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V4L2 buffer queue orphaning

Philipp Zabel requested to merge pH5/gst-plugins-good:v4l2-orphaned-bufs into master

Recent kernels allow REQBUFS(0) on a queue that still has buffers in use (mmapped or exported via dmabuf), orphaning all buffers on the queue. If this is supported, the v4l2videodec element does not have to send a drain request downstream. This allows to switch resolution of a decoded string without having to wait for the sink to return the last shown buffer of the old resolution.

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