[FFmpeg-user] overlay audio channels

[Kosta Vlotis]

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-----
>> >
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>> >
>>
>> 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.
>
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>

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'