eday_2010 wrote:
FINALLY!
I have discovered the problem with the drifting audio. The culprit was Premiere Pro. I decided to go back and drop my rendered m4v video files in a timeline, along with my rendered 5.1 wav files t osee what was going on. Viewing the timeline as close as possible - that is, at the frame-by-frame level - I noticed that about half of the 5.1 wav files that I dropped in would be two frames short in length. They were not rendered short, however. I could grab the end of the audio segment in the timeline and pull it to reveal the two short frames. If you have enough of these, you start to notice the audio drifting.
Why Premiere did this, I have no clue. But now I know to look at everything at the frame-by-frame level when laying out the audio for movies.
Ouch!!
Great catch!