As someone who doesn't know too much about video editing and conversions etc, I've done a lot of reading on the subject on these forums which have been most helpful. It seems to me that the easiest way to convert Blu Ray mks files to m4v is clipwrap or subler. I tried subler and was most impressed by its ease of use, speed and the fact that there's no re-encoding so there's zero loss of video quality. Now the audio options are different nightmare. After reading about Dolby Pro Logic 1 & 2, AAC, AC-3 etc. I'm still no clearer in understanding which one offers the best sound quality for people like me - i.e. the highest available sound quality for regular stereo sound systems. I understand that the various Dolby options offer better or worse implementations of surround sound etc. I'm sure that the vast majority of home users don't have 7 let alone 5 speaker surround sound systems, so I'm sure that I'm not alone in just wanting the absolute best available stereo sound option from my Blu Ray movies. Hopefully some of our resident video experts can weigh in and offer suggestions for highest quality audio options needed for regular stereo. If I understand these things correctly I believe that converting Blu Ray DTS 7.1 audio to stereo should also greatly reduce the file size without sacrificing audio quality. Or is that another mistaken assumption? Thanks in advance for your help on this confusing topic.