decoder: pause aout at creation in corner case (fix #6369)
If pausing the decoder races with setting up the audio output pipeline, the decoder can end up already paused when the audio output is created. The audio output insists on a strict start -> (pause -> resume ->)* (pause ->)? stop series of state transition. So it must be paused explicitly in this corner case. I have not investigated whether this problem affects the video output but this seems very likely too.
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