With orb NOTHING worked. I got one mp4 to work, but the audio was downmixed to 2 channel mpeg audio. So.... boo on that.
In your case, 1280 X 5XX MKV's are the problem by your description. You could avoid headaches by finding MKV that are 720 or 1080. Basically, not 5XX
I can't download over 12000 videos to make them Orb compliant.
Go ahead and use Orb. Bet you NONE of your MKV work, nor most of your other video media. And if you get the video to play, you will probably have downmixed 2channnel audio.
Why don't you try demuxxing the MKV then remux into m2ts or use Yamb and create mp4's (not sure of what is Bravia compatible). Maybe avoiding transcode via PMS will help. Just remux outside of PMS.
Just my opinion. I find it easier to manipulate few files myself, than switch media servers and spend days trying aimlessly to get just a few to work.
Again, just the opinion of someone who has literally THOUSANDS of videos in various formats and qualities, varying from SD to FULL 1080p with DTS with crazy bitrates, and who has problems with less than a handful of them while using PMS
Not stopping any of you from going to another media server. If you don't like PMS, go ahead.....just .... have fun with that.
That's all I'm saying.