[FFmpeg-user] video's audio question
barsnick at gmx.net
Fri Jan 27 20:11:20 EET 2017
On Thu, Jan 26, 2017 at 20:56:48 -0700, JD wrote:
> Have a video in which the audio's pitch (and speed) are just slightly
> higher than normal.
> How can I reduce the pitch and speed in small increments until I get it
The asetrate filter is designed for that:
Unfortunately, it doesn't take the input rate as a variable, but if you
know your input is 48000 Hz, you can do:
$ ffmpeg -i video.mp4 -af asetrate=47000 -c:v copy -c:a aac output.mp4
If the output audio stream needs to be 48000 (or something "standard"
again, you have to resample:
$ ffmpeg -i video.mp4 -af asetrate=47000,aresample=48000 -c:v copy -c:a aac output.mp4
Hope this helps,
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