vorbis in mkv: seeking mutes sound
when seeking mkv that had vorbis I note mute in the sound, and it takes almost one second or sometimes more than one second, Could be up to five seconds
http://streams.videolan.org/issues/13575/%5bSuper_Down%5d_Sword_Art_Online_II_-07%5b720_10bit%5d_%5b1372C063%5d_(1).mkv