Can one change the sound codec used when rendering for DVD output. At this stage mine only has PCM as option. My output size grows from 700mb to 1.2GB from before rendering to burned onto DVD. I suspect it's the sound compression. I heard a lot about AC3. What is it? Is there a way to increase the amount of footage I get onto a DVD? (only getting a film of 60min on a 4.7GB 120min DVD-r) Is what I'm getting normal? All my settings are on high/100%/DVD quality. Any help??