Film-Tech Forum ARCHIVE: LOTR 2 SRD problems

This is topic LOTR 2 SRD problems in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Michael Rourke (Member # 1142) on 12-17-2002, 04:45 PM:

I just checked my print of LOTR 2 and the SRD sounded warbled on all the HF background noise, and or music. I have a DTS in this house also and I have to run a midnight show tonight. Did anyone have any problems with their DTS?

Posted by Josh Kirkhart (Member # 1046) on 12-17-2002, 05:01 PM:

dts is great on my print

Posted by Tom Wienholt (Member # 1510) on 12-18-2002, 01:21 AM:

The warble in your sound is probably from the flywheel on the soundhead. It probably is loose on the shaft so it is not spinning as it should. Also, make sure the dampening arms are working properly and that there is proper tension on the film when threading.

Posted by Mark J. Marshall (Member # 1409) on 12-18-2002, 12:42 PM:

I think he means that the DIGITAL track sounded warbled. Which should have nothing to do with tension on the flywheel. With digital, you either have sound or you don't. It shouldn't suffer from the same analog anomolies like warbling.

Michael, any chance the digital wasn't playing and you were listening to the SR track?

Our DTS is fine btw - actually, it sounded GREAT!

Mark

Posted by William T. Parr (Member # 677) on 12-18-2002, 04:30 PM:

Had no problems with LOTR2 in my DTS house. I am also playing one in SDDS but left before the sneak of it ran last night.

Posted by Joe Redifer (Member # 3) on 12-18-2002, 05:03 PM:

My CDS print sounds fantastic! I think as many people as possible should comment on the different sound formats OTHER than Dolby Digital before addressing Michael's original question! [Smile]

Posted by Aaron Sisemore (Member # 145) on 12-18-2002, 05:10 PM:

quote:
With digital, you either have sound or you don't. It shouldn't suffer from the same analog anomolies like warbling.

Take a SRD or DTS (never experienced this with SDDS so I cannot say it happens with it) movie, pull a loop of film out between the reader and projector (while movie is running) and then pull that loop out a bit faster than the film pays out. The sound WILL change in speed, and the film WILL remain in digital*.

I also had a reel 1 and 5 of Empire Strikes Back:SE that wowwed and warbled in all kinds of crazy ways when playing in DTS, all the while remaining in digital. Replacing the reels cured the trouble.

*I did the above experiments with DTS 'Buzz & Bill' and Dolby 'Jiffy' films. Do not try this with a release print... [Big Grin]

-Aaron

Posted by Mark J. Marshall (Member # 1409) on 12-19-2002, 09:50 AM:

quote:
*I did the above experiments with DTS 'Buzz & Bill' and Dolby 'Jiffy' films. Do not try this with a release print...

Oh, why not??? [Wink]

That's interesting if that's the case. So if you inject bits into the reader faster then everything speeds up?

I never would have thought that to be the case. Very interesting.

Posted by John Hawkinson (Member # 1135) on 12-19-2002, 11:00 AM:

If you think about it, some sort of system like this has to be necessary -- since the projector does not run at exactly 24fps, and perhaps might even vary over time, digital sound position needs to track the film position, and the only way to do that reasonably is to track its rate.

Of course there can be smoothing functions, but eventually, it either has to speed up/down or skip.

--jhawk

Posted by David Stambaugh (Member # 1102) on 12-19-2002, 06:20 PM:

This writeup on SR-D (by John Allen; PDF format) mentions the need to accommodate variations in projector speed. Kind of interesting. There are CD players with "pitch controls", but don't they really control the tempo, not the pitch? Presumably the SR-D data rate can vary between some defined +/- n% of ideal and not affect playback except for a slight change in "tempo". ?