Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Help Cinema DTS locomotive-like noise after 2 minutes?
#1
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
Reply
Thanks given by:
#2
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.
Reply
Thanks given by:
#3
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.
Reply
Thanks given by:
#4
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.
Reply
Thanks given by:
#5
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.
Reply
Thanks given by:
#6
(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.
Reply
Thanks given by:
#7
Okay, I'll do that when I feel a bit less lazy!
Reply
Thanks given by:


Possibly Related Threads…
Thread Author Replies Views Last Post
  CDS (Cinema Digital Sound) system overview spoRv 5 2,101 2019-11-28, 10:33 PM
Last Post: BDgeek
  The Past, Present & Future of Home Cinema. CSchmidlapp 26 10,237 2017-08-27, 03:46 AM
Last Post: captainsolo
  composite rainbow noise deblock 2 1,443 2017-03-24, 02:19 AM
Last Post: zoidberg

Forum Jump:


Users browsing this thread: 1 Guest(s)