I have several very large avi files (10g) that I need to turn into a 3 minutes time lapse of a construction project. I've tried to render small pieces at a time to MP4 but I'm still having issues with performance and ending up with black screens. I let one rendering go almost 2 weeks. I'm clipping large sections out of the avi and I'm speeding up the clips to 50X. What are the resource hogs that I can avoid on the first pass while converting from avi to mp4. I'm happy to put multiple mp4's together later.