2024-06-25, 05:23 AM
This is a topic that can be confusing. From my understanding, basically it's up to the client to decide how to handle the flags.
The MKVToolNix program used to only allow a single default flag per stream type in a container. That got changed to allow for multiple as explained in the FAQ OP posted.
I think Jellyfin Web will work best with a single default flag, though I haven't tested a video with multiple default flags set.
And unlike your issue, I was able to set the web GUI to auto set a different audio track despite it not being set with a default flag. However, I couldn't do the same for subs.
The MKVToolNix program used to only allow a single default flag per stream type in a container. That got changed to allow for multiple as explained in the FAQ OP posted.
I think Jellyfin Web will work best with a single default flag, though I haven't tested a video with multiple default flags set.
And unlike your issue, I was able to set the web GUI to auto set a different audio track despite it not being set with a default flag. However, I couldn't do the same for subs.