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nvdec: Add support for runtime output memory type change

Seungha Yang requested to merge seungha.yang/gst-plugins-bad:nvdec-dynamic-change into master 
nvdec: Fallback to system memory if OpenGL context could not support PBO memory

If the environment could not support OpenGL PBO memory, nvdec will do negotiation
with system memory as fallback.
nvdec: Add support dynamic output format change

Implementing ::negotiate() method to support runtime output format
change. If downstream was reconfigured, baseclass will invoke
::negotiate() method, and nvdec should update output memory
type depending on downstream caps.
nvdec: Re-negotiate whenever output format is changed

Input stream might be silently changed without ::set_format() call.
Since nvdec has internal parser, nvdec element can figure out the format change
by itself.
tests: nvdec: Add test runtime downstream reconfigure

Add test case for output format change

cc: @billylindeman

Edited by Seungha Yang

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