Hi, I wanted to convert an UHD disc to BluRay that was formerly converted to fit a 50Gb disc. I get immediately an error message for the NVIDIA conversion. I do it right now - slowwwwly- decoding via the CPU and encoding via NVIDIA GPU. That works w/o errors. There must be something fishy the decoder doesn't like with files produced by the NVIDIA encoder. The disc is Apollo 13. I will check later if that's the case also with other compressed UHDs. I know that BluRay conversion always worked from the original discs.