ffmpeg change speed
ffmpeg -i input.mkv -filter:v "setpts=PTS/60" output.mkv ... var speed= 60 ; // change 60 to whatever speed you want var k=speed, audio=""; while (2 < k) k /= 2, ... , You can use complex filters ffmpeg -i input.mkv -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" output.mkv.
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 ffmpeg change speed 相關參考資料
FFmpeg video speed-up & slow down - 2020 - BogoToBogo
We're going to use pts (presentation time stamps) to speed-up our video of a factor 4: ffmpeg -i TheGoodTheBadAndTheUgly.mp4 -vf "setpts=0.25*PTS" ... https://www.bogotobogo.com How do I speed up a video by 60X in ffmpeg? - Super User
ffmpeg -i input.mkv -filter:v "setpts=PTS/60" output.mkv ... var speed= 60 ; // change 60 to whatever speed you want var k=speed, audio=""; while (2 < k) k /= 2, ... https://superuser.com How to change video speed by ffmpeg? - Stack Overflow
You can use complex filters ffmpeg -i input.mkv -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]" output.mkv. https://stackoverflow.com How to increase video's FPS and speed correctly with ffmpeg ...
The order should be reversed, ffmpeg -i in -filter:v "setpts=PTS/6,fps=30" out. With the fps filter first, ffmpeg will insert 25 duplicate frames each ... https://superuser.com How to speed up slow down a video – FFmpeg
https://trac.ffmpeg.org Modify Video Speed with ffmpeg - David Walsh Blog
Change the speed and rate of a video (mpeg, mp4, webm) with ffmpeg. https://davidwalsh.name Speed up video x1.5 but keep all frames - Super User
When changing the video speed, you usually do not have to set -r , but just let ffmpeg change the timestamps of the frames. This might lead to ... https://superuser.com What's right way to change playback speed with ffmpeg ...
If your file contains standard PTS reference information, I think the best way to change back playback speed will be using the setpts filter. The filter works in FFmpeg as well. ffplay [INPUT] -vf se... https://stackoverflow.com |