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Cinema DTS locomotive-like noise after 2 minutes?

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I got a few Cinema DTS discs and on one of them, in each file after precisely 2 minutes a locomotive-like noise comes in, garbling the audio and making it unusable.

Any idea what this might be?

It does not occur in the trailers-file, only in the main files.

Update: Here's a short example of what I mean: https://www.sendspace.com/file/qzmk1y
(This post was last modified: 2017-12-09, 12:35 AM by TomArrow.)
That is not a locomotive noise, it is a fast forward/skipping audio noise. Are the audio files .aue as I suspect they are? If so, they aren't decoding due to the protection on those discs.
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(This post was last modified: 2017-12-10, 04:28 PM by Jetrell Fo.)
The files were .apx files. I renamed them to .aud. The first 2 minutes always decode fine, afterwards it's all full of this. You think anything can be done about it? I googled and the movie is from 2011, so you may just be right about the encryption.
Tom, what film is it? We may have to find a way to do this.

Smile

From the Film-Tech Forums:

I think APX was the file format for a disc watermarking system that was being tested back then. The discs were individually watermarked, so that if there was a pirated copy of a movie that surfaced on the internet, and the audio was captured from a DTS disc (either by recording in the auditorium or tapping the analog output), a forensics team would be able to identify which disc was used on that playback.

It was pretty cool technology, but in the end cost prohibitive and never saw a rollout.
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(This post was last modified: 2017-12-11, 02:39 AM by Jetrell Fo.)
It should be Kung Fu Panda 2. It's definitely some Kung Fu Panda going by the first 2 minutes of the reels, but I don't know the movies enough to verify whether it's part 2.

Interesting. Though I doubt this noise is purely watermarking, as it is .... fairly audible. Big Grin Fairly strongly audible.
(2017-12-11, 02:52 AM)TomArrow Wrote: It should be Kung Fu Panda 2. It's definitely some Kung Fu Panda going by the first 2 minutes of the reels, but I don't know the movies enough to verify whether it's part 2.

Interesting. Though I doubt this noise is purely watermarking, as it is .... fairly audible. Big Grin Fairly strongly audible.

If you want to send me the audio via WeTransfer I can check it out.
For new members: Please do not ask where to get something. Participate in the forum, talk to people, make friends. Then someone will help you find what you want.
Okay, I'll do that when I feel a bit less lazy!

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