I’ve noticed that occasionally when resuming playback on a video, the audio sometimes is momentarily ‘muted’. I think there is a pattern to this on the testing I have done so far. There was a change done in Kodi (version 17 I think), where resumption of video playback was fixed to look for the previous keyframe as the resumption point (it used to look for the next keyframe). Here is the link from the libreelec forum, see post 1,244 concerning PR11713:- https://forum.libreelec.tv/thread/2156-8-0-2e-libreelec-8-0-for-s905-s905x/?pageNo=70
For example up until this change, if you stopped playback at 5:00, where the previous keyframe in the video stream was at 4:55 and the next keyframe was at 5:05, then when resuming playback, the video would start at 5:05 (5 seconds too late). After this fix, the video resumed at 4:55. With the vast majority of video streams it appears that the keyframes are very close to each other, and the time difference is negligible so you won’t notice any audio problems. I’ve found that very occasionally, the gap between keyframes can be several seconds, and what appears to be happening here is that whilst the video resumes at the previous keyframe, the audio seems to resume at the actual time playback was stopped. So, using the above example, playback between 4:55 and 5:00 would mean no audio was heard, and once we reached 5:00, the audio resumed. Audio and video are still in sync.
Phew, I hope that I’ve explained that clearly enough. I would think this is a very minor issue and was wondering if anybody else has noticed it. I’ve not bothered with logs as I’m not 100% sure if I’ve nailed down the issue. The trick is to find a video where you have a few seconds between keyframes (I don’t know how you find that out apart from trial and error).