Stream Synchronized Webcams

[Nicolas Dufresne]

Le 8 nov. 2016 2:05 AM, "Eric-Stone" <somedude114 at gmail.com> a écrit :
>
> Hi,
>
> I'm trying to stream two synchronized side-by-side webcams compressed in
> h264 over the network. Right now, I have the output saved to a file
(because
> it simplifies testing) using the command:
>
> gst-launch-1.0 \
>         v4l2src device=/dev/video0 do-timestamp=true ! \
>         image/jpeg, width=$WIDTH, height=$HEIGHT, framerate=$FPS/1 ! \
>         jpegparse ! jpegdec ! \
>         videorate ! \
>         alpha alpha=1.0 ! \
>         videobox border-alpha=0 left=-$WIDTH ! \
>         videomixer name=mix ! \
>         videoconvert ! \
>         queue ! \
>         queue ! omxh264enc ! matroskamux ! filesink
location=output/out.mkv  \
>         $v4l2src device=/dev/video1 do-timestamp=true ! \
>         image/jpeg, width=$WIDTH, height=$HEIGHT, framerate=$FPS/1 ! \
>         jpegparse ! jpegdec ! \
>         videorate ! \
>         queue ! \
>         mix.
>
> This works, but unfortunately the two views are out of sync. I imagine
that
> I need to add "sync=true" to some element before the encoder, but I'm
unsure
> as where that should go. Does anyone have any suggestions on how to
> synchronize these two inputs?
>

First avoid do-timestamp, this will break a/v sync. Then replace videomixer
with the new element compositor. The new one supports live streams. It's a
drop-in replacement. You should probably use the compositor pad properties
instead of videobox, performance will be better.

>
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