[FFmpeg-user] How would you record a single window's video and, audio on Linux?

[Lou]

On Wed, 6 Jul 2016 23:01:27 -0400
John Lewis <oflameo2 at gmail.com> wrote:

> Could I feed new coordinates in an existing ffmpeg process and cause it
> to record that frame instead of the old one?

If I understand you correctly you could record the whole screen and use
crop filter to set the recorded area. Change crop x,y with zmq filter.
No idea if it will work but maybe worth a try.

http://ffmpeg.org/ffmpeg-filters.html#zmq_002c-azmq