This project is in the homestretch, with subtitles, chapters, and the edit all complete!

I just have a technical question that I hope someone here can help me with:

I’ve noticed duration discrepancies between Premiere Pro and media players like VLC, and I think it has to do with timecode. For example, my Blu-ray copy of the Last Jedi (completely raw rip from disc, no re-encoding) has a total duration of 2:31:42 in Premiere and After Effects. In VLC, Blu-ray player app, and iMediaHUD, the duration is 2:31:51. So the non-editing apps say the film is 9 seconds longer than in Premiere. The frame-rate reads as 23.976 in all of these applications, and those have been my settings through the entire project workflow.

This is an issue because the Chapters XML from the disc conforms to the longer duration timecode (the one seen in VLC). So when I edited the Chapters XML to conform to my edit using the timecodes out of Premiere, the timing was off (the End Credits chapter mark was about 9 seconds before the actual end credits hit).

And here’s the kicker: if I switch the timebase in Premiere from 23.976 to 24 even, the total duration of my Premiere sequence matches the longer durations in VLC and iMediaHUD (2:31:51 for the raw unedited Blu-ray).

So, is VLC and the Blu-ray app simply displaying a 24 timebase instead of 23.976? If so, why would the chapters XML conform to that timebase instead of the frame-rate of the video (which always reads 23.976)?

I see this discrepancy on every single version of the film I have: original Bluray disc, Hal’s TLJ:Legendary, and my latest export of workprint 2. I’ve not had any audio sync issues, either. It’s only really an issue with making the Chapters XML. I can easily work around this, but I don’t like seeing discrepancies and a lack of continuity between apps. So any guidance would greatly appreciated!

Thanks so much in advance!