There are many variants of this player ( BD-370 V/N/S ). In Europe and Brasil this player is capable of decode DIVX, MKV, H264, burned in medias or stored in pen drives or removable USB HDs.
Mine plays AVCHD flawlessly. I have converted some mkv movies to AVCHD using Tsmuxer.
As I know north american version of BD-370 doesn't play H264.
You tube connection is useful too.