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Audio Issues With Just Some Blue-ray Movies

post #1 of 7
Thread Starter 
I believe I have arrived at the conclusion that I may just need to upgrade my receiver, however I wanted to find out first if there is a way to solve the problem I've encountered, or at least understand why it is happening. It seems my receiver doesn't like SOME of the audio running to it from my Blue-ray player. I'm not sure why, but perhaps someone here will know what's going on.

I have a Pioneer Blue-ray player (BDP-51FD, in case it matters), an older Technics 5.1 receiver that supports DTS and Dolby Digital and has always sounded awesome to my ears (as do the speakers), at least. I run my HDMI cable directly to my HD Samsung LCD (on which I turn the sound all the way down), and run my audio through a coaxial cable attached to the receiver. I have a 5.1 speaker setup.

The audio and surround sounds just awesome when I play some Blue-ray discs and pretty much any DVD. Blue-ray movies such as Underworld and Interview with the Vampire sound great, but the Blue-ray audio on The Curious Case of Benjamin Button and now John Adams features voices that have a strange warble. The soundtracks sound alright, but the voices have this very distinct warble, much like you might sound if you were to speak through a slowly spinning fan. I can discern what the actors are saying (most of the time), but they are alien, and of course, annoying.

Now, this is VERY strange to me, as it only happens with some Blue-ray movies and not others. The problem (the warble voices) seems to be exacerbated by actors with lower-toned voices; they sound even worse.

Any idea what may be going on? Why? Do you suppose a new receiver with HDMI inputs would solve this issue? (Not that getting a new receiver would be a bad thing.)

Thank you very much for any advice you can provide.

- Scott
post #2 of 7
Thread Starter 
Please? Anyone with ideas? Thoughts?
post #3 of 7
If you turn the receiver all the way down and the TV sound up, do you still have the same issue?  If so, there could be a defect with the discs.  If not, the issue may have to do with copy protection or with the wiring.

Connecting your Blu Ray player directly to your receiver via the optical or coax digital connection is better than sending your TVs red-white audio out to the receiver.  If your receiver doesn't have a optical or coax audio input, then connecting the 2-channel red-white audio out from the Blu Ray directly to the receiver is still better than looping the Blu Ray audio through the TV back into the receiver.
post #4 of 7
Your BD outputs DD and DTS, but at higher bit rates than most DVD's.  Your receiver may be having problems with this.

Any pattern to which ones won't play (all DTS HD or DD TrueHD)?
post #5 of 7
From the titles you mentioned, it seems to be happening on Blu-rays with DTS-HD MA soundtracks. Your Blu-ray player is likely bitstreaming the legacy lossy core soundtrack, which is encoded at the higher 1.5 Mbps rate.

Do you have any DVDs with DTS soundtracks, but are encoded at the higher 1.5 Mbps rate (rather than 754 kbps)? I would check to see if these discs have the same problems.

If so, it is likely, as David indicated above, an issue with your older receiver having problems with the higher bitrates. The good news is that nowadays you can find some decent receivers that can handle the newer, lossless codecs (Dolby TrueHD and DTS-HD MA) for well-under $500.
post #6 of 7
Thread Starter 

Thank you for your replies.

I think you collectively may have hit the nail on the head, or at least the evidence seems to point in the direction of my older receiver simply not handling lossless audio. Here is the breakdown of the type of audio on each Blue-ray disc with which I had issues or sounded fine:
 

John Adams -- DTS-HD High Res Audio (warble issue)
Curious Case of Benjamin Button -- DTS-HD Master Audio 5.1 (warble issue)
Underworld -- Dolby Digital 5.1 (sounded fine)
Interview With the Vampire -- Dolby Digital 5.1 (sounded fine)


To answer the one poster's question, the audio warble disappears when I turn down the receiver all the way and use the television's audio (ugh) instead, which has been my unfortunate quick fix.

I know I have had several DTS DVDs in the Blue-ray player so far that have worked fine, but I'm not sure if I own any with the higher 1.5 Mbps rate. I would love to troubleshoot that theory. How do I know which are encoded at the higher rate? Is there a good list or site somewhere you could recommend, or is it listed on the DVD box itself somewhere?

 

post #7 of 7
Scott,

Just to clarify, you are not getting lossless audio.  You are still getting to old DD and DTS.  They are sent at a higher bit rate than most DVDs.
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