Bytales, I know what you're saying, and I too used to like to get pixel-perfect things. But on-device scaling at runtime is pretty good these days, and even if you found out the exact dimensions to use for this player, if you changed to a different player it might display the cover art at a different size anyway, so it seems a bit over the top to hard-wire or optimise your cover art just to suit this one player. Just put the cover art in at any resolution you like and it'll probably work. In relation to the size of the music file, the cover art will be miniscule (just a few dozen kilobytes at most).