Movie File Size Reduction with Only Audio Track Name Change

[ngs428]

Hello,
I am looking at a couple ways to change the Audio Track Name in some of my files.

1st Option: I can go in the header editor and change the track name and save, pretty easy. I will probably just use this, but I have a question below...

2nd Option: I can load the file in the Multiplexer, select the track and change the track name. (no other changes are done).

Original

Format : Matroska
Format version : Version 4
File size : 6.41 GiB
Duration : 1 h 42 min
Overall bit rate mode : Variable
Overall bit rate : 8 962 kb/s
Movie name : Cars 3
Encoded date : UTC 2021-07-02 04:15:11
Writing application : HandBrake 1.3.3 2020061300
Writing library : Lavf58.29.100
ErrorDetectionType : Per level 1


[Attachment 59658 - Click to enlarge]

New

Format : Matroska
Format version : Version 4
File size : 6.28 GiB
Duration : 1 h 42 min
Overall bit rate mode : Variable
Overall bit rate : 8 772 kb/s
Movie name : Cars 3
Encoded date : UTC 2021-07-02 12:27:59
Writing application : mkvmerge v58.0.0 ('Supper's Ready') 64-bit
Writing library : libebml v1.4.2 + libmatroska v1.6.4 / Lavf58.29.100


[Attachment 59659 - Click to enlarge]

The total file size went from 6.41GB to 6.27GB just by renaming the audio track using option 2. What else is MKVMerge doing to the file? Stripping unneeded data?

[ngs428]

Any thoughts?

[jagabo]

Different containers and different multiplexers have different overheads. Did you include all tracks including subtitles, chapters, etc? You cut off the bottom of the images so we can't tell.

[ngs428]

Different containers and different multiplexers have different overheads. Did you include all tracks including subtitles, chapters, etc? You cut off the bottom of the images so we can't tell.

Yes, all tracks were left the same. I simply opened MKVToolNix, drug the file in, changed the track name and then multiplexed it. That was it. Nothing was removed, added, etc.

I think I will just use the header editor since it is faster and seems to get me what I am looking for. Thanks!


[Attachment 59696 - Click to enlarge]

[ccbradley]

Can you reproduce this effect with smaller video files and post them? I’d be happy to examine the difference to see what’s going on here.

[ngs428]

Can you reproduce this effect with smaller video files and post them? I’d be happy to examine the difference to see what’s going on here.

Any file I bring through the program this way reduces in file size. Smaller files, not so much obviously... Here is a small file..

Files attached.

[johns0]

Better to upload the files here,there's a 500MB max files size.

[jagabo]

It looks like the difference between ffmpeg and mkvtoolnix muxing. If I remux the mkvtoolnix version with ffmpeg I get almost exactly the same size as the original, within about 400 bytes.