'how can I slow down a video (I lower pitch by a semitone) with FFMPEG?
I have an old black and white film with audio that was recorded on a phonograph and the playback speed of the audio is a semi-tone higher than it should be. How can I process this video with ffmpeg and slow down BOTH the video and audio together, bringing the audio down a half step (semi-tone) while keeping the video in sync?
I have tried filters like asetrate, setpts, atempo, etc and although I could change the pitch of the audio, the video became badly out of sync with the audio.
Solution 1:[1]
ffmpeg -i input.mp4 -filter:v "setpts=0.5*PTS" -an output.mp4
0.5 is the ratio
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
| Solution | Source |
|---|---|
| Solution 1 | Seb |