[FFmpeg-user] overlay audio channels

[Clément Bœsch]

On Fri, Aug 03, 2012 at 03:44:23PM -0400, Kosta Vlotis wrote:
> On Fri, Aug 3, 2012 at 3:40 PM, Clément Bœsch <ubitux at gmail.com> wrote:
> > On Fri, Aug 03, 2012 at 03:37:37PM -0400, Kosta Vlotis wrote:
> >> On Fri, Aug 3, 2012 at 3:29 PM, Nicolas George
> >> <nicolas.george at normalesup.org> wrote:
> >> > 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
> >> > c0<c0+c1.
> >> >
> >> >> this isnt working
> >> >
> >> > Define this.
> >> >
> >> > Regards,
> >> >
> >> > --
> >> >   Nicolas George
> >> >
> >> > -----BEGIN PGP SIGNATURE-----
> >> > Version: GnuPG v1.4.12 (GNU/Linux)
> >> >
> >> > iEYEARECAAYFAlAcJo4ACgkQsGPZlzblTJPJpACZAZZpYtK+vP/Tu+tSXrbEJFAB
> >> > 7GIAn0cyhc2DO1jpUCNe8kma20H9mkSn
> >> > =gMSg
> >> > -----END PGP SIGNATURE-----
> >> >
> >> > _______________________________________________
> >> > ffmpeg-user mailing list
> >> > ffmpeg-user at ffmpeg.org
> >> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >> >
> >>
> >> this command:
> >> W:\Brazstore-1\KOSTA NEW W\SOURCE\ENCODING TESTS>ffmpeg -async 1 -i
> >> video.mpeg -f mp4 -c:v libx264 -preset slow -g 60 -b:v 1000k -s
> >> 854x480 -aspect 16:9 -vf pan="stereo: c0<c1+c0 : c1<c0+c1" -c:a
> >> libvo_aacenc -b:a 128k -ar 48000 -threads 0 -y audiotes1_pan.mp4
> >>
> >> returns this error:
> >> [scale @ 040c0e80] Media type mismatch between the '(null)' filter output pad 0
> >> and the 'Parsed_pan_0' filter input pad 0
> >> Cannot create the link scale:0 -> pan:0
> >> Error opening filters!
> >
> > "Media type mismatch". -vf stands for video filter as Nicolas said. You
> > should try to guess the equivalent for audio filter.
> >
> > Also, please consider pasting the full FFmpeg output if that still doesn't
> > work.
> >
> > --
> > Clément B.
> >
> > _______________________________________________
> > ffmpeg-user mailing list
> > ffmpeg-user at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >
> 
> any idea what the equicalent for audio is? i tried -af and i get this:
> Unrecognized option 'af'
> Failed to set value 'pan=stereo: c0<c1+c0 : c1<c0+c1' for option 'af'

You guessed well the option name. But it looks like you don't have a
FFmpeg recent enough. Unfortunately without the full output no one can
tell.

-- 
Clément B.
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