I'm running Plex Media Server version 22.214.171.12466 on headless Debian 9.3 with packages up to date. (kernel 4.9.0-5-amd64).
Whenever I try to play a movie in the Web Player (v. 3.31.1) which requires transcoding it randomly fails to transcode it. I can reproduce the issue with multiple files, it seems that it is not related to bad file encoding. The fail may occur at all length of the movie and it seems to be totally random.
When the playback stops I seek back to play that part again and it will fail to play at the same second. If I seek forward within the buffered area then it will continue to play the movie. If I seek outside the buffered area then back to the problematic part then the server tries to transcode that part again and it succeeds to transcode it and it wont fail.
I will attach the log (DEBUG mode enabled). I have also made a video about the issue. The playback is on the left and the Plex Media Server.log is tailed on the right. Maybe it helps to find the problem if you see the log in real time.
I have found two errors in the log which concerns me:
WARN - NAT: PMP, got an error: Not Supported by gateway.
ERROR - [Transcoder] [dash @ 0x2115140] Cannot use rename on non file protocol, this may lead to races and temporary partial files
Any help would be much appreciated!