4l 0.6.0 [1] together with the driver gspca_pac7311
>> from Linux kernel 2.6.31-rc4 and with Labtec Webcam 2200 hardware [2]. I
>> am using the svv.c [3] to display the webcam image.
>>
>> When I'm using the webcam in 640x480 the image is displayed correctly.
>> However, when I set the resolution to 320x240, the image is not correct:
>> the image contains horizontal lines and doubled vertically. I guess the
>> conversion from 640x480 is not done just the pixels are shown as it would
>> be 320x240.
>
> This is a known problem in 0.6.0 fixed by this commit:
> http://linuxtv.org/hg/~hgoede/libv4l/rev/89fba654c7ea
>
> You can get a snapshot of what will eventually
> (soonish) become 0.6.1 here:
> http://people.atrpms.net/~hdegoede/libv4l-0.6.1-test.tar.gz
>
> Upgrading to this should fix your problems.
Thanks, the libv4l 0.6.1-test fixed the problem for me.
Regards,
Márton Németh
^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-08-15 6:53 libv4l: problem with 2x downscaling + Labtec Webcam 2200 Németh Márton
2009-08-15 9:05 ` Hans de Goede
2009-08-16 5:25 ` Németh Márton
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