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nvdec: Don't hardcode DPB size

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:nvdec-dpb-size into master

Too many decode surface would waste GPU memory. Also it seems to be introducing additional latency depending on stream. Since nvcodec sdk version 9.0, CUVID parser API has been providing the minimum required number of surface. By using it, we can save GPU memory and reduce possible latency.

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