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This commit adds a repeat_headers setting which will allow sps/pps repetition and AUDs(access unit delimiters) . Repetition is ensured by h264config->repeatSPSPPS & h264config->disableSPSPPS; the two parameters are set by nvenc to true on default. When video headers repetition is required, we set the second in jim-nvenc to false so that SPS/PPS are written into bitstream. The first parameter could be omitted but is exposed since repetition of video headers might not be required. When headers repetition is enabled, we also enable AUD to facilitate decoding. Typically the video headers repetition will be useful for mpegts and DVB broadcast decoders.