23.98 to 24 Audio Issue

[intomoviesplus]

I have a 23.98 prores going into DCP-O-Matic. The program balances it out to 24fps as is standard. However, the audio is ~very~ pitched down. Not comically so, but certainly it would not pass as natural.

I've never seen this issue before from Dcp-O-Matic, and from what I've read the common feeling is that, though technically this is a result of 23.98 to 24fps conversion, it is achieved with imperceptible or barely perceptible difference. Not the case here.

Tried a thousand things, maybe found a barely acceptable work around. Would love any options/explanations y'all have though.

The only reason I can imaging this is happening here when it never has before is that this is a 4k restoration file. Where the image has been scanned and digitally cleaned and all that, but the *audio* is an unchanged scan of the original stereo optical negative track. And that somehow, that analog baseline, without going through all the digital elements of restoration, is gumming up the traditionally seamless 23.98 to 24 pipeline.

Also, obviously, time sensitive as always lol.

[carl]

Perhaps you could attach the "log" and "metadata.xml" files from the DCP-o-matic project, or send them to carl@dcpomatic.com ?

[intomoviesplus]

Thank you Carl, files and updates emailed!

[Carsten]

Which version of DCP-o-matic do you use, and on which platform?

[IoannisSyrogiannis]

I wonder, if that is a restoration from a film scan, how does the audio end up on something else than 24fps?
Is it conformed in some way to 23,976?

If you are saying it was "~very~ pitched down", is there any chance that the conversion was not 23,976 to 24, but 29,97 to 24?
(That would be comically lowered in pitch, though. 25 to 24 would be less of a joke. Almost a semitone.)

In any case, I don't get how the unchanged audio scan is 23,976.

[cvila]

What is the audio sample rate of the original 23,98 Prores?
Maybe Dcp-o-matic is assuming something standard like 48.000 to do its processing and it's not the case.