Just to close some kind of loop on this. I ended up downgrading back to the latest available kodi 18.9 as the issue was starting to become intermittent and frankly frustrating. I had tried most of the troubleshooting steps provided and found no consistent solution.
At this point the best i can point to is that something with this RPi4 combined with the latest LibreElec just was not happy playing videos. I appreciate the suggestions I was given 
Ah, that's a neat little tool. Here is the resulting link:
Looks like we do hit the consistent issue @ around `19:24`
[...]
2022-08-09 18:47:30.948 T:1013 DEBUG <general>: CVideoPlayerVideo::CalcDropRequirement - hurry: 0
2022-08-09 18:47:31.022 T:1003 DEBUG <general>: CVideoPlayer::HandleMessages - player started 2
2022-08-09 18:47:31.022 T:1003 DEBUG <general>: CVideoPlayer::SetCaching - caching state 3
2022-08-09 18:47:31.022 T:1003 DEBUG <general>: CDVDClock::SetSpeedAdjust - adjusted:0.000000
2022-08-09 18:47:31.022 T:1003 DEBUG <general>: CVideoPlayer::SetCaching - caching state 0
2022-08-09 18:47:31.022 T:1003 DEBUG <general>: CDVDClock::SetSpeedAdjust - adjusted:0.000000
2022-08-09 18:47:31.022 T:1003 DEBUG <general>: VideoPlayer::Sync - Audio - pts: 751488000.000000, cache: 320000.052452, totalcache: 800000.011921
2022-08-09 18:47:31.022 T:1003 DEBUG <general>: VideoPlayer::Sync - Video - pts: 751084000.000000, cache: 50000.000000, totalcache: 100000.000000
2022-08-09 18:47:31.022 T:1014 DEBUG <general>: CVideoPlayerAudio - CDVDMsg::GENERAL_RESYNC(750984000.000000), level: 99, cache: 515439.793452
2022-08-09 18:47:31.022 T:1014 DEBUG <general>: CDVDAudio::Resume - resume audio stream
2022-08-09 18:47:31.022 T:797 DEBUG <general>: ActiveAE - start sync of audio stream
2022-08-09 18:47:31.023 T:1013 DEBUG <general>: CVideoPlayerVideo - CDVDMsg::GENERAL_RESYNC(750984000.000000)
2022-08-09 18:47:31.023 T:1013 DEBUG <general>: CVideoPlayerVideo::CalcDropRequirement - hurry: 1
2022-08-09 18:47:31.168 T:797 DEBUG <general>: ActiveAE::SyncStream - average error of -11.074048, start adjusting
2022-08-09 18:47:31.168 T:797 DEBUG <general>: ActiveAE::SyncStream - average error -0.011548 below threshold of 30.000000
2022-08-09 18:47:31.295 T:970 DEBUG <CWebserver[8080]>: request received for /jsonrpc
2022-08-09 18:47:33.048 T:787 INFO <general>: Skipped 6 duplicate messages..
2022-08-09 18:47:33.048 T:787 DEBUG <general>: ------ Window Deinit (DialogSeekBar.xml) ------
2022-08-09 18:47:33.080 T:787 DEBUG <general>: ------ Window Deinit (Custom_1109_TopBarOverlay.xml) ------
2022-08-09 18:47:33.581 T:1013 DEBUG <general>: CPtsTracker: detected pattern of length 1: 41708.33, frameduration: 41708.333333
2022-08-09 18:47:33.751 T:970 DEBUG <CWebserver[8080]>: request received for /jsonrpc
2022-08-09 18:48:00.277 T:999 INFO <general>: Skipped 11 duplicate messages..
2022-08-09 18:48:00.277 T:999 DEBUG <general>: Thread JobWorker 3489100416 terminating (autodelete)
2022-08-09 18:48:00.277 T:997 DEBUG <general>: Thread JobWorker 3447136896 terminating (autodelete)
2022-08-09 18:48:00.277 T:998 DEBUG <general>: Thread JobWorker 3351671424 terminating (autodelete)
2022-08-09 18:48:00.278 T:996 DEBUG <general>: Thread JobWorker 3390202496 terminating (autodelete)
2022-08-09 19:24:23.918 T:1002 DEBUG <general>: CVideoReferenceClock: detected 2 vblanks, missed 3, refreshrate might have changed
2022-08-09 19:24:40.350 T:1002 DEBUG <general>: CVideoReferenceClock: detected 1 vblanks, missed 2, refreshrate might have changed
2022-08-09 19:24:56.281 T:1002 INFO <general>: Skipped 2 duplicate messages..
2022-08-09 19:24:56.281 T:1002 DEBUG <general>: CVideoReferenceClock: detected 1 vblanks, missed 2, refreshrate might have changed
2022-08-09 19:25:07.281 T:1002 INFO <general>: Skipped 2 duplicate messages..
2022-08-09 19:25:07.281 T:1002 DEBUG <general>: CVideoReferenceClock: detected 1 vblanks, missed 2, refreshrate might have changed
2022-08-09 19:25:17.313 T:1002 INFO <general>: Skipped 12 duplicate messages..
2022-08-09 19:25:17.313 T:1002 DEBUG <general>: CVideoReferenceClock: detected 1 vblanks, missed 2, refreshrate might have changed
2022-08-09 19:25:18.401 T:797 INFO <general>: Skipped 1 duplicate messages..
