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How to Fix the Problem of Audio not being in Sync with Video
https://www.videoconverterfactory.com/tips/audio-sync-problem.html#:~:text=Run%20this%20software.%20Select%20Converter%20and%20then%20click,Or%20directly%20drag%20the%20file%20into%20the%20software.
Audio sync issues with plex media player - Desktop Players ...
https://forums.plex.tv/t/audio-sync-issues-with-plex-media-player/175948
Otherwise you will see audio lip sync drift, as every 16.7s, frame duplication occurs. 30fps and 60fps content needs to be displayed at 60Hz and not 59.94Hz. Otherwise you will see audio lip sync drift, as every 16.7s, frame drops occurs. EDIT per @Warmongerx suggestion: PMP has two mechanisms to counter this issue.
Plex - Audio Sync Issue - Roku Community
https://community.roku.com/t5/Channel-Issues-Questions/Plex-Audio-Sync-Issue/td-p/545979
Plex audio works perfect on our Sharp Roku TV so it is unique to a software problem on the Ultra. The issue only happens with videos played via the Plex App, not Netflix or Disney just Plex. I'm tired of bad software updates and then slow fixes from Roku. The Plex audio sync problems has happened before with the Ultra.
Audio and Video out of Sync on Plex : PleX - reddit
https://www.reddit.com/r/PleX/comments/kh4103/audio_and_video_out_of_sync_on_plex/
One of the latest Plex Server updates recently broke audio transcoding pretty badly. Myself and other users on the forums are having issues with things transcoding to MP3 instead of AC3/AAC. Other's are reporting sync issues as well when seeing transcode to MP3. For me it's only 7.1 AAC that transcodes to MP3 on one Roku device.
Audio sync issues : PleX
https://www.reddit.com/r/PleX/comments/p0kelo/audio_sync_issues/
This has been an issue consistently popping up for years, particularly on Xbox consoles. For some reason and assuming due to recent update audio is painfully out if sync on nearly all movies. It's at a point this time of being unwatchable. I have a mixture of 1080p and 4k content.
Audio constantly going out of sync : PleX
https://www.reddit.com/r/PleX/comments/3nyjdg/audio_constantly_going_out_of_sync/
If you see that Plex Transcoder (or similar) is running heavily, then the issue is most likely that Plex is transcoding the 5.1 surround-sound audio to 2.0 stereo, and struggling to do so. You may want to try changing your bitrate settings in the Plex app (if that's even possible - I use Roku and it's a choice in the menu) to somewhat reduce the quality so that transcoding is easier.
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