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ndi: use v210 encoding for cc and attach to video frame

François Laignel requested to merge fengalin/gst-plugins-rs:ndi-cc-video-frames-meta into main

The NDI closed captions specifications 1 define a variation where metadata is attached to the video frame. This requires the AFD buffer to be v210 encoded. This commit applies this strategy.

Another difference with previous version is that when an error occurs while encoding or decoding a meta, next meta are also tried instead of failing immediately.

Receiving closed captions as a standalone metadata is kept for interoperability purposes. In this case, metadata is also expected to be v210 encoded.

Edited by François Laignel

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