i am having a similar issue. all video, from all sources is unwatchable, it's not just slow and choppy. i get big block artifacts, like when a dvd is covered in dust. and i know the files are good, i copied the files from my computer to the sd ofthe raspberry pi 4. put the sd in the pi 4, tried to play a video, failed. i then placed the sd in my computer, and played the file from the sd card, and it looks just fine. on youtube, the video is just slow and choppy, but you can see the frames correctly. i've tried with different file types and codecs, and all have failed to play correctly. i've also tried all the solutions i'ev found. disable compositor, disable unused video outputs. disable all video outputs and play in vnc, increase the video ram ( i gave it 512MB at most) edit chrome config file for youtube. reinstalled raspbian, tried to play the file from an smb server.
any solution would be really appreciated.
thank you very much!