Playback Error on some movies

[TheDreadPirate]

Can you share your jellyfin and ffmpeg logs with us?  Post them to pastebin and link back here.

What are your server specs and OS?

For the record, VLC will power through corrupt files most of the time.  So a file playing in VLC is not a good indicator that the file is not corrupt, though I doubt your files are corrupt.  There is likely some other issue.

https://pastebin.com/1rMqwCx8
there's the error log I get for one of my movies

I'm running Jellyfin on a DS1522 Synology NAS. I'm using the community application version.

I see a DS1522+, can't find a non-plus.  Is that what you have?  If so, your log indicates you have QSV selected but the 1522+ doesn't have an Intel CPU.  It has an AMD R1600, which doesn't have an iGPU.