Errorcode s1001 with some files

Server Version#: 1.14.1.5488
Player Version#: all players

PlexPlayer doesnt play some files, says “errorcode s1001”. Just some files (many), not all.
Server Log says:
MDE: track has no audio stream.
Streamin Recource: Cannot make a decision because either the file is unplayable or the client provided bad data.
Can´t be correct, direct acces via win10 with i.e. vlc is no problem, no corrupt files, no problem playing in os.
Already tried: Library scan etc.
Checked: Ownership and access rights in security (win10). Two files, of which one plays in plex, the other one doesn´t, have the exact same owner- and securitiy configuration.
Configuration: PlexServer running on Win10, Media is on a directory located on a synologyNAS, mounted as a network drive in win10, all wired LAN.
Years no problem, now suddenly some files (many) can´t be played with this s1001 errorcode.
Any ideas, help?

Try from the WebClient to run an analyse on one of the medias that fails to play

Thx! That solved the issue. I checked the codec plex identified and it turns out that its whatever but not a music codec… for many files. For example:

  • Codec TXT
  • Format TXT
  • Display Title unknown (TXT External)
    After analysing it´s correct identified as mp3 (or whatever music codec).
    So I have to check " in depth media analysis"… I guess.
    Thanks for the hint!

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