* gstreamer and v4l2
@ 2016-03-15 7:10 Ran Shalit
2016-03-15 7:18 ` Hans Verkuil
2016-03-15 10:28 ` Antonio Ospite
0 siblings, 2 replies; 5+ messages in thread
From: Ran Shalit @ 2016-03-15 7:10 UTC (permalink / raw)
To: linux-media
Hello,
This is a bit offtopic, so I will understand if you rather not discuss that...
I am trying to use gstreamer with v4l2 vivi device,
I first check the capabilities with
gst-launch-1.0 --gst-debug=v4l2src:5 v4l2src device="/dev/video0" !
fakesink 2>&1
and it gives many capabilities such as the following:
video/x-raw-yuv, format=(string)YUY2, framerate=(fraction)[1/1000,
1000/1], width=(int) 640, height=(int)180, interlaced=(boolean)true
So I tried to run as following:
gst-launch-0.10 v4l2src device="/dev/video0" !
video/x-raw,width=640,height=180,framerate=30 ! autovideosink
But it keeps giving me auto negotiation error -4.
Trying to give other values did not help neither.
It is probaby more a gstreamer issue, but if someone is familiar and
can shed some light on this will will help.
Linux version is 3.10.0.
Regards,
Ran
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: gstreamer and v4l2
2016-03-15 7:10 gstreamer and v4l2 Ran Shalit
@ 2016-03-15 7:18 ` Hans Verkuil
2016-03-15 7:22 ` Ran Shalit
2016-03-15 10:28 ` Antonio Ospite
1 sibling, 1 reply; 5+ messages in thread
From: Hans Verkuil @ 2016-03-15 7:18 UTC (permalink / raw)
To: Ran Shalit, linux-media
On 03/15/2016 08:10 AM, Ran Shalit wrote:
> Hello,
>
> This is a bit offtopic, so I will understand if you rather not discuss that...
>
> I am trying to use gstreamer with v4l2 vivi device,
> I first check the capabilities with
>
> gst-launch-1.0 --gst-debug=v4l2src:5 v4l2src device="/dev/video0" !
> fakesink 2>&1
>
> and it gives many capabilities such as the following:
>
> video/x-raw-yuv, format=(string)YUY2, framerate=(fraction)[1/1000,
> 1000/1], width=(int) 640, height=(int)180, interlaced=(boolean)true
>
> So I tried to run as following:
>
> gst-launch-0.10 v4l2src device="/dev/video0" !
> video/x-raw,width=640,height=180,framerate=30 ! autovideosink
>
> But it keeps giving me auto negotiation error -4.
> Trying to give other values did not help neither.
>
> It is probaby more a gstreamer issue, but if someone is familiar and
> can shed some light on this will will help.
Actually, I suspect that vivi is the culprit. It had some non-standard
behavior that might mess up gstreamer. One of the (many) reasons it was
replaced with vivid.
Regards,
Hans
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: gstreamer and v4l2
2016-03-15 7:18 ` Hans Verkuil
@ 2016-03-15 7:22 ` Ran Shalit
0 siblings, 0 replies; 5+ messages in thread
From: Ran Shalit @ 2016-03-15 7:22 UTC (permalink / raw)
To: Hans Verkuil; +Cc: linux-media
On Tue, Mar 15, 2016 at 9:18 AM, Hans Verkuil <hverkuil@xs4all.nl> wrote:
> On 03/15/2016 08:10 AM, Ran Shalit wrote:
>> Hello,
>>
>> This is a bit offtopic, so I will understand if you rather not discuss that...
>>
>> I am trying to use gstreamer with v4l2 vivi device,
>> I first check the capabilities with
>>
>> gst-launch-1.0 --gst-debug=v4l2src:5 v4l2src device="/dev/video0" !
>> fakesink 2>&1
>>
>> and it gives many capabilities such as the following:
>>
>> video/x-raw-yuv, format=(string)YUY2, framerate=(fraction)[1/1000,
>> 1000/1], width=(int) 640, height=(int)180, interlaced=(boolean)true
>>
>> So I tried to run as following:
>>
>> gst-launch-0.10 v4l2src device="/dev/video0" !
>> video/x-raw,width=640,height=180,framerate=30 ! autovideosink
>>
>> But it keeps giving me auto negotiation error -4.
>> Trying to give other values did not help neither.
>>
>> It is probaby more a gstreamer issue, but if someone is familiar and
>> can shed some light on this will will help.
>
> Actually, I suspect that vivi is the culprit. It had some non-standard
> behavior that might mess up gstreamer. One of the (many) reasons it was
> replaced with vivid.
>
> Regards,
>
> Hans
Hi Hans,
Thanks for the quick response.
Well... a minue after posting...
