[FFmpeg-user] Assumefps() equivalent in FFMPEG

Simon Thelen ffmpeg-user at c-14.de
Wed Jul 30 15:18:32 CEST 2014

On 30/07/14 at 08:13, Reuben Martin wrote:
> On Wednesday, July 30, 2014 07:02:49 AM Eugene Gekhter wrote:
> > In my avisynth workflow, I stretch the audio to 36% of its original rate to
> > get it to play at the right speed and with perfect sync with the video,
> > something like video.*assumefps(*18*)*.*TimeStretch(*rate=36*).*
> In ffmpeg you would normally use a filter called "atempo".  However, this much 
> stretching is beyond the range on what it can handle. (it's range is 0.5 - 
> 2.0)
You can always use  2 atempo filters, one at 0.5 and another at 0.72,
that should slow it down to 36% of the original rate.
(assuming my math is correct)
Simon Thelen
A rolling stone gathers momentum.

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