id summary reporter owner description type status priority milestone component version severity resolution keywords cc mlocked 13369 Playback issues with 30Hz display paulsd Mark Kendall "I'm using MythTV 2:29.1+fixes.20180414.329c235-0ubuntu3 in Ubuntu 18.04. I recently got a new 4K TV. This TV has one HDMI 2.0a port (which supports 4K@60Hz), and three HDMI 1.4 ports (which only support 4K@30Hz). If I connect my MythTV box to the HDMI 2.0a port and configure X to display at 4K@60Hz, then everything works fine. Unfortunately, only the HDMI 2.0a port on the TV supports ARC, so this port needs to be connected to my stereo system instead of my MythTV box. If I connect my MythTV box to an HDMI 1.4 port and configure X to display at 1K@60Hz, then everything works fine. However, if I connect my MythTV box to an HDMI 1.4 port and configure X to display at 4K@30Hz, then Recordings work fine, but LiveTV playback doesn't work. Specifically, LiveTV video is played at half speed, and only brief clips of audio are occasionally played. The same symptom occurs using any of the accelerated Playback Profiles (my system only supports OpenGL and VAAPI, so I can't test VDPAU). LiveTV plays at half speed even if audio is disabled (by setting the 'Audio output device' to NULL in the frontend settings). If I use a non-accelerated Playback Profile at 4K@30Hz, then LiveTV plays properly, but I have other problems (video tearing and high CPU usage). In addition, if audio is disabled (by setting the 'Audio output device' to NULL in the frontend settings), then LiveTV still works as expected, but Recordings play back at double speed. So, something is clearly different about the display refresh rate handling for LiveTV vs Recordings, and both are wrong in some cases." Bug Report - General closed minor 31.0 MythTV - General v29.1 medium Works for me 0