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BrettSheleski / comchap

Commercial detection script to add chapters into video file
MIT License
136 stars 26 forks source link

Duration Check / Deltas? #17

Open arrmo opened 7 years ago

arrmo commented 7 years ago

Hi,

Just a thought, but any feeling for the timing "error" that should exist when cutting a file? Asking because I trimmed a file, and found that the deltas in the EDL file, vs. the file size change was off by a few seconds. Not a big deal of course, but just a bit surprised that it exists at all really.

Thoughts?

Thanks!

BrettSheleski commented 7 years ago

Are you saying the total time specified by the edl file is different from the resulting file?

arrmo commented 7 years ago

Not quite. If I take the original file size, subtract out the commercial time (from EDL) - the output file is not quite the same number as this (example below). Not a biggie, but trying to understand it.

> Original File Length (secs): 14819.739422
> Total Commercial Duration (cut from file, secs): 3755.23 (25.3%)
> Expected Final File Length (secs): 11064.509422
> Actual Final File Length (secs): 11062.123578
> Error in Final File Length (secs): -2.385844 (ABS = 2.38584)

Thanks!

BrettSheleski commented 7 years ago

I'll have to see what's going on with it. My guess is ffmpeg cannot create parts at the exact times specified for some reason.