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gstavviddec: Only allow a single closed caption meta

Vivia Nikolaidou requested to merge vivia/gst-libav:single_cc_meta_libav into master

Following discussion in gst-plugins-bad!1396 (comment 556068)

While it is technically possible to store multiple closed caption metas in the same buffer, we don't currently do that anywhere and for H264/MPEG2 both parts have to be stored in the same packet, and also the number of CC bytes you can store per frame is rather limited. This restriction might be relaxed later once we figured out how to do it without breaking things.

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