can you please check OP for update file and install it? H264 should be much better (almost usable) now for non-interlaced content. I also removed some HDMI audio WIP patches which probably cause issues on your setup.
Jernej, sorry for the confusion with the update because of my card, now it worked. Sorry also regarding the sound issue: I now connected it to my (Onkyo) AV receiver and locally decoded sound works, both GUI and in media files. Passthrough with AC3 did not work though, the AV receiver played "white noise". So 'no sound' seems to be an issue special to my TV. HDMI CEC also does not work, but that is probably also special to the TV.
Indeed, much improvement regarding the glimpes with H.264! The videos from the smartphone now work without any 🙂. In general: No "wrong/random color block" glimpses any more at all. With some videos from public TV media libraries text and other sharp contrast blocks "jump", so that the video starts to flickr. Some videos downloaded from the Internet in MP4 containers stop playing after a few seconds. They have main@3 or 3.1 profile, if that helps you. Also the sound in them (AAC) does not work. Probably they are somewhat out of the norm, but they work on a Raspi 1 with Kodi 18 beta 1.