I have atv flash black installed.
When streaming all videos the quality of the picture is not 100%. Doesnt matter if i use the mediaplayer or xmbc or youtube.
There are constant millisecond white flashes over the screen during the playback. All random.
After putting more then 2 days of reading and testing i randomly changed the hz.
When changed to 50 from 60 hz in the main settings of the atv it worked out well!