www.makemkv.com

I've done a little troubleshooting as I was coming into the same issue. Alien Romulus 4K (UK Disc): The issue occurs if I choose to convert the main 7.1.4 Dolby Atmos track to FLAC. The following error appears: FFMPEG_ERROR: FFDEC000: [truehd @ 0000018483C56AE0] quant_step_size larger than huff_lsbs...

I've recently purchased the Australian release for this, and after sending through the SVQ file last week the disc decodes fine but I'm also having the invalid mux messages when opening the decrypted image in MakeMKV. How do I find which file to send the first 64MB of?