Framerate conversion

It is possible to convert a video with framerate X to a video with framerate Y. There are 2 methods: conform = the total number of frames remains the same, they are just played slower or faster to accommodate the new framerate. interpolate = the total duration of the video remains the same, but frames are added or dropped to match the new framerate.

Input duration

Seconds
1 frames
0.02 sec(s)
  • Framerate stays 60 - so nothing to do for conversion

Explanation

  • Calculate # frames from time duration and vice versa. e.g. 93 sec @ 24fps = 2232 frames
  • Calculate how audio and video should be manipulated to change from one framerate to another, using sox and/or ffmpeg
  • When is this necessary? If you have a video that was recorded in 25fps(PAL) or 30fps(NTSC), and you want to show it on a cinema screen: you have to convert the framerate to 24 fps.