[vlc] Re: changing transcode parameters on-the-fly

[Jean-Paul Saman]

Gun Akkor wrote:
> Hello,
> 
> I am starting VLC with the following command line on a Linux machine:
> 
> vlc v4l:// :v4l-vdev="/dev/video0" :v4l-adev="/dev/dsp" :v4l-norm=1 
> --sout '#transcode{vcodec=h264, venc=x264{tolerance=0.05, analyse=fast, 
> qp=26, me=hex}, acodec=mpga, ab=32, deinterlace=blend, vb=32, 
> height=144, width=176, fps=12}:duplicate{dst=std{access=udp, mux=ts, 
> dst=192.168.200.1:1235}}' -I dummy --extraintf rc --rc-unix 
> "/tmp/video0.vty" > /tmp/video0.log 2>&1 &
> 
> which allows me to capture video, transcode it using the x264 library 
> and to stream it UDP to a local subnet while keeping a rc unix-socket 
> interface open. This part works perfectly. What I would like to ask to 
> the list is whether there is a way to change any of the transcoding 
> parameters on-the-fly without using a graphical interface, and without 
> stopping/re-starting the current VLC interface. It is possible to adjust 
> the size or fps parameters of the vcodec for the running stream?
> 
> Any suggestion is greatly appreciated.

This is not possible at the moment and would require to change 
modules/stream_out/transcode.c and its interface to ffmpeg. Provided 
that ffmpeg's avformat implementation allows for these kind of changes 
when the encoding chain has been setup.

> Regards,
> 
> GA
> 
> Gun Akkor, Ph.D.
> Engineering Department
> Patton Electronics, Co.
> Gaithersburg, MD 20879
> (301) 975-1000
> gakkor AT patton DOT com
> 

Gtz,
Jean-Paul Saman.

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