Say you have a 50Hz display but 24p content. It alters the playback speed so that it matches the display refresh rate (which could be fixed or could be variable if you have also selected Adjust Display Refresh Rate) This is great if you have a display and hardware that copes with everything flawlessly. If you have a display that supports 24Hz, 50Hz and 60Hz content, then 24Hz will be output at 24H, 50Hz at 50Hz and 60Hz at 60Hz. So if you have a display that supports 50Hz and 60Hz content, 50Hz content will be output at 50Hz and 60Hz content at 60Hz, however 24Hz will be output at 60Hz with 3:2 (ignoring 1000/1001 refresh rates (*)) This setting allows Kodi to change the frame rate of the video output fed to the display, to ensure the best refresh rate is selected.
"Adjust Display Refresh Rate" will switch the output refresh rate when playing back a file to the best refresh rate that is supported by the display AND the hardware Kodi is running on (as reported by EDID) If you don't select this option then you output at a fixed display refresh rate, which is usually set in Settings->System->Video Output. The additional link to another forum thread ( Adjust Display Refresh Rate vs Sync Playback to Display) showed an outstanding explanation of these settings by the user " noggin": Settings>video>playback>adjust display refresh rate to match display. The thread was not marked as resolved, but the given advise sounded like a good hint: On my research why this happens, I came across an old Kodi forums thread ( MKV playback out of sync) which mentions similar problems. On the computer the video was perfect no audio/video sync issues there.
Interestingly this only happened, when the recorded episode was played within Kodi. Impossible to watch the recorded episode like this! However, whenever the video was paused and then played again, audio and video were in sync again - for a few seconds until the same happened. The longer the video was playing, the bigger the lag between audio and video was. It even became worse with every additional second. The sound seemed to come before the corresponding image (the video stream seemed to lag behind).
Once the recorded file was launched in Kodi and the episode started, it only took a couple of seconds to realize: There's an audio/video sync issue. I felt like a hero to present the recording to my wife: "See - there is at least one benefit of having married a geek!". As the episode we were about to miss was correctly recorded and saved as a Matroska video file (mkv), it was time to catch up.
#KODI TV TIME HOW TO#
In a recent article I described how to record films or series from TV using Tvheadend on Kodi/LibreELEC. Published on August 31st 2020 - Listed in Multimedia Kodi Kodi TV: Matroska video file (mkv) with increasing audio/video sync lag issue (solved!)
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