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78bc3d53dd
A payload of 0x80 0x80 means that it's padding. It's not a good idea to throw this away though, because of the cc_valid field. According to CEA 10-B section 25.2.1, if cc_valid is zero, the run-in clock and start bit should not be generated. In practice, this means that any closed captions will be erased and the end-user TV will show that captions are not available for this stream. This might have undesired consequences, e.g. we were just showing a long line of captions and we disable it before the user has had time to read it, or you can't enable closed captions during silence/music intervals. We cannot reliably detect whether there's a currently-silent closed caption stream or just nothing, but we have this information coming from upstream, so we can at least not discard it. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5508> |
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