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I fully agree, FWIW. Unfortunately people still do it.
The problem isn't the total size of the DPB (although it can be on cards with only 256MB), it's mainly due to windows/DXVA only allowing a DPB made up of 16 frames. In theory this is ok since non-ref B frames can bypass the DPB but this isn't how the nvcuvid decoder works - every frame is decoded via the DPB and if there's no free slot (all filled with reference frames) artifacts show up.
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