I have a folder of frames (saved as jpg) extracted from a 240 FPS video. What I’d like to do is create a new video at 30 FPS (i.e. sampling only every 8th frame - since 240/30=8).
I have tried the following command:
ffmpeg -i %05d.jpg "select='mod(n,8)’” -r 30 output.mp4
However, the video does not look correct (in fact when I ffprobe, the resulting video does not have the correct number of frames).
I can’t work out what I’m doing wrong. Does anyone have any suggestions?