pub const AV_FRAME_DATA_SEI_UNREGISTERED: u32 = 20; // 20u32Expand description
User data unregistered metadata associated with a video frame. This is the H.26[45] UDU SEI message, and shouldn’t be used for any other purpose The data is stored as uint8_t in AVFrameSideData.data which is 16 bytes of uuid_iso_iec_11578 followed by AVFrameSideData.size - 16 bytes of user_data_payload_byte.