[FFmpeg-user] video's audio question

JD jd1008 at gmail.com
Fri Jan 27 20:27:14 EET 2017

On 01/27/2017 11:11 AM, Moritz Barsnick wrote:
> 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
>> right?
> The asetrate filter is designed for that:
> https://ffmpeg.org/ffmpeg-filters.html#asetrate
> 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,
> Moritz
Thanx Moritz. Will try it.

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