EDIT Ok, apparently I've fixed the audio issue via my blu-ray player's settings. ----- So my second question was I'm burning mkvs as avchd for my blu-ray player. But the eps are 1-1.5gigs a piece, and it seems I can only do one at a time (the files and folders always want to overwrite otherwise). Instead of using like 12 dvds is there a way to burn multiple episodes per disc? And last but not least, my username should be Cerpintine instead of Cerpintin. Could a mod or somebody kindly fix it? I missed a keystroke on signup...
I use Nero Recode to add on my episodes onto one ISO file, then maybe DVD Shrink them if they are too big for burning onto one DVD. Nero is not free, but you can get the trial for something like 15 days. There maybe other programs which will do the same but I find Nero useful for title menus and all that.