Trying to use Gstreamer with a dummy v4l device to use a dv1394src as a v4l webcam

[Cillian de Roiste]

Hi,

I'm using gstreamer 0.10.20 and AVLD as a dummy v4l device
(http://allonlinux.free.fr/Projets/AVLD/  version 0.1.4). I don't know
if what I'm trying is really possible but people claim to have used
AVLD successfully for this so I'm hoping I've just got something wrong
in the pipeline I'm using.

modprobe avld palette=9 depth=24 fps=10 width=320 height=240

gst-launch-0.10 dv1394src ! queue ! dvdemux ! ffdec_dvvideo !
videoscale ! ffmpegcolorspace !
video/x-raw-yuv,width=320,height=240,format=\(fourcc\)UYVY ! filesink
location=/dev/video0 buffer-mode=2

# This seems happy enough
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock

# mplayer accepts it and plays the video
mplayer tv:// -tv "driver=v4l:device=/dev/video0:noaudio:outfmt=uyvy"

# When I try to open it with gstreamer (or via gstreamer-properties etc.):
gst-launch-0.10 v4lsrc ! xvimagesink
# it says:
Error running pipeline 'Video for Linux (v4l)': Could not read from
resource. [v4lsrc_calls.c(183): gst_v4lsrc_capture_init ():
/pipeline1/v4lsrc2:
Not enough buffers. We got 1, we want at least 2]

Any ideas?

Thanks,
Cillian

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[Stefan Sauer]

hi,

Cillian de Róiste schrieb:

> Hi,
>
> I'm using gstreamer 0.10.20 and AVLD as a dummy v4l device
> (http://allonlinux.free.fr/Projets/AVLD/  version 0.1.4). I don't know
> if what I'm trying is really possible but people claim to have used
> AVLD successfully for this so I'm hoping I've just got something wrong
> in the pipeline I'm using.
>
> modprobe avld palette=9 depth=24 fps=10 width=320 height=240
>
> gst-launch-0.10 dv1394src ! queue ! dvdemux ! ffdec_dvvideo !
> videoscale ! ffmpegcolorspace !
> video/x-raw-yuv,width=320,height=240,format=\(fourcc\)UYVY ! filesink
> location=/dev/video0 buffer-mode=2
>
> # This seems happy enough
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
>
> # mplayer accepts it and plays the video
> mplayer tv:// -tv "driver=v4l:device=/dev/video0:noaudio:outfmt=uyvy"
>
> # When I try to open it with gstreamer (or via gstreamer-properties etc.):
> gst-launch-0.10 v4lsrc ! xvimagesink
> # it says:
> Error running pipeline 'Video for Linux (v4l)': Could not read from
> resource. [v4lsrc_calls.c(183): gst_v4lsrc_capture_init ():
> /pipeline1/v4lsrc2:
> Not enough buffers. We got 1, we want at least 2]
>  

Can this also do v4l2? v4l is deprected. gstreamer v4l2src has a
queue-size property which you could set to 1. or make a patch to
gstreamers v4lsrc to also have a queue-size property (you can copy the
code almost 1:1 from v4l2src) and hope that this fixes the problem :)

Stefan

> Any ideas?
>
> Thanks,
> Cillian
>
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> Use priority code J9JMT32. http://p.sf.net/sfu/p
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>  

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