[FFmpeg-user] FFMPEG changes bitrate after splitting a file

Julian Docev j.docev at gmail.com
Tue Oct 15 03:05:19 EEST 2019

Thank's a lot for your answer. It was very helpful.


On Mon, 14 Oct 2019, 10:00 Noeck, <noeck.marburg at gmx.de> wrote:

> Hi Julian,
> all frames have different sizes depending on the content’s complexity
> and groups of pictures have different sizes mostly depending on how
> quickly the image changes. That’s why the bitrate varies over time and
> every part (split) of the video has a different bitrate. The overall
> bitrate is an average of all individual bitrates (weighted by duration
> of the splits).
> You can limit the file size of one part with the -fs option, but you
> know only afterwards how long it got. And then you can use this duration
> to start the next part from this point in time.
> Some more hints:
> https://stackoverflow.com/questions/38259544/using-ffmpeg-to-split-video-files-by-size
> https://superuser.com/questions/712893/how-to-split-a-video-file-by-size-with-ffmpeg
> Cheers,
> Daniel
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