Use the "atempo" filter:
ffmpeg -i input.mp4 -filter:a "atempo=0.5" -vn output.aac
The above example will extract the audio stream from the input video, slow it down by 2 and reencode it into an AAC audio file.
The parameter for atempo must be between 0.5 and 2.0. If you want to slow it down even more, you can use the atempo filter more than once.
Eg. to slow it down by 4:
ffmpeg -i input.mp4 -filter:a "atempo=0.5,atempo=0.5" -vn output.aac
Recent comments
2 years 24 weeks ago
3 years 45 weeks ago
3 years 45 weeks ago
3 years 47 weeks ago
3 years 48 weeks ago
4 years 3 weeks ago
4 years 3 weeks ago
4 years 3 weeks ago
4 years 3 weeks ago
4 years 3 weeks ago