mixing datapath framegrabber with composite input

[Mikael Kermorgant]

Hello,

I'm trying to mix two videos captured from /dev/video0 and /dev/video1 into
one, on an old ubuntu 12.04.
I have successfully mixed videotestsrc sources, one videtestsrc with one
from /dev/videoN

But when I try to combine /dev/video0 and /dev/video1, it fails.

Here's the pipeline :

gst-launch-0.10  -v \
        v4l2src device=/dev/video0 ! video/x-raw-rgb ! videoscale !
video/x-raw-rgb,width=320,height=180 ! ffmpegcolorspace ! \
        videomixer name=mix ! \
        x264enc tune=zerolatency byte-stream=true bitrate=2048 ! queue !
filesink location="/tmp/pipcamera.avi" \
        v4l2src device=/dev/dada0 ! video/x-raw-yuv,
width=1280,height=1024, framerate=10/1 !  videoscale ! video/x-raw-yuv,
format=\(fourcc\)YUY2, width=320,height=180 ! ffmpegcolorspace ! videobox
border-alpha=1.0 top=0  left=-320 ! mix.

Main error is :

ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal
data flow error.
streaming task paused, reason not-negotiated (-4)

Full output is here : http://ur1.ca/ms1uh

Would you have any idea about what's wrong  ?
Best regards

-- 
Mikael Kermorgant
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