Error using v4l2sink when combining 2 camera streams

[Jim Ruxton]

Thanks so much for this. Your pipeline worked when I substituted a 
v4l2src for the videotestsrc. Much appreciated.

Jim

On 2021-02-17 6:16 p.m., gotsring wrote:
> Assuming you're using v4l2loopback to create the loopback device, there seems
> to be a hack to get this to work on the more recent GStreamer releases. Just
> add identity drop-allocation=1 to the pipeline.
>
> Example of using loopback (video1) using test sources:
> gst-launch-1.0 videotestsrc ! video/x-raw, format=YUY2, framerate=30/1,
> width=640, height=480 ! \
> alpha alpha=1 ! videobox border-alpha=0 left=-640 ! compositor  name=Mix ! \
> videoconvert ! video/x-raw, format=YUY2 ! identity drop-allocation=1 !
> v4l2sink device=/dev/video1  \
> videotestsrc pattern=ball ! video/x-raw, format=YUY2, framerate=30/1,
> width=640, height=480 ! \
> alpha alpha=1 ! videobox border-alpha=0 right=-640 ! Mix.
>
>
> Solution gotten from the bottom of this page:
> https://github.com/umlaeute/v4l2loopback/wiki/GStreamer
>
> I typically use udpsink to send videos over network loopback, and then I can
> play the videos as a network source on something like VLC. Probably not
> great, but I've had no problems so far!
>
>
>
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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