Hello,
Thank you for contacting us.
UniFab currently does not support converting HDR or Dolby Vision videos to SDR. HDR Upconverter AI is designed specifically to convert SDR videos to HDR and therefore does not accept HDR source videos.
To convert an HDR video to SDR, please first use another tool that supports HDR-to-SDR tone mapping, and then import the converted SDR video into UniFab for further processing.
Best regards,
UniFab Support Team