Split video into segments

[suntong]

ffcvt should allow/help splitting video into several segments.

[suntong]

Fixed!

Still using the Nice_scenic_videos_from_dashcam_With_Evening_sunset_view.mp4 file,

Nice_scenic_videos_from_dashcam_With_Evening_sunset_view.mp4

With the fixed new ffcvt:

$ ffcvt -force -f "$FFCVT_FTC" -Seg 00:01:20

== Transcoding: Nice_scenic_videos_from_dashcam_With_Evening_sunset_view.mp4
] ffmpeg -i Nice_scenic_videos_from_dashcam_With_Evening_sunset_view.mp4 -speed 2 -af volume=1.6 -c:v libvpx-vp9 -b:v 0 -crf 45 -c:a libopus -b:a 64k -c:s copy -y -f segment -segment_time 00:01:20 -reset_timestamps 1 Nice_scenic_videos_from_dashcam_With_Evening_sunset_view%02d_.mkv

Done.
Org Size: 9765 KB
New Size: 2488 KB
Saved:    74% with 7277 KB
Time: 2m27.7866055s at 2021-10-10 17:47:06

Transcoding completed in 2m27.7871157s
Org Size: 9 MB
New Size: 2 MB
Saved:    74%

$ for f in Nice_scenic_videos_from_dashcam_With_Evening_sunset_view*_.mkv; do echo $f; ffmpeg -i $f |& grep Duration:; done
Nice_scenic_videos_from_dashcam_With_Evening_sunset_view00_.mkv
  Duration: 00:01:21.16, start: -0.006000, bitrate: 278 kb/s
Nice_scenic_videos_from_dashcam_With_Evening_sunset_view01_.mkv
  Duration: 00:01:21.15, start: 0.000000, bitrate: 251 kb/s
Nice_scenic_videos_from_dashcam_With_Evening_sunset_view02_.mkv
  Duration: 00:01:01.87, start: -0.001000, bitrate: 236 kb/s

Note,

• It’ll cut at the first frame after the time specified with the -Seq option.
• It gives very accurate splits -- rather than splitting based on a particular time, it splits on the nearest keyframe following the requested time, so each new segment always starts with a keyframe.

[suntong]

The converted results are:

Nice_scenic_videos_from_dashcam_With_Evening_sunset_view00_.mov

Nice_scenic_videos_from_dashcam_With_Evening_sunset_view01_.mov

Nice_scenic_videos_from_dashcam_With_Evening_sunset_view02_.mov

(the total time doesn't add up to 5:40, because I have to cut short of the source video so as to be able to post here, while leaving the original MP4 header intact. I.e., the actual playable length is only about 3:43).