[gst-devel] Trying to use Gstreamer with a dummy v4l device to use a dv1394src as a v4l webcam

[Stefan Kost]

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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