this post was submitted on 10 Mar 2024
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I'm not sure if it's fixed now but a few years ago Plex ignored the properties and played the first audio stream it found. I had Scooby Doo with Portuguese as the first audio track and although mkvpropedit worked when playing back in VLC, in Plex it would still play Portuguese as default. I had to re merge the streams with English as the first track for Plex to play English by default.
Plex has a built in solution for that now
I'm thinking of ~~2~~ 3 issues here.
Either your file had the propertie flag
--forced-display-flag
for the audio track 1 and this would force the audio 1 to play even if you changed theflag-default
with mkvpropedit. In that case you have no other choice to remux your file with mkvmerge and change the flag to--forced-display-flag 1:no
(if it's the audio track 1) I have no idea why someome would force an audio track....Or you didn't used the
--edit track:s1
flag with theflag-default
propertie, which uses mkvmerge under the hood. Reading through my notes there is a superuser.com link talking specifically about that, and how it could fuck up your tracks order if you don't use thetrack
flag.Edit: This is only true if your player is capable to select the audio based on the flag default or forced. Otherwise you have to remux the file and change the order of tracks with the
--track-order
flag with mkvmerge. ~~This could be the case for Plex, you can probably find that info in the plex documentation !~~Edit2: Plex seems to use both but I would suspect plex or bad flags being the culprit here rather than mkvtools.
Yes, the problem was Plex. Other players were fine.