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  • Android ffmpeg command not working for pitch & tempo change

    15 juillet 2019, par Hardip

    I’m trying to use below command to change pitch & tempo in my existing mp4 file, can anybody help me to correct ffmpeg command.

    ffmpeg [-y,-i,/storage/9016-4EF8/abcd video.mp4,-af,asetrate=r=46722.3224612449211671764955071340,-filter_complex,[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a],-map,[v],-map,[a],-vcodec,mpeg4,/storage/emulated/0/cut_video.mp4]

  • How to change pitch and tempo together, reliably with ffmpeg

    12 novembre 2016, par jake

    I know how to change tempo with atempo, but the audio file becomes distorted a bit, and I can’t find a reliable way to change pitch. (say, increase tempo and pitch together 140%)

    Sox has a speed option, but truncates the volume AND isn’t as widely available as ffmpeg. mplayer has a speed option which works perfectly, but I can’t output without additional libraries.

    I seem to understand ffmpeg doesn’t have a way to change pitch (maybe it does recently ?) but is there a way to change frequency or some other flags to emulate changing pitch ? Looked quite far and can’t find a decent solution.

    Edit : asetrate:48k*1.4 (assuming originally 48k) doesn’t seem to work, still distortion and pitch doesn’t really change much.

    Edit2 : http://superuser.com/a/1076762 this answer sort of works, but the quality is so much lower than sox speed 1.4 option

  • Audio going out of sync when using setpts and tempo in ffmpeg

    30 mai 2019, par loveforfire33

    I am trying to slow down a video and its audio at the same time (mp4). I have tried doing the audio and video separately with code similar to the command below, but still get the same effect.

    The audio slowly goes out of sync with the video after roughly 30 seconds (audio goes faster).

    -i "INPUT" -filter_complex "[0:v]setpts=1.1*PTS[v] ;[0:a]atempo=0.9[a]" -map "[v]" -map "[a]" "OUTPUT"

    Any advice would be appreciated. Thanks in advance.

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