When asking about the issue on their forums, I was bluntly told nobody had touched the VOB side of the program in eons and that there would be no further attention paid to that aspect. Note that I did first try MKVToolNix to do the transcoding, but that tool was vastly worse with sync issues. It stands to reason that there is something about the transcoding process (as opposed to the compression process) that is problematic with respect to maintaining sync. Quite some time ago I compressed the very same source material using HandBrake and that process yielded an MKV file, however those compressed MKV files do NOT exhibit the same audio/video sync as that the MakeMKV transcoding produced. I'm not sure what's happening here and was hoping somebody could help me. So I went back to the original VOB structure and played the movie at the same time code via VLC and it was just fine! This is happening to a significant number of my transcodes, and I simply can't trust the MKV files being produced. I'll view the MKV file via VLC at the indicated time code and sure enough the audio/video sync is awful. Output lines like the above are concerning because that amount of sync skew is definitely noticeable. Program reads data faster than it can write to disk, consider upgrading your hard drive if you see many of these messages.ĪV sync issue in stream 1 at 0:30:46.976 with duration of 32ms : broken timecode, apparent audio skew is -317.6msĪV sync issue in stream 1 at 0:36:20.352 with duration of 32ms : broken timecode, apparent audio skew is -346.733msĪV sync issue in stream 1 at 0:44:36.128 with duration of 32ms : broken timecode, apparent audio skew is -395.166msĪV sync issue in stream 0 at 0:45:37.101 : video stream has 5295 frames with invalid timecodes However, every now and then I'll see a bunch of lines like:ĪV sync issue in stream 1 at 0:20:59.040 with duration of 32ms : broken timecode, apparent audio skew is -241.066msĪV sync issue in stream 1 at 0:28:13.824 with duration of 32ms : broken timecode, apparent audio skew is -278.833ms During the transcoding I'll typically see quite a few lines similar to:ĪV sync issue in stream 0 at 0:05:30.680 : video frame timecode differs by +3.483msĮven though there's a lot of lines like that being produced as the script runs through my files, I'm ignoring them because I'd be hard pressed to notice a 5ms sync issue. I've separated the stuff needing subtitles for later. I'm using makemkvcon in a script to transcode from VOB to MKV while keeping only one audio track (typically the 5.1 English if available) and no subtitles. My source media is on one NAS box and my transcoded media is on another NAS box - all locally accessed over ethernet and connected to my 2019 MacBook Pro. they contain a VIDEO_TS folder that holds multiple VOB files containing all audio and subtitle tracks that came with the original DVD. They were all ripped from purchased DVDs as main movie only, and all ripped movies/episodes have a standard DVD structure i.e. I have 20TB of ripped and decrypted movies that I've been accumulating over my life.
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