Somehow, between two computers, I found I could not hear the audio on some of my raw video files with one computer, but I could hear it on the other. I imagine I messed up the codecs on one of the computers so they wouldn't play. Other raw video sounded fine, even raw video recorded with the same camera as the files that wouldn't play. I tried various players (WMP, for example) with the same results. I'm not sure anyone can tell why this is. But here's my main question:

When I edited a project that contained combination of raw video that I could hear and raw video that I could not hear, Video Factory would not play the sound from the problem files either, while other files included would sound okay. But when I tried to play the rendered project, the same sections that I could not hear in the raw video could not be heard in the rendered video, and what could be heard in the raw video sounded okay in the rendered video. What's going on? Does the rendered video contain different audio encodings, same as the source, and change as the source encoding method changes? (I still can't figure out why more recent recordings from the same camera can be heard but some taken earlier can not be heard.)

How does rendering encode the sound?

I rendered to .avi DV NTSC format.

Thanks