+1
In order for mp4 files to be compatible with iTunes (at least to sync to iPhone), the first track must be AAC 2.0. I have thousands of MP4s that I created using Handbrake that have (2) English tracks, first is AAC 2.0, second is AC3 5.1. Some clients (Roku I believe is one) correctly play the 5.1 track by default. Most others players play the first track listed by default (AAC 2.0 in my case). I agree there needs to be a setting to playback the 5.1 by default.
Automatically Set Preferred/Default Audio For Videos (audio format/codec) // mod: option to override
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