[FFmpeg-user] Combining 24fps Video with 23.976fps Audio

Sam Logan shapableline at gmail.com
Tue Sep 24 09:49:00 CEST 2013

On 9/21/13, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> The filters allow you to specify the stream they should
> work on, please see the filter documentation.

Ah, yes, okay, I didn't realize that was possible. I found the
:a:[strm] syntax in the documentation, and with it was able to
reencode the audio to sync up by using the asetpts and atempo filters.

On 9/20/13, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
>> The atempo and the setpts filter should allow you to change
>> the speed of the files:
>> http://ffmpeg.org/ffmpeg-filters.html#setpts_002c-asetpts
>> http://ffmpeg.org/ffmpeg-filters.html#atempo

One more question on this topic: would it also be possible to also
change audio speed with

-filter:a aresample

I ask because the documentation at
http://ffmpeg.org/ffmpeg-filters.html#aresample-1 says "This filter is
also able to stretch/squeeze the audio data", which seems like the
same thing. But there are no examples either there or at
http://ffmpeg.org/ffmpeg-resampler.html on what exact arguments must
be used to do this. Basically, I'm asking, is it possible to duplicate
the effect of...




...using aresample, and if so, what exactly are the arguments to be used?

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