Andrea Giuffredi is a very fine Italian trumpet player with a series of YouTube videos with exercises and backing tracks. You can put them on, listen to Giuffredi play the exercise, then play the exercise back. Here’s an example, which conveniently is a series of exercises based on octave slurs. Octave slurs are useful for guessing a player’s embouchure type because the interval is large enough that you can usually spot the embouchure motion fairly easily. Take a look at this video and see if you can guess his embouchure type. My guess is after the break.