[FFmpeg-user] Conform framerate with ffmpeg

[Reuben Martin]

On Friday, May 15, 2015 02:42:06 PM Carl Eugen Hoyos wrote:
> Carles Vila <cvilad <at> gmail.com> writes:
> > 2. Is there a way to conform a ProRes file
> > directly with ffmpeg? All audio channels playback
> > sample rate should also be modified accordingly.
> 
> How is that possible without transcoding?
> 
Just a guess, it might have a flag set somewhere to indicate pull up or pull 
down for the audio sampling rate. It is common to skew the clock rates to 
achieve frame rate changes.

+/- 0.4% for going between 24 and 25 fps.
+/- 0.1% for changing between 1000 and 1001 frame base.

See the front panel of this sync generator under the audio sample rate 
settings as an example:
http://www.rosendahl-studiotechnik.de/nanosyncs.html

-Reuben