after a few minutes sound stutters for about 2-3 seconds, then plays fine. I am playing h264 720p content over HDMI using latest OSMC version
when playing 1080p - setting resolution of Kodi to 1080p (instead of DESKTOP in menues - default) - Kodi just freezes in half an hour
I have downclocked the Raspberry to 700/250/400.
The problem 1) I also had on Raspbmc, but with an Firmware patch it went away - patched the bin file. How to do this on OSMC?
The problem 2 is just wierd. Even playing 1080p content on DESKTOP resolution settings - default - the info on my TV screen resolution stays 720p, so the 1080p content is really not working. Only when I change it to 1080p in menues, then it is really 1080p. Is there no way to autodetect and change playback resolution on the fly?
I also have no problem to always have it in 1080p but then the problem 2) ocurrs - freeze after 30min.
OSMC has a much later version of the Pi firmware than Raspbmc - we keep the firmware up to date so attempting to patch it is not going to help you.
Kodi does not change resolution on the fly - it will scale the content to whatever resolution you have set. So if you want to get full 1080p quality you should set your Kodi resolution to 1080p. Then when you play lower resolution files they will get scaled up to 1080p using a high quality scaler.