[FFmpeg-user] video's audio question

[JD]

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
well, 4700 produced no change in the pitch nor speed. :(
Trying 4600 now.