[ffmpeg] Slice until end of file?

[yetanotherlogin]

Hello

I need to slice a 2hrs5mn FLV file into roughly three equal parts, ie. about 40mn (2400sec) each.

Since I don't know of a better free tool available for Windows, I used ffmpeg.

It worked OK for the first two slices, but I didn't find how to run the last command successfully, by telling ffmpeg to simply slice until the end of the file:

ffmpeg -ss 00:00:00 -t 00:40:00 -i input.flv -c:a copy -c:v copy output.1.flv

# 10s overlap to make it easier to move on to next video
ffmpeg -ss 00:39:50 -t 2400 -i input.flv -c:a copy -c:v copy output.2.flv

# Commands fail with "Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)"
ffmpeg -ss 01:19:40 -i input.flv -c:a copy -c:v copy output.3.flv

Thanks for any help.

[Baldrick]

How about adding a large value to -t at the last command,

-t 4894954

what happens then?

[Baldrick]

Or if you don't mind remuxing(no reconversoin) to a mkv so can you try mkvmergegui. Add the flv, under the global tab choose split after duration,set it to 2400s and start muxing to make an mkv from the flv.

[yetanotherlogin]

Thanks, but it doesn't work either: The file only lasts 1sec instead of about 40mn.

There's also a problem with the second file, which should be 40mn but is 26mn38 or 26mn48 instead:

ffmpeg.exe -input.flv
Duration: 02:05:17.08, start: 0.000000, bitrate: 296 kb/s
  
ffmpeg -ss 00:00:00 -t 00:40:00 -i input.flv -c:a copy -c:v copy output.1.flv
40mn

ffmpeg -ss 00:39:50 -t 01:19:50 -i input.flv -c:a copy -c:v copy output.2.flv
26mn48s????
ffmpeg -ss 00:40:0 -t 01:20:00 -i input.flv -c:a copy -c:v copy output.2.flv
26mn38s???

ffmpeg -ss 01:19:40 -t 4894954 -i input.flv -c:a copy -c:v copy output.3.flv
1sec???

Google didn't help. Maybe ffmpeg doesn't handle FLV files reliably.
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Edit: Problem solved by using AviDemux instead.

Thanks for the help.