SOLVED: "Playback failed due to a fatal player error." (Only in Firefox)

[altair]

Your CPU does not have much meaningful hardware acceleration.  In particular, Intel dropped QSV support for that CPU a long time ago.  You have to select VAAPI for hardware acceleration.

And you have to be careful with which codecs you enable for GPU accleration.  Both decoding and encoding.

https://en.wikipedia.org/wiki/Intel_Quic...d_encoding

Thanks for the reply friend, I have everything off on decoding HW decoding, i tried and switched from OSV to VAAPI as well as V4L2, nothing seems to work on Firefox and the mobile app, but chrome works flawlessly with everything. Hardware encoding seems to be doing all the work cause without it, the videos lag all the time, 1 sec of playing 5 sec of buffering.
 
Here is an image of the settings.