gst: try to purge buffers when renegotiating
Track dequeued buffer counts and ensure they are flushed before reconnecting stream.
When purging use empty buffers to try and push buffers we need to reclaim out of the pipeline.
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Track dequeued buffer counts and ensure they are flushed before reconnecting stream.
When purging use empty buffers to try and push buffers we need to reclaim out of the pipeline.