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1

I've built a small pipeline to automatically cut and enhance video files which I recorded.

I detect scenes by using the ffmpeg's select='gt(scene,0.4)',showinfo filter. After parsing these information I run ffmpeg for each scene to produce single video files for them, for example:

ffmpeg -y -i test.avi -ss 00:00:00.00 -to 00:00:54.61 -c copy test_1.avi
ffmpeg -y -i test.avi -ss 00:00:54.61 -to 00:01:38.21 -c copy test_2.avi
ffmpeg -y -i test.avi -ss 00:01:38.21 -to 00:01:59.45 -c copy test_3.avi
[...]

As you can see I use the -ss and -to parameters to specify where the output files should start and end. This is working very well but it becomes very, very slow over time since my original file size is ~50 gigabytes.

I guess that -ss lets ffmpeg seek from the beginning of the original file to the start time as I can observe disk action when seeking.

Placing the -ss param before the -i input file is faster but very inaccurate (off by some seconds).

Is there maybe any trick to increase the cut/trim performance without losing the accuracy?

I also tried to convert the input file to MP4 which decreases the file size and seek time significantly. But then I had keyframe errors and I want to operate on the original files.

Thank you!

ffmpeg

share|improve this question

asked Mar 21 at 13:48

C.M.C.M.

331412

add a comment | 

1

I've built a small pipeline to automatically cut and enhance video files which I recorded.

I detect scenes by using the ffmpeg's select='gt(scene,0.4)',showinfo filter. After parsing these information I run ffmpeg for each scene to produce single video files for them, for example:

ffmpeg -y -i test.avi -ss 00:00:00.00 -to 00:00:54.61 -c copy test_1.avi
ffmpeg -y -i test.avi -ss 00:00:54.61 -to 00:01:38.21 -c copy test_2.avi
ffmpeg -y -i test.avi -ss 00:01:38.21 -to 00:01:59.45 -c copy test_3.avi
[...]

As you can see I use the -ss and -to parameters to specify where the output files should start and end. This is working very well but it becomes very, very slow over time since my original file size is ~50 gigabytes.

I guess that -ss lets ffmpeg seek from the beginning of the original file to the start time as I can observe disk action when seeking.

Placing the -ss param before the -i input file is faster but very inaccurate (off by some seconds).

Is there maybe any trick to increase the cut/trim performance without losing the accuracy?

I also tried to convert the input file to MP4 which decreases the file size and seek time significantly. But then I had keyframe errors and I want to operate on the original files.

Thank you!

ffmpeg

share|improve this question

asked Mar 21 at 13:48

C.M.C.M.

331412

add a comment | 

I've built a small pipeline to automatically cut and enhance video files which I recorded.

I detect scenes by using the ffmpeg's select='gt(scene,0.4)',showinfo filter. After parsing these information I run ffmpeg for each scene to produce single video files for them, for example:

ffmpeg -y -i test.avi -ss 00:00:00.00 -to 00:00:54.61 -c copy test_1.avi
ffmpeg -y -i test.avi -ss 00:00:54.61 -to 00:01:38.21 -c copy test_2.avi
ffmpeg -y -i test.avi -ss 00:01:38.21 -to 00:01:59.45 -c copy test_3.avi
[...]

As you can see I use the -ss and -to parameters to specify where the output files should start and end. This is working very well but it becomes very, very slow over time since my original file size is ~50 gigabytes.

I guess that -ss lets ffmpeg seek from the beginning of the original file to the start time as I can observe disk action when seeking.

Placing the -ss param before the -i input file is faster but very inaccurate (off by some seconds).

Is there maybe any trick to increase the cut/trim performance without losing the accuracy?

I also tried to convert the input file to MP4 which decreases the file size and seek time significantly. But then I had keyframe errors and I want to operate on the original files.

Thank you!

ffmpeg

share|improve this question

asked Mar 21 at 13:48

C.M.C.M.

331412

ffmpeg -y -i test.avi -ss 00:00:00.00 -to 00:00:54.61 -c copy test_1.avi
ffmpeg -y -i test.avi -ss 00:00:54.61 -to 00:01:38.21 -c copy test_2.avi
ffmpeg -y -i test.avi -ss 00:01:38.21 -to 00:01:59.45 -c copy test_3.avi
[...]

share|improve this question

asked Mar 21 at 13:48

C.M.C.M.

331412

share|improve this question

asked Mar 21 at 13:48

C.M.C.M.

331412

asked Mar 21 at 13:48

C.M.C.M.

331412

asked Mar 21 at 13:48

C.M.C.M.

331412