ROTJ SE cinema DTS synchronize help

Anakin94 said:

Hey,
i wanted to sync the german cinema DTS audiofiles for the ROTJ Special Edition.
The video is from the Gkar release.
I cutted the 7 audio reels good as i can.
But i have 4 problems.

1. The framerate.
   The DTS files doesn’t seem to be 23,976 or 24,00 fps.
   It’s more like between 23,998 and 23,999 fps.
   Why is this happen, is that a known issue?
   And also every reel seem to be a bit different.

2. Did i have to stretch the audio with pitch correction, so that the pitch be same as before stretching?

If it were me, I would go with the easiest and match the duration of the DTS audio files to 23.976fps. I would use the audio from the 2011 Blu Ray cut as a guide to sync up the speed of the DTS audio, because

alexp120 said:
Both the 1997 and the 2011 Blu Ray cuts are of the same length for the first 2 hours, 5 minutes and 55 seconds. It is when you reach the Victory Celebration that the cuts go out-of-sync with each other as the 2011 cut adds 5.626 seconds during that sequence–it would be in the Naboo footage where a gungan says, “Me’s a free!”.

Then, check the frame rate of the Gkar version—you can use the free app, MediaInfo. If it is at 23.976fps, then all you have to do is mux the audio and video together and you should be good–again, presuming that the Gkar version is 1997 frame-complete.

As for pitch correction, there will be a change in pitch when you alter the speed of audio, but the difference in how the audio sounds between 23.999fps and 23.976fps is not really very noticeable.

Anakin94 said:

With AudaCity i can only adjust in 0,001% steps and this is not accurate enough.

How ‘not accurate’ are we talking about?

When you are using Audactiy and lining-up the two files—a reel from the DTS audio file and 1997-reference audio file—how ‘out-of-sync’ is the DTS audio file away from the 1997 reference audio file?

Bear in mind that one film-frame is displayed at approximately 42 milliseconds when projected at either 24fps or 23.976fps. So, if both audio files start at the same time but the DTS audio drifts out-of-sync by more or less than 42 milliseconds by the end of one reel, then you have a problem where you will notice the audio being out-of-sync with the frames. So your goal is to use Audactiy to adjust the duration of the DTS audio to be as close to the reference audio as possible—well below 42 milliseconds. For example, if the closest that Audacity can get to encoding the duation of the DTS audio to match the duration of the reference-audio is 20 milliseconds behind the reference-audio, then I would slide the encoded DTS audio so that it starts 10 milliseconds after the start of the reference audio and ends at 10 milliseconds before the reference audio. And you would be doing that for each audio reel. When you are watching the film with your edited audio-track, your brain won’t notice the 10 millisecond out-of-sync error.