Firefox missing something for particular media formats.

Code:
[Child 1326,\
 MediaDecoderStateMachine #1] WARNING:
  Decoder=5ac6ffbe2400 Decode error:
   NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) -
    Error no decoder found for audio/mp4a-latm:
     file firefox-152.0.3/dom/media/MediaDecoderStateMachineBase.cpp:168

This happens on several Youtube videos. The problem is solved if I install a more recent multimedia/x264 version but that comes with way too much dependencies for this system. I think 1 of them is outdated but not x642 itself... What program or configuration am I missing?
 
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