FFMEG multiple frames extraction

Question

I need a command (if there is any) that will allow me to extract frames at different time offsets. Currently I'm able to extract them one by one using ss command.

Example of current command:

C:\ffmpeg\bin\ffmpeg.exe -i %1 -ss %2  -vframes 1 -s %3x%4 -f image2 %5 -hide_banner -loglevel panic

This works very slowly on large number of time offsets.

Answer 1

Put the -ss option before the -i option to get ffmpeg to seek to the nearest keyframe and decode from there, rather than decoding from the beginning of the file each time.