I made another try and just added videoconvert (or ffmpegcolorspace)
before autovideosink, and now it works just fine !
probably the unique size (640x180) from vivi is not supported in
autovideosink, without conversion in between.
So this how it works in my case , if it helps anyone with similar issue:
gst-launch-0.10 v4l2src device="/dev/video0" !
video/x-raw,width=640,height=180,framerate=30 ! ffmpegcolorspace !
autovideosink
Thank you very much,
Ran
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: gstreamer and v4l2
2016-03-15 7:10 gstreamer and v4l2 Ran Shalit
2016-03-15 7:18 ` Hans Verkuil
@ 2016-03-15 10:28 ` Antonio Ospite
2016-03-15 11:05 ` Vladimir Zapolskiy
1 sibling, 1 reply; 5+ messages in thread
From: Antonio Ospite @ 2016-03-15 10:28 UTC (permalink / raw)
To: Ran Shalit; +Cc: linux-media
On Tue, 15 Mar 2016 09:10:59 +0200
Ran Shalit <ranshalit@gmail.com> wrote:
> Hello,
>
> This is a bit offtopic, so I will understand if you rather not discuss that...
>
> I am trying to use gstreamer with v4l2 vivi device,
> I first check the capabilities with
>
> gst-launch-1.0 --gst-debug=v4l2src:5 v4l2src device="/dev/video0" !
> fakesink 2>&1
>
> and it gives many capabilities such as the following:
>
> video/x-raw-yuv, format=(string)YUY2, framerate=(fraction)[1/1000,
> 1000/1], width=(int) 640, height=(int)180, interlaced=(boolean)true
>
A cleaner way to enumerate capabilities of a video device in GStreamer
is like that:
gst-device-monitor-1.0 Video
on Debian distributions gst-device-monitor-1.0 is in the
gstreamer1.0-plugins-base-apps package.
> So I tried to run as following:
>
> gst-launch-0.10 v4l2src device="/dev/video0" !
> video/x-raw,width=640,height=180,framerate=30 ! autovideosink
>
> But it keeps giving me auto negotiation error -4.
> Trying to give other values did not help neither.
BTW, the need for videoconvert is more likely because of the pixelformat
rather than the frame dimensions.
Ciao ciao,
Antonio
--
Antonio Ospite
http://ao2.it
A: Because it messes up the order in which people normally read text.
See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: gstreamer and v4l2
2016-03-15 10:28 ` Antonio Ospite
@ 2016-03-15 11:05 ` Vladimir Zapolskiy
0 siblings, 0 replies; 5+ messages in thread
From: Vladimir Zapolskiy @ 2016-03-15 11:05 UTC (permalink / raw)
To: Antonio Ospite, Ran Shalit; +Cc: linux-media
On 15.03.2016 12:28, Antonio Ospite wrote:
> On Tue, 15 Mar 2016 09:10:59 +0200
> Ran Shalit <ranshalit@gmail.com> wrote:
>
>> Hello,
>>
>> This is a bit offtopic, so I will understand if you rather not discuss that...
>>
>> I am trying to use gstreamer with v4l2 vivi device,
>> I first check the capabilities with
>>
>> gst-launch-1.0 --gst-debug=v4l2src:5 v4l2src device="/dev/video0" !
>> fakesink 2>&1
>>
>> and it gives many capabilities such as the following:
>>
>> video/x-raw-yuv, format=(string)YUY2, framerate=(fraction)[1/1000,
>> 1000/1], width=(int) 640, height=(int)180, interlaced=(boolean)true
>>
>
> A cleaner way to enumerate capabilities of a video device in GStreamer
> is like that:
>
> gst-device-monitor-1.0 Video
>
> on Debian distributions gst-device-monitor-1.0 is in the
> gstreamer1.0-plugins-base-apps package.
No, you add some redundant GStreamer app instead of using just
GStreamer framework internals, this is not a cleaner way.
>> So I tried to run as following:
>>
>> gst-launch-0.10 v4l2src device="/dev/video0" !
>> video/x-raw,width=640,height=180,framerate=30 ! autovideosink
According to the received caps use
* video/x-raw-yuv
* framerate=30/1
* and start from fakesink
>>
>> But it keeps giving me auto negotiation error -4.
>> Trying to give other values did not help neither.
>
> BTW, the need for videoconvert is more likely because of the pixelformat
> rather than the frame dimensions.
>
--
With best wishes,
Vladimir
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2016-03-15 11:05 UTC | newest]
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2016-03-15 7:10 gstreamer and v4l2 Ran Shalit
2016-03-15 7:18 ` Hans Verkuil
2016-03-15 7:22 ` Ran Shalit
2016-03-15 10:28 ` Antonio Ospite
2016-03-15 11:05 ` Vladimir Zapolskiy
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