Investigate Media Information and Formats | Plex Support
Why does Plex can't recognize MP4 video file? | Media Compatibility Solutions
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Why is it converting MKV to MP4? Haven't had this issue before. (2020 i3 MacBook Air) : r/PleX
Is this transcoding normal? Why is PLEX converting a MP4 to MKV and using OPUS Audio format when playing remotely to an iPhone? I thought iPhone could play MP4 natively? : r/PleX
What if Plex Server Doen't Find/Recognize some MP4 files?