For a one hour dash cam video in normal speed, is it possible to create a smooth timelapse video from it?
Most tutorials online I found about "timelapse + ffmpeg" are with static jpeg files combined into a timelapse video. These often result jiggle between frames, are the any specific parameters which would make the video looking very smooth & stable?
Should I just setpts=0.5*PTS for the trick? Any must-have or little-known tricks?
Update: this question is asking for specific programmable ffmpeg parameters.
Yes, that's the way specified in the ffmpeg wiki: How to speed up / slow down a video.
ffmpeg -i input.mkv -filter:v "setpts=0.5*PTS" output.mkv
setpts also supports expressions if you feel creative and want to speed up/ slow down based on a curve rather than a constant value.
Eg: -filter:v "setpts=gauss(T/100)*PTS"