The intro video crackle is a known issue. If you do keep having these audio stuttering, you might want to use LLE instead. But do keep in mind that LLE will drastically reduce your performance (depending on the game).
As for your clearing cache message: try deleting everything in the folder User\ShaderCache.
If everything else fails, download a newer version of Dolphin, and see if you still crash.
As for your clearing cache message: try deleting everything in the folder User\ShaderCache.
If everything else fails, download a newer version of Dolphin, and see if you still crash.