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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
Nicolas Martel
Posted 2014-08-26T23:31:49.270
Reputation: 141
1
-q 1seemed to have done it but there is still a little bit of compression visible – Nicolas Martel – 2014-08-27T16:09:22.553Please include the complete
ffmpegconsole output from at least one of your commands. – llogan – 2014-08-27T16:29:40.020Cannot 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 – 2014-08-29T19:49:34.320