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Old 22nd June 2013, 00:34   #1  |  Link
digitall.h
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Join Date: May 2012
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Posts: 257
Concatenate several mp4 files

I have encoded 12 chapters from 3 DVDs.
Each chapter was encoded using latest Hybrid Linux version 2013.06.16.1, in mp4 containers, and all of them are in the same format: an x264 video track, original ac3 audio track and chapter track.They share the same video PAR and same audio bitrate and channels.
I now want to join them in a single file.
I tried with MP4Box:
Code:
MP4Box -add 01.mp4 -cat 02.mp4 -cat 03.mp4 -new all.mp4
It merged the videos, but first chapter did not have audio track.


I then tried:
Code:
MP4Box -cat 01.mp4 -cat 02.mp4 -cat 03.mp4 -new all.mp4
And it generates a single mp4 file with all chapters, but the generated file has 2 problems:
  • Audio goes out of synch
  • When playing the file, there appears video artefacts that are not present in the files generated by Hybrid
The audio problem I googled a bit and found that it's a known problem. I don't know if I can fix it with some tweak in the MP4Box command.
The video problem is a weird one, since I thought that MP4Box just concatenated the files, and I don't understand why it degrades the encode.

Can I change anything in my code to avoid these problems?.
Is there another method to join the mp4 files?.
My system is Linux Mint KDE 13.
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