Avid Media Composer H.264 Export
From MediaArts KB
Avid Media Composer v8.7.2
Problem: When exporting H.264 files from Avid Media Composer, the progress bar appears to encode the file four times before finishing.
Solution: Avoid using the "Best quality (Multi-Pass)" option in the Quicktime compression settings dialog box. The multi-pass export takes four times longer to do and results in a file that doesn't look any different than the one created using "Faster encode (Single-pass)".
Step by step H.264 exporting:
1. Select the sequence in the bin and from the File menu select Output>Export to file...