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Originally Posted by Audionut
With adaptive b-frames enabled, the number of b-frames becomes the maximum number of b-frames that the encoder can use.
The encoder will then use however many b-frames it thinks are best.
Obviously with the content you are encoding, more b-frames is good.
Without adaptive b-frames, if you specify 2 b-frames, that is how many will be used.
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Why you say more b-frames is good for my content? Though the bitrate decreased a lot, but the PSNR also decreased by ~1.0. (Though no obvious visual decrease...)