normalizing audio volume on movies

Dear Lazyweb,

How do I normalize the audio volume of a bunch of MOV and MP4 files?

The "Sound Check" option in iTunes works passably well for MP3 files, but doesn't do anything for videos. This makes it annoying to use a playlist full of music videos as a source of ambient entertainment, since the volume fluctuates wildly.

(Only slightly surprisingly, iTunes doesn't use the RVA2 ID3 tag used by normalize, but instead uses a COMM/iTunNORM tag.)

I think that a solution involving manually pulling the audio out of the movie files, normalizing it as a WAV, and re-inserting it into the movie is probably doomed to synchronization errors. So let's not.

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