I have a 4K file of King Kong but it has the DTS:X track and I wanna use the original 5.1 track from the Blu-Ray. I know how to add the track to the file but the issue is that they’re both not the same length (it’s the theatrical cut btw). The 4K file takes a second to get to the logo while the blu-ray takes 2. The blu-ray also adds a MPAA sticker at the end of the film that the 4K didn’t have, accounting for the length differences. It’s hard to sync them and I don’t know any good software to trim the videos.