Editing Openai/6957d2e8-b738-8008-987a-09a5d9f29bc8 (section)

=== Assistant: Here are two good ways to do it. ===
Here are two good ways to do it.

==== This will cut exactly at those timestamps and stitch into one file. ====

<syntaxhighlight lang="bash">ffmpeg -i input.mp4 -filter_complex \
"[0:v]trim=start=62:end=133,setpts=PTS-STARTPTS[v0]; \
 [0:a]atrim=start=62:end=133,asetpts=PTS-STARTPTS[a0]; \
 [0:v]trim=start=197:end=326,setpts=PTS-STARTPTS[v1]; \
 [0:a]atrim=start=197:end=326,asetpts=PTS-STARTPTS[a1]; \
 [0:v]trim=start=561:end=568,setpts=PTS-STARTPTS[v2]; \
 [0:a]atrim=start=561:end=568,asetpts=PTS-STARTPTS[a2]; \
 [0:v]trim=start=584:end=604,setpts=PTS-STARTPTS[v3]; \
 [0:a]atrim=start=584:end=604,asetpts=PTS-STARTPTS[a3]; \
 [v0][a0][v1][a1][v2][a2][v3][a3]concat=n=4:v=1:a=1[v][a]" \
-map "[v]" -map "[a]" \
-c:v libx264 -crf 20 -preset medium \
-c:a aac -b:a 160k \
-movflags +faststart \
output.mp4

</syntaxhighlight>

Timestamps converted to seconds:
* 01:02–02:13 → 62–133
* 03:17–05:26 → 197–326
* 09:21–09:28 → 561–568
* 09:44–10:04 → 584–604

: 

==== This tries to avoid re-encoding. Often works, but accuracy depends on keyframes. ====

<syntaxhighlight lang="bash">ffmpeg -ss 01:02 -to 02:13 -i input.mp4 -c copy -avoid_negative_ts 1 part1.mp4
ffmpeg -ss 03:17 -to 05:26 -i input.mp4 -c copy -avoid_negative_ts 1 part2.mp4
ffmpeg -ss 09:21 -to 09:28 -i input.mp4 -c copy -avoid_negative_ts 1 part3.mp4
ffmpeg -ss 09:44 -to 10:04 -i input.mp4 -c copy -avoid_negative_ts 1 part4.mp4

printf "file 'part1.mp4'\nfile 'part2.mp4'\nfile 'part3.mp4'\nfile 'part4.mp4'\n" > list.txt
ffmpeg -f concat -safe 0 -i list.txt -c copy output.mp4

</syntaxhighlight>

If you tell me whether you want exact cuts (Option A) or fast/no re-encode (Option B), I can tailor the command for your codec/container constraints.