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I understand that the audio is reencoded or the core is used for BD5/9 for either Dolby or DTS due to size restrictions. In the second log I chose to keep the DTS core which is why it's "keeping original audio". I also switched to Decoding/Frame serving: DGDecNV hoping for a different outcome, not knowing at the time what happens over 8500. If the restrictions are removed at 8500 the bitrate should increase in my way of thinking. If I'm using a custom target over 8500 there should be no restrictions, but BDRB still thinks I'm using DVD-R/+R and decreases the bitrate?
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The bitrate is lower because the DTS audio is much, much larger. It has to lower the bitrate to make room for the larger audio.