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Old 10th January 2021, 12:15   #1  |  Link
d3crypti0n
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Join Date: Aug 2020
Posts: 18
MKVtoolNix Bitrate change

Hello everybody,

Yesterday evening I extracted a Movie using MakeMKV and also kept the bonuses on that disc. After the extraction I usually use a tool called MKV Optimizer which uses MKVToolNix to remove all subtitles and audio tracks which are not the ones set in the condition (meaning only German and English Audio- und Subtitle tracks will be kept).

There I noticed that after the re-Mux the video bitrate was smaller. It is no way near of a big deal (it went from 4 994 kb/s to 4 993 Kb/s). I googled and found out that it was due to the Subtitles being compressed with zlib and if I understood correct they were somehow part of the video which decreased the bitrate.
Is this right so far?

But since the MKV Optimizer tool runs through every file it also changes the Bitrate of videos were no muxing needs to be done. There is one short clip which had only one Audio track and no subtitle tracks so in conclusion nothing had to be removed and nothing should have been changed. But the video bitrate changed from 4 993 Kb/s to 4 895 Kb/s. Again, this is no big deal but I still wonder why this happened. Since MKVToolNix does not re-encode I wonder why my bitrate decreased ? Can someone explain why and also if there has been a (even little) drop in quality?

Edit: Both videos used AVC and there has been no change of video length.
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avc, bitrate, mkvtoolnix

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