Is it possible to use another source to fill in for the missing frames? I know the purpose is to preserve the film, but there are missing frames, which is unfortunate. It seems to be just under 5 seconds missing…could (gasp) GOUT frames upscaled be used to fill in these gaps? Obviously not a great solution, but would it be better than black frames to get it GOUT synced?
See my comment above about rate extention/frame blending. If that doesn’t work, I really think the best option for ‘viewability’ would just be to modify audio tracks as needed. Having our GOUT standard is invaluable for many projects. But if this (or the v1.5) is going to be people’s go-to copy to watch, I think it’s probably the way to go.
I do not think filling in with GOUT frames is going to be any less distracting than black ones. Duplicated frames could work for single ones dropped, depending on the shot, but I would not go beyond that.