2022-08-09 19:25:18.401 T:797 DEBUG <general>: ActiveAE::SyncStream - average error -249.088625 above threshold of 200.000000
2022-08-09 19:25:18.403 T:797 DEBUG <general>: ActiveAE::SyncStream - average error -0.005292 below threshold of 30.000000
2022-08-09 19:25:18.501 T:797 WARNING <general>: ActiveAE - large audio sync error: -89456.936787
2022-08-09 19:25:18.913 T:1002 DEBUG <general>: CVideoReferenceClock: detected 1 vblanks, missed 2, refreshrate might have changed
2022-08-09 19:25:22.451 T:797 INFO <general>: Skipped 10 duplicate messages..
2022-08-09 19:25:22.451 T:797 DEBUG <general>: ActiveAE::SyncStream - average error -247.656294 above threshold of 200.000000
2022-08-09 19:25:22.453 T:797 DEBUG <general>: ActiveAE::SyncStream - average error -0.010460 below threshold of 30.000000
2022-08-09 19:25:22.546 T:1002 DEBUG <general>: CVideoReferenceClock: detected 1 vblanks, missed 2, refreshrate might have changed
2022-08-09 19:25:26.501 T:797 INFO <general>: Skipped 15 duplicate messages..
2022-08-09 19:25:26.501 T:797 DEBUG <general>: ActiveAE::SyncStream - average error -328.743563 above threshold of 200.000000
2022-08-09 19:25:26.503 T:797 DEBUG <general>: ActiveAE::SyncStream - average error -28.743563 below threshold of 30.000000
2022-08-09 19:25:26.551 T:797 WARNING <general>: ActiveAE - large audio sync error: -89637.091612
2022-08-09 19:25:26.679 T:1002 DEBUG <general>: CVideoReferenceClock: detected 1 vblanks, missed 2, refreshrate might have changed
2022-08-09 19:25:27.551 T:797 INFO <general>: Skipped 3 duplicate messages..
2022-08-09 19:25:27.551 T:797 DEBUG <general>: ActiveAE::SyncStream - average error -293.806190 above threshold of 200.000000
2022-08-09 19:25:27.567 T:797 DEBUG <general>: ActiveAE::SyncStream - average error -0.014524 below threshold of 30.000000
2022-08-09 19:25:27.679 T:1002 DEBUG <general>: CVideoReferenceClock: detected 1 vblanks, missed 2, refreshrate might have changed
2022-08-09 19:25:31.239 T:823 INFO <general>: Skipped 13 duplicate messages..
2022-08-09 19:25:31.239 T:823 DEBUG <general>: JSONRPC Server: New connection detected
2022-08-09 19:25:31.239 T:823 INFO <general>: JSONRPC Server: New connection added
2022-08-09 19:25:31.253 T:1253 DEBUG <CWebserver[8080]>: request received for /jsonrpc
2022-08-09 19:25:31.254 T:1254 INFO <general>: Skipped 2 duplicate messages..
2022-08-09 19:25:31.254 T:1254 DEBUG <general>: JSONRPC: Value does not lay between minimum and maximum in type playlistid
2022-08-09 19:25:31.279 T:1253 DEBUG <CWebserver[8080]>: request received for /jsonrpc
[...]Hello,
I have been using LibreElec on a Raspberry Pi for many years, most recently on a Pi4. Recently, I upgraded to the latest version of LibreElec/Kodi and have noticed something very strange. Consistently, after about ~40 min of constant playback, the audio starts glitching while the video starts speeding up as if it was 1.5 speed. This becomes the way playback functions until I fully stop the playback of the video and then restart the video. I first thought this was due to overheating but even after ensuring the temperature of the device was sound, this continues. Thining resources, I don't see a noticible load on the CPU, hoving around a ~2.3 during even 4k playback and memory usage is quite minimal, barely using near 1GB in a 4GB system. This seems to occur no matter the quality of the video, 1080 or 4k.
Of note, I have also observed this while watching shorter video files but in succession, making it a constant 40-ish minutes of playback. However, if I stop the stream and then start the next episode, the issue seems to not happen.
Below I just have basic informatoin of the Kodi version and kernel version. I am unsure where else to look as the log doesn't seem to push out any other information at the moment. Any help or suggestion on where to go from here would be greatly appreciated.
Thanks!
tablekodi:~ # grep Kodi /storage/.kodi/temp/kodi.log
2022-08-02 18:01:06.479 T:788 INFO <general>: Starting Kodi (19.4 (19.4.0) Git:19.4-Matrix). Platform: Linux ARM 32-bit
2022-08-02 18:01:06.479 T:788 INFO <general>: Using Release Kodi x32
2022-08-02 18:01:06.479 T:788 INFO <general>: Kodi compiled 2022-03-05 by GCC 10.2.0 for Linux ARM 32-bit version 5.10.95 (330335)
2022-08-02 18:01:06.479 T:788 INFO <general>: FFmpeg version/source: 4.3.2-Kodi
tablekodi:~ # uname -a
Linux tablekodi 5.10.95 #1 SMP Sat Mar 5 15:50:44 CET 2022 aarch64 GNU/Linux
