[FFmpeg-user] Assumefps() equivalent in FFMPEG

[Eugene Gekhter]

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*).*


*Eugene Gekhter* / CEO

(847) 272-8207/ egekhter at pixcel.com
*Pixcel* Office: (800) 557-3508
3336 Commercial Ave. / Northbrook, IL 60062
http://www.pixcel.com






On Tue, Jul 29, 2014 at 8:22 PM, Reuben Martin <reuben.m at gmail.com> wrote:

> On Tuesday, July 29, 2014 07:35:54 PM Eugene Gekhter wrote:
> > Thanks for responding.
> > The use case is super 8mm film, which has a native frame-rate of 18 fps
> > (typically). The high speed scanner scans 50 unique frames per second,
> but
> > ultimately the frames need to playback at 18 fps. Audio exists 30% of the
> > time.
>
> Oh, I see. Well that's quite different. Does the audio even need to be
> slowed
> down then, or is it sampled at a faster rate also? If not, you might be
> able
> to use copy-stream on the audio.
>
> The slowmovideo software could also smoothly interpolate the video into a
> more
> standard frame-rate if you needed that.
>
> -Reuben
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