In one example a device for decoding video data comprises a processor the processor being configured to: supplemental enhancement information SEI network bit stream abstraction layer NAL unit determines the SEI NAL unit type value indicates the NAL unit of the NAL unit comprises prefix SEI NAL unit prefix SEI message or a suffix suffix SEI message of SEI NAL unit; and based on the SEI NAL unit is the prefix SEI NAL unit or the suffix SEI NAL unit and the SEI NAL unit data. decoding the bitstream of the video data after the SEI NAL unit.

In one example a device for decoding video data includes a processor configured to determine for a supplemental enhancement information (SEI) network abstraction layer (NAL) unit of a bitstream whether a NAL unit type value for the SEI NAL unit indicates that the NAL unit comprises a prefix SEI NAL unit including a prefix SEI message or a suffix SEI NAL unit including a suffix SEI message and decode video data of the bitstream following the SEI NAL unit based on whether the SEI NAL unit is the prefix SEI NAL unit or the suffix SEI NAL unit and data of the SEI NAL unit.