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ndi: don't accumulate meta with audio only streams

François Laignel requested to merge fengalin/gst-plugins-rs:ndi-dont-pile-up-cc-meta into main

Currently, only closed caption metadata are supported. When the next video frame is received, pending meta are dequeued and parsed. If close captions are found, they are attached to the video frame.

For audio only streams, it doesn't make sense to enqueue metadata. They would accumulate in pending_metadata and would never be dequeued.

Fixes #460 (closed)

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