Unfortunately seamless playback of 1080p50 MTS and MP4 files encoded with H.264 is not possible with Beta 9. There is severe stuttering with all players (XMBC, 4K Player, MXPlayer). I verified that Hardware acceleration is enabled. Stuttering is even much worse than with Beta 7, although I expected an improvement (I skipped Beta 8 due to it's instability). Stuttering is independent from display resolution (I tested 1080p50 and 720p50). Contrary to this, playback of 4Kp24 is smooth and reliable (Display configured to 1080p24).