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cccombiner: expose preserve-caption-meta property

Mathieu Duponchelle requested to merge meh/gstreamer:cccombiner-passthrough into main

It can be used to discard closed captions from the input pad if the matching video buffer already held closed captions.

It is useful in a scenario where captions are generated for an AV stream, but the incoming stream already has embedded captions for some intervals, and those original captions should be preferred.

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