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FFMPEG Command to Increase or Decrease Speed of Audio File ...
https://codingshiksha.com/tutorials/ffmpeg-command-to-increase-or-decrease-speed-of-audio-file-using-atempo-filter-in-windows-10-full-tutorial-for-beginners/#:~:text=To%20double%20the%20speed%20of%20audio%3A%20ffmpeg%20-i,up%20to%20no%20more%20than%20double%20the%20input%29.
FFMPEG Command to Increase or Decrease Speed of Audio File ...
https://codingshiksha.com/tutorials/ffmpeg-command-to-increase-or-decrease-speed-of-audio-file-using-atempo-filter-in-windows-10-full-tutorial-for-beginners/
You can speed up or slow down audio with the atempo audio filter. To double the speed of audio: ffmpeg -i input.mkv -filter:a "atempo=2.0" -vn output.mkv The atempo filter is limited to using values between 0.5 and 2.0 (so it can slow it down to no less than half the original speed, and speed up to no more than double the input).
How to speed up / slow down a video – FFmpeg
https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video
You can speed up or slow down audio with the atempo audio filter. To double the speed of audio: ffmpeg -i input.mkv -filter:a "atempo=2.0" -vn output.mkv The atempo filter is limited to using values between 0.5 and 2.0 (so it can slow it down to no less than half the original speed, and speed up to no more than double the input).
ffmpeg - How to speed up sound and video and modify …
https://stackoverflow.com/questions/63228235/how-to-speed-up-sound-and-video-and-modify-the-pitch
Combined command: ffmpeg -i input.mkv -filter_complex " [0:v]setpts=0.94*PTS [v]; [0:a]atempo=1.06,asetrate=44100*1.25 [a]" -map " [v]" -map " [a]" output.mkv. Although I assume you want to reset the audio sample rate from 55125 back to 44100:
Modify Video Speed with ffmpeg - David Walsh Blog
https://davidwalsh.name/video-speed
If you care to sync the audio speed with the video speed, things get a bit more complicated: ffmpeg -i input.mp4 -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" output.mp4. More confusing is that the atempo setting seems to require reverse logic to setpts ; i.e. doubling speed seems to require a different multiple.
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