I added my codec licenses for MPEG2 and VC1 yesterday, and noticed a movie was stuttering like crazy.
Just hooked up a keyboard and noticed the movie was encoded in VC1 (remux from a Blu-ray) and decoded in SW, instead of HW like a movie encoded with h264.
Logging in using SSH I can confirm the codecs are disabled, even though they exist in the config.txt.
QuoteLibreELEC:~ # vcgencmd codec_enabled MPG2
MPG2=disabled
LibreELEC:~ # vcgencmd codec_enabled WVC1
WVC1=disabled
LibreELEC:~ #
I can't even find the codecs on a shop like The Pi-Hut, so aren't they sold anymore?