I heard good things about "it's playing", which is supposed to be very good at playing back all file formats.
I tried it with a few HD samples, and it really struggled whereas AVPlayerHD played them back fine, so I'd recommend that.
I've also tried Azul and VLC, both of which I found to be not as good as AVPlayerHD.
I tried it with a few HD samples, and it really struggled whereas AVPlayerHD played them back fine, so I'd recommend that.
I've also tried Azul and VLC, both of which I found to be not as good as AVPlayerHD.