I seem caught in an issue where I can't get everything I want. I'm hopeful it's just a setting I'm missing.

I am attempting to stream this from my Synology NAS server to my Sony Blu Ray player into my home theatre system.

I have three streams created by Vegas for a custom editing project:
* AVC video
* W64 uncompressed PCM 5.1 surround (24 bit, 48000 kbps)
* AC3 compressed 5.1 surround. (448 kbps)

The AC3 is just there as a backup stream and has provided a nice "control" while troubleshooting my output.

Using TS Muxer, I can author this to a blu ray folder with chapter stops, or a .ts or .m2ts file withOUT chapter stops.

If I use MakeMKV to create a .mkv file from the blu ray folder content, it loses the chapter stops, but I can put them back in with MKVToolNix.

The .ts files play the PCM stream just fine. But the .mkv file throws an error that the audio stream isn't recognized. Same stream, same source, same player. If I mux just the AC3 file, it plays just fine.

Is there something that needs to be tweaked for .mkv files to be happy with 5.1 PCM streams? Either in some file header edited by some tool, or some alternate (uncompressed) format of the .w64 output?