[FFmpeg-user] Dropping 1 frame every n seconds

Steve steve at aatw.com
Sun May 31 11:46:18 CEST 2015

I would like to try and test changing the tempo of the audio in a video without losing sync and without having to blend or merge frames.

At 25fps, dropping 1 frame would allow the the audio to be pitched/time stretched by 4% and dropping 1 frame every 2 seconds would allow for 2%

I understand how to modify the audio with atempo but am not sure of the best method to drop one frame every second or every other second - is it possible with a standard filter command?

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