[FFmpeg-user] How to drop every Nth frame?

Pavel Koshevoy pkoshevoy at gmail.com
Sat Sep 28 09:44:55 CEST 2013

On 9/28/2013 1:15 AM, Andrey Aleksandrovich wrote:
>>>> This interested me because I am trying inverse telecine on 30 fps source
>>>> (I normally work on 60 fps telecined 1080i sources). This was Carl Eugen's
>>>> first reply to the discussion:
> My situation is that I need to sync a-v (expanding desync, 0 at start
> and 14 sec at the end).
> The audio filter 'atempo' doesn't help because it accepts only 3
> numbers after coma (0.XXX). In my case it's limits are: 0.998 (-3.3

What makes you think that atempo limits the scale factor precision to 
only 4 significant digits?  Have you tried providing a more precise 
scale factor?


> sec desync at the end) and 0.997 (+7.3 sec desync at the end).
> So I think I can make it by contraction of video (dropping frames with
> changing duration).
> Maybe you can suggest another way...
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