Score:1

Ubuntu

Using ffmpeg to cut up video at multiple points

Jamie Hutber

1/26/23, 9:23 AM

I have a video that is a football game. I would like to cut the time before the game, during half time and finally the end of the game.

Total Clip Length 1h 51m or 111m

Ideally the cuts and time are as follows:

+------------+-------------+---------------------+
| Start Time | Finish Time |    Clip Duration    |
+------------+-------------+---------------------+
| 1:30       |   47:30     |  47:30              |
| 53:00      |   100:00    |  47                 |
+------------+-------------+---------------------+

However my video finishes at

ffmpeg -ss 00:01:30 -i Tripod_Camera.mp4 -t 00:47:30 -ss 00:53:00 -t 00:47:00 -c copy VideoClip.mp4

244

0 + 0

video

ffmpeg

24601

1/26/23, 9:58 AM

have you consider using a tool such as `LosslessCut` to perform this task? See [this reference](https://www.maketecheasier.com/extract-clips-video-losslesscut/?utm_source=newsletter&utm_medium=email&utm_campaign=07092020)

vanadium

1/26/23, 10:11 AM

@24601 ffmpeg can do this perfectly, and the command given indeed does that losslessly. It is a matter of finding the correct command options to do it in one go.

Jamie Hutber

1/26/23, 12:48 PM

@vanadium ye correct. I just don't know when or how! :/

llogan

1/26/23, 5:30 PM

How accurate do you need the cuts to be? Because if you can accept cutting only on keyframes then you can do this without re-encoding. Refer to [Checking keyframe interval?](https://stackoverflow.com/a/18088156/) to see keyframe frequency.

Jamie Hutber

1/26/23, 8:13 PM

It doesn't need to be tight at all actually. Considering I've allot of lea way on either side of the times. Its more that I could not work out how to pass `2 cuts` as it were to one FFMPEG command.

andrew.46

1/27/23, 4:14 AM

Some direction here: https://superuser.com/questions/681885/how-can-i-remove-multiple-segments-from-a-video-using-ffmpeg

Score:2

Ubuntu

llogan

1/27/23, 5:40 PM

Make input.txt containing the timestamps (in seconds) to cut:

file 'input.mp4'
inpoint 90
outpoint 2850
file 'input.mp4'
inpoint 3180
outpoint 6000

Run ffmpeg to concatenate with the concat demuxer:

ffmpeg -f concat -i input.txt -c copy output.mp4

This will stream copy, so no re-encoding occurs meaning the whole process will be fast and quality will be preserved. However, cuts will be made on keyframes, so it may not be accurate enough. If greater accuracy is needed you'll have to use a much slower method such as using the (a)trim, (a)setpts, and concat filters which requires re-encoding.
If you get A/V desync then get timestamps of keyframes, use keyframe timestamps as your inpoint, but add 0.001 to each inpoint timestamp in input.txt.

0 + 0

Jamie Hutber

1/30/23, 11:14 PM

Thank you :D This does work perfectly! I have to ask, does it have to be a file? Or could I do it directly in the terminal?

llogan

2/1/23, 4:43 AM

@JamieHutber Kind of. See [FFmpeg Wiki: Concatenate](http://trac.ffmpeg.org/wiki/Concatenate).

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Using ffmpeg to cut up video at multiple points

TH: การใช้ ffmpeg เพื่อตัดวิดีโอในหลายจุด

RO: Folosind ffmpeg pentru a tăia videoclipuri în mai multe puncte

RU: Использование ffmpeg для обрезки видео в нескольких точках

VI: Sử dụng ffmpeg để cắt video ở nhiều điểm

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.