working with movie clips from the command line (Mac OSX)

movie_editing_commands.md

Get info on an mp4 file

ffprobe -v quiet -print_format json -show_format -show_streams -print_format json "file.mp4"

convert a MP4 file to a format that MacOSX understands

ffmpeg -i file.mp4 -c:v libx264 -crf 23 -preset medium -c:a copy file_fixed.mp4

create transcript

Use MacWhisper

create ASS file based on SRT transcript

ffmpeg -sub_charenc ISO-8859-1 -i file.srt file.ass

Add subtitles based on transcript ASS file

ffmpeg -i "file.mp4" -vf "ass='file.ass'" -crf 18 -c:a copy "hardsubbed.mp4"

remove certain clips based on timestamps

ffmpeg -i hardsubbed.mp4 -filter_complex " [0:v]trim=start=0.06:end=3.66,setpts=PTS-STARTPTS[v0]; [0:a]atrim=start=0.06:end=3.66,asetpts=PTS-STARTPTS[a0]; [0:v]trim=start=4.41:end=10.02,setpts=PTS-STARTPTS[v1]; [0:a]atrim=start=4.41:end=10.02,asetpts=PTS-STARTPTS[a1]; [0:v]trim=start=11.76:end=22.52,setpts=PTS-STARTPTS[v2]; [0:a]atrim=start=11.76:end=22.52,asetpts=PTS-STARTPTS[a2]; [0:v]trim=start=23.70:end=27.88,setpts=PTS-STARTPTS[v3]; [0:a]atrim=start=23.70:end=27.88,asetpts=PTS-STARTPTS[a3]; [0:v]trim=start=29.42:end=35.52,setpts=PTS-STARTPTS[v4]; [0:a]atrim=start=29.42:end=35.52,asetpts=PTS-STARTPTS[a4]; [0:v]trim=start=36.13:end=53.08,setpts=PTS-STARTPTS[v5]; [0:a]atrim=start=36.13:end=53.08,asetpts=PTS-STARTPTS[a5]; [0:v]trim=start=54.38:end=61.50,setpts=PTS-STARTPTS[v6]; [0:a]atrim=start=54.38:end=61.50,asetpts=PTS-STARTPTS[a6]; [v0][a0][v1][a1][v2][a2][v3][a3][v4][a4][v5][a5][v6][a6]concat=n=7:v=1:a=1 [v][a] " -map "[v]" -map "[a]" trimmed.mp4

use an LLM to analyze the transcript for the timestamps to use for removing clips.