… just now something I don’t get: aren’t mkvmerge and mkvtoolnix the exact same tools ?
I think mkvmerge is just a front end for mkvtoolnix. I just meant that I’ve never used the command line app, so if it has re-encoding options that aren’t in the GUI, I haven’t seen them.
It’s a pain going in the other direction, from MKV to m2ts for burning a blu-ray. You think you’ve got a file that’s small enough to fit on a disc, but it inflates as m2ts and goes above the limit for a disc.