@alimento, I may have a third option if you want to keep all the subtitle/audio tracks.
I found this January 2016 post on this same thread:
The Aluminum Falcon said:
Thank you for the share!
Not sure if this has been discussed before, but, when muxing the MKV with TSMuxer, I found, to create a functional BD ISO, I needed to set, under “General track options,” “Do not change SEI and VUI data” rather than the default “Insert SEI and VUI data if absent.”
Has anyone else trying to burn had this experience?
I encountered a similar instance with HAL 9000’s fan edits of the Star Wars prequel; it’s apparently something to do with how the original MKV is encoded.
Now, @alimento, you did this:
I assume I am missing something simple, but as a beginner in this process I’m not sure what it would be. I have tried using the tsMuxer setting “Do not change SEI and VUI data”, but that does not seem to affect the resulting ISO file size.
I am thinking that you may have an older version of TSMuxer, so download the latest version and try making your ISO from the original file, again using the same settings and the option, “Do not change SEI and VUI data” needs to be selected. If that doesn’t work, then you may have to download an older version of TSMuxer that was created before January 2016 to get the results that @The Aluminum Falcon had.
I think that “Do not change SEI and VUI data” needs to be selected so that the software will not add on any inflated data to the ISO.