Recently while working on a DVD project I ran into a very interesting challenge. I mixed all my audio in FCP, compressed my file audio and video files in compressor and burned them to a DVD.
When I played the DVD in my set top box, I realized the audio was very low; in fact I could not even turn it up with the use of my volume control. I was confused because I knew I had spent hours mixing the audio, and removing peaks.
Lucky for me, I knew whom to ask. I posted the question on the Apple discussion forums and several of the more experienced audiophiles gave me my answer.
Apple Compressor used dialogue normalization presets for the AC3 audio package. These presets are designed to keep a stable audio level through out the program. Stable audio level and specific dialogue normalization parameters are essential in TV broadcasting, however for film content or web content, the rules are not as strict.
The solution was easy:
1. Create a copy of the AC3 preset
2. Attach the AC3 preset to your file that is ready for compression
3. Select the AC3 preset that is attached to your file, an option window will open up.
4. Change the dialogue normalization to -31 and then change the compression preset to none
5. The audio after compression should be identical to the audio in FCP
6. Test the DVD across multiple players.
David W. Williams, a independent filmmaker in Tampa, FL created this blog to network with fellow independent filmmakers, to share information about independent film with independent filmmakers, and those who have an affinity for indie film.
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