The New_3DS Internet Browser uses mvd:STD with code which uses video-decoding related strings.
MVD Service "mvd:STD"
This one uses the I/O mapped @ 0x10207000.
This service is used by the New_3DS Internet Browser.
MVD Service "l2b:u"
This one uses the I/O mapped @ 0x10130000.
MVD Service "l2b2:u"
This one uses the I/O mapped @ 0x10130000.
MVD Service "y2r2:u"
This one uses the I/O mapped @ 0x10102000.