User Data Unregistered SEI Passthrough

Quadra supports passthrough of user data unregistered SEI payloads during transcoding for H.264 and H.265. This can be enabled by specifying the decoder codec parameter user_data_sei_passthru as per the following example:

ffmpeg -c:v h264_ni_quadra_dec –user_data_sei_passthru 1 -i input.264 -c:v h265_ni_quadra_enc output.265

This feature is intended for passing through small user data unregistered SEI messages up to 1024 bytes in size. For larger SEI messages please use the custom_sei_passthru option. For more details on user data passthrough please see the SEI Passthrough Application Note.