In the video, it sounds like the engine is lugging from being in too high of a gear for the rpm vs load. Don't know about the A8, but this is one of the things I don't like about automatics, they tend to not downshift in situations like this. Sometimes you have to either blip the throttle a little bit, or let off completely for a second to coax it to downshift. Or use the paddle shift to down shift.
Didn't hear anything weird at idle, just the engine purring.
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