[FFmpeg-user] Problem with changing options at runtime with a command

[Michael Koch]

Hi Gyan,

>
> As the docs state, the acceptable commands are w, h, x, ,y
>
> so the syntax is
>
>     c crop -1 w 100
>

Is this documented somewhere? I mean typing "c" in the console while 
FFmpeg is running.
I know that you mentioned it on stackoverflow some time ago, but I never 
found it in the FFmpeg docs.

https://stackoverflow.com/questions/56058909/ffmpeg-drawtext-and-live-coordinates-with-sendcmd-zmq

I think it should be added to chapter 34 in FFmpeg-all.html, "Changing 
options at runtime with a command".

Michael