[Mosu]

Originally Posted by aabxx

Does this mean --engage use_simpleblock should not be used when muxing ogg vorbis?

No. This is not a problem due to two reasons:

1. Matroska specs say that the duration of a (simple) block is either
   1. the value of the BlockDuration element if present, or
   2. the value of the track's DefaultDuration element or
   3. the difference to the next block of the same track if neither a) nor b) is given.
   For Vorbis mkvmerge does not write a DefaultDuration element meaning that the duration is always the difference of the current and next timecodes for this track which is perfectly fine with simple blocks.
2. If a default duration is given and the current packet's duration is different than the default duration then mkvmerge writes a normal block, even if "--engage use_simpleblock" is turned on.