Is it true that MPEG-2 is the best format to render HD video from Sony Vegas 8 for Blu Ray playback? I used to render to AVI, but the files are massive. Also, do I need to render the audio separately, and is AC3 the best choice for this? DVD Architect 5 seems to find the audio file when it is in the same folder as the MPEG-2 file and has the same name. Is this the best workflow? Thanks for your help.