[FFmpeg-user] Sending 2 camera outputs side by side to loopback device

[Jim Ruxton]

Thanks for the reply. I just rebooted my computer and tried again. There
must have been some locked up process that wasn't allowing me to see the
loopback device as it now works.

On Fri, Nov 25, 2022 at 2:56 AM Michael Koch <astroelectronic at t-online.de>
wrote:

> Am 25.11.2022 um 08:02 schrieb Jim Ruxton:
> > I am on Ubuntu 22.04 and trying to combine 2 cameras into one stream that
> > is being sent to a loopback device. The command appears to work but I
> can't
> > see the stream in any way. I've tried VLC Cheese ffplay guvcview and none
> > of them work. The command I am using is
> > :
> > *ffmpeg -f v4l2 -vcodec rawvideo -i /dev/video0 -f v4l2 -vcodec rawvideo
> -i
> > /dev/video2 -filter_complex hstack,"scale=iw*.5:ih*1" -f v4l2 -vcodec
> mjpeg
> > /dev/video4 *
>
> It seems you forgot to specify an output file or pipe at the end of the
> command line.
>
> Michael
>
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