split video with ffmpeg

[lomero]

i have video file to 2.3GB 116 minutes
how to split video into 3 equal parts?
or also split video into 3 parts by time: 40min + 40min + remaining time (36min)
now i use:

ffmpeg -i input.mkv -ss 00:00:00.00 -to 00:40:00.00 -acodec copy -vcodec copy -y output_1.mkv
ffmpeg -i input.mkv -ss 00:40:00.00 -to 01:20:00.00 -acodec copy -vcodec copy -y output_2.mkv
ffmpeg -i input.mkv -ss 01:20:00.00 -to 01:56:00.00 -acodec copy -vcodec copy -y output_3.mkv

but i would like only one command to split the video. any tips?

[jagabo]

This gives 1 character segment numbers:

ffmpeg -i input.mkv -f segment -segment_time 2400 -c copy output%1d.mkv

Note: 2400 seconds = 40 minutes

[lomero]

very nice. many tanxs!

from another site i've found this add-on

 -threads 8

is good idea or not?

[jagabo]

The number of threads won't make any difference when not re-encoding. The process is I/O bound, not CPU bound.

[lomero]

ok. and instead it can be useful in the case of only video encoding? (no audio, only video encoding)

[jagabo]

ffmpeg automatically picks the number of threads for your CPU every time it starts up. You usually don't have to worry about the setting.

[lomero]

ok listening to your advice, i don't use this setting!
tanxs for your tips.

[lomero]

on ffmpeg have pause option during conversion...
but it's possibile full stop and resume from it was interrupted?

[jagabo]

but it's possibile full stop and resume from it was interrupted?

Not that I know of. But you can run it at low priority so it doesn't interfere with foreground tasks. Start Task Manager and set the priority to Low. Or you can start it with low priority with something like:

Start /b /low "title" ffmpeg rest of command line

[lomero]

thank you, but that's not my problem.
the thing is, sometimes it takes about 40 minutes for a code. if i don't want to wait for the end, i wanted to know if there was a way to stop and then resume.
this is because if i have to leave and then i hibernate the pc, if i have a coding in progress, even if on pause, the time for hibernation increases.
important is already able to pause the coding process!

[jagabo]

If the input and output files are local you can just use the computer's sleep function. When it wakes ffmpeg will continue running.