My question is why am I seeing these inconsistencies and how can I approach this in a reliable way that will work for all videos.įull command: ffmpeg -ss 0 -t 100 -i './input.mov' -map V:0 -c:v libx264 -vf scale=-2:240 out.mp4 it'll output videos of precisely 100 seconds and 2997 frames which solves the problem. I noticed that for those problematic videos if I use ffmpeg -ss 0 -t 99.999 and ffmpeg -ss 99.999 -t 99.999 etc. The issue is that this results with segments that have overlapping frames and when I stitch the segments back together I have a video that is longer than its source and will be out of sync with the audio. ffmpeg -ss 100 -t 100) it will output a video with a duration of 100. I've noticed that for some video sources with a (constant) frame-rate of 29.97 it'll output a video with a duration of 100.0 frames instead of the expected 1.

To account for videos that have a framerate of 29.97 I cut them into 100-second videos via ffmpeg -ss 0 -t 100 which works well for the most part and outputs videos that have a duration of 100 seconds and 2997 frames.

I want to cut a video into many segments and then stitch them back together.

Ffmpeg copy frame size