* @brief Serialize a prepared coded bitstream unit with an existing context. * * @param cbs_ctx Coded bitstream context initialized for the codec. * @param nal NAL unit type to insert into the fragment. * @param uh Pointer to the FFmpeg raw unit header/content structure. * @param codec_id FFmpeg codec identifier used by the context. * @return Serialized NAL unit bytes, or an empt
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