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File -> Open DVD Files Manually:
Error:
File -> Open Files:Calculated BUP offset for VTS #1 does not match one in IFO header.
Manual String parse error : string is empty
Failed to open disc
------------------------------------------------Operation successfully completed (with Errors)
VIDEO_TS/VTS_01_4.VOB' is corrupt or invalid at offset 3536570368, attempting to work around
AV synchronization issues were found in file '...test.mkv' (title #1)
AV sync issue in stream 0 at 1:35:12.406 : video frame timecode differs by -233.566ms
AV sync issue in stream 0 at 1:35:12.640 : video frame timecode differs by -367.033ms
AV sync issue in stream 0 at 1:35:12.673 : video stream has 2 frames with invalid timecodes
1 title saved
The above "DVD" exemplary errors are not indicicative of "all" AV sync VOB issues, however I have ran into this, albeit very rarely, on both Blu-ray as well, regarding m2ts streams...?
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In the above DVD case, the resultant "test.mkv" would not play on my BD/DVD player, nor would it play in VLC.
(However, it did play via "mplayer" -go figure eh?
Anyway, by merging the VOB files using MKVToolNix, and in my case, enabling "fix bitstream timing info" I was able to successfully create an mkv that now works fine on all my media players.
http://www.chrisvanpatten.com/merge-vob-mkvtoolnix
Note: obviously mileage will vary depending on how corrupt/damaged your Vob/DVD/... media files are.
Hope this may help.