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I made a timelapse out of an image sequence using ffmpeg and the copy codec to disable compression and keep the quality to a max. The timelapse is a bit too long (10 minutes and up) so I tried to use this command to speed it up

ffmpeg -i timelapse.avi -filter:v "setpts=0.3*PTS" timelapse_fast.avi

Unfortunately, the quality became that of an online video in 1995. I then tried this

ffmpeg -i timelapse.avi -filter:v "setpts=0.3*PTS" -vcodec copy timelapse_fast.avi

It worked but disabled the setpts filter, so the video was not sped up

I also tried the following

ffmpeg -i timelapse.avi -filter:v "setpts=0.3*PTS" -crf 1 timelapse_fast.avi

To no avail

Any idea? thanks

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  • 2
    -q 1 seemed to have done it but there is still a little bit of compression visible
    – Nicolas Martel
    Aug 27, 2014 at 16:09
  • Please include the complete ffmpeg console output from at least one of your commands.
    – llogan
    Aug 27, 2014 at 16:29
  • Cannot copy and filter at the same time. I'd be curious if changing -q to 0 does anything for you. The filter documentation seems to imply that there is a way to modify frame info without changing the frame content.
    – dstob
    Aug 29, 2014 at 19:49
  • Maybe you could extract every other frame (2x speed), speed up the audio by 2x, then combine the extracted images (use PNGs) and audio track into one video.
    – Rublacava
    Jul 2, 2020 at 10:10

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