the no sound and bad PQ was playback was using 4k DTS mkv files located on my nas, connected to my LAN, which is mapped on my Q10. I also had sound issues with 11080p DTS movies. I've been testing a few different firmware options and so I need to step back and test again with the official release. Some of my issues were my fault, having the box or kodi settings wrong. Been trying hdmi raw vs Auto, etc.
I reset the Q10 using the official (recently updated) firmware. I did not use the custom firmware, as example. I will test playback of both 1080p and 2160p and hope to get DD, DTS.
My Q10 is connected directly to my Vizio 4k tv, on a port currently supporting 4k@30fps. I have optic out on my tv that feeds my Yamaha RX A820. I can't run the hdmi through the yamaha because it is not 4k compatible. I have 5.1 speakers setup.
I plan to test without the wrapper installed, given I don't need it. Soon I will have enough money for a new yamaha rx-a750 that supports 4k and true hd 7.1. I will be getting 2 more speakers. At that point, i will need the wrapper to get 7.1 and true hd - right?
Update: My tests were with the official release using kodi that came with the firmware, no wrapper and no addons. Again, I only have 5.1 DTS sound, so no need to test with the wrapper.
2160p playback does not work very good. If I do get both picture and sound, they are both bad, skipping, studdering, audio skipping, etc. Some 4k movies won't play at all, some with picture only. Bottom line, out of the box, this unit does not play 4k - YET
All movies at 1080p with DTS or DD play just fine.
Resolution does not switch automatically, so I have to set the screen resolution each time. For example, if I play a 2160p movies, but leave the resolution on 1080p, it will not change - meaning it plays at 1080p. Some 4k movies did play at the lower resolution, while they would not play at 2160p. Same goes the other way. If I leave the resolution at 2160p, and play 1080p movies, they are upscaled to 2160p. They do play fine, but the resolution should fall back to 1080p.
I tried selecting the box in Settings that says "HDMI auto adaptation" under Display settings. If I check this box, the resolution will drop to 1080p and STAY t here. If I change the resolution to 2160p, that box is unchecked and the resoltuion will stay at 2160. Bottom line - the auto adaptation does not work so switching resolutions does not work.
If you are using the official firmware with no wrapper (sound is 5.1) and you are getting good 4k results, I want to hear from you on how this is possible. I will admit that I only have 5 4k movies to test with, and it is possible that these rips are not good. There just isn't that much 4k content out there yet.