[FFmpeg-user] overlay audio channels

Nicolas George nicolas.george at normalesup.org
Fri Aug 3 21:29:18 CEST 2012

Le septidi 17 thermidor, an CCXX, Kosta Vlotis a écrit :
> i'm not sure i understand the docs.. this is what i have so far:
> ffmpeg -async 1 -i b.mpeg -f mp4 -c:v libx264 -preset slow -g 60 -b:v
> 1000k -s 854x480 -aspect 16:9 -vf "pan=stereo: c0=c0+c1 : c1=c0+c1"
> -c:a libvo_aacenc -b:a 128k -ar 48000 -ac 1 -threads 0 -y
> audiotes1_pan.mp4

pan is not a *v*ideo *f*ilter.

And you should be dividing by 2 to avoid overflows: c0=0.5*c0+0.5*c1 or

> this isnt working

Define this.


  Nicolas George
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