Re: How to avoid clip overlap

for the AC3 you can use the setting of 192 the bitrate pertains to the video side and it is determined by the time length of the project. For example a 60 minute project using AC3 audio (DVDArch preferred type of audio and it is also a smaller file) using a variable bitrate would be set at 8,000,000-8,000,000 and for the low end I alsways set mine to 2,000,000.
For a 120minute project using AC3 audio the bitrates would be (high)8,000,000 - (average) 4,826,000 and (low) 2,000,000.
If you use the proper bitrate the video will be fine. As for rendering 2 times well you are but you're not. You are rendering twice but once for the AC3 audio and once for the video at the correct bitrate. AC3 renders very very quickly so it's not a gruesome job.
HTHs
Don