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I do not know yet if my new files are in perfect sync, I will post more about it when I watch more transcoded material. Then I left out the audio timecodes file and it worked out fine. mux.sh: line 4: 12944 Aborted mkvmerge -default-language eng -o "video-muxed.mkv" -language 0:eng -compression 0:none -timecodes 0:"video-timecodes.txt" -d 0 -no-chapters -A -S "video.h264" -language 0:eng -compression 0:none -timecodes 0:"audio-timecodes.txt" -a 0 -no-chapters -D -S "audio.m4a" -chapter-language eng -chapters "chapters.txt" Mkvmerge: /build/buildd/libmatroska-1.4.1/make/linux/././src/KaxCluster.cpp:279: int16 libmatroska::KaxCluster::GetBlockLocalTimecode(uint64) const: Assertion `TimecodeDelay >= int16(0x8000) & TimecodeDelay <= int16(0x7FFF)' failed.
![mkvtoolnix sync audio mkvtoolnix sync audio](https://www.geocities.ws/podernixie/htpc/vga2csync.gif)
![mkvtoolnix sync audio mkvtoolnix sync audio](https://zjistil-jit.net/ujga/D2DV1EB9npPFOntSlBTUPwHaD6.jpg)
The remaining frames of this track might not be timestamped the way you intended them to be. Warning: 'audio.m4a' track 0: The number of external timecodes 945 is smaller than the number of frames in this track. 'video.h264' track 0: Extracted the aspect ratio information from the MPEG-4 layer 10 (AVC) video data and set the display dimensions to 720/405. The file 'video-muxed.mkv' has been opened for writing. 'audio.m4a' track 0: Using the output module for the format 'AAC'. 'video.h264' track 0: Using the output module for the format 'AVC/h.264 (unframed)'. 'audio.m4a': Using the demultiplexer for the format 'QuickTime/MP4'.
![mkvtoolnix sync audio mkvtoolnix sync audio](https://i0.wp.com/www.techjunkie.com/wp-content/uploads/2016/08/out-of-sync4.jpg)
'video.h264': Using the demultiplexer for the format 'AVC/h.264'. Code: Select all mkvmerge v6.7.0 ('Back to the Ground') 64bit built on 18:03:17
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