[FFmpeg-user] Can ffmpeg convert these mp4 to that mp4?

Carl Eugen Hoyos ceffmpeg at gmail.com
Wed Oct 30 12:47:45 EET 2019

> Am 30.10.2019 um 11:27 schrieb Reindl Harald <h.reindl at thelounge.net>:
> Am 30.10.19 um 11:14 schrieb Carl Eugen Hoyos:
>>> Am 30.10.2019 um 10:48 schrieb arthur brogard via ffmpeg-user <ffmpeg-user at ffmpeg.org>:
>>> ffmpeg -y -r 25 -i infile.mp4 outfile.mp4
>> This will almost certainly lead to A/V desync (if not, then only because of a bug).
> why?

Forcing the video speed will lead to A/V desync unless the input is video-only, the input has already the chosen speed or there is a bug in the transcoding application.
Since changing the video speed with the input option r is a very hacking approach in FFmpeg, it does not always work.

Carl Eugen

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