2023-07-10, 01:57 AM
This is a shot in the dark. Did you use an AMD card to encode your media? When I upgraded from a GTX 1070 to a RX6800 all the videos I recompressed with the RX6800 had the problem you are describing with chapter image extraction. I had to go back and re-encode everything with an Nvidia card to resolve this error and get chapter image extraction to work.