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BluRay audio stuttering/popping

Original Message
Name: Derek111
Date: December 19, 2007 at 01:48:18 Pacific
Subject: BluRay audio stuttering/popping
OS: XP
CPU/Ram: Pentium M 780 2.26GHz
Model/Manufacturer: AOpen motherboard
Comment:

When I play BluRay DVDs on my computer, the audio will sometimes stutter/pop. The stuttering doesn't stop until I restart the computer.

Sometimes (rarely) the video will also start flashing like a freakin strobe light...though not always at the same time the audio stutters.

I have the latest drivers for my gear (X-Fi and Radeon 1950Pro), as well as the latest version of PowerDVD Ultra.

I moved the sound card to a different PCI slot which seemed to help a tiny bit...though that may have very well been my imagination. Thoughts?


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Response Number 1
Name: ranchhand
Date: December 19, 2007 at 07:02:00 Pacific
Subject: BluRay audio stuttering/popping
Reply: (edit)

I am willing to be corrected on this, but Blue Ray needs the 1080p platform to reproduce (same thing for HD also). If your monitor, cable (you will need HDMI cable outputs from your video card and HDMI input on your monitor also) and DVD player do not support this its not going to work. I have seen only one 1080p (progressive scan as opposed to interlaced scan,1080i)monitor advertised so they are not common.

Give a man a fish and you feed him for a day;
Teach a man to fish and you feed him for a lifetime;
Then industry pollutes the water and kills all the fish.


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Response Number 2
Name: jackbomb
Date: December 19, 2007 at 13:42:16 Pacific
Subject: BluRay audio stuttering/popping
Reply: (edit)

Derek111:
"Pentium M 780 2.26GHz"
Are you using this processor in the system you're playing BDs with, or is this for another PC, such as a notebook?
If you're using this processor, that may be the reason for the stuttering audio and abnormal video playback.

Unless you have a video card that can handle the full bitstream decoding of H.264/VC-1 video, which the X1950Pro does not, then you pretty much need a dual-core processor in order to play BDs or HD-DVDs.

ranchhand:
"I am willing to be corrected on this"

Then corrected you shall be. :P

"Blue Ray needs the 1080p platform to reproduce (same thing for HD also)."

BluRay will play back on any non-1080p system. It will just be down-scaled to fit the monitor. The absence of a 1080p monitor will not cause stuttering audio and flashing video.

"If your monitor, cable (you will need HDMI cable outputs from your video card and HDMI input on your monitor also) and DVD player do not support this its not going to work."

Actually, PC monitors and video cards are most likely to use HDCP-enabled DVI ports instead of HDMI. See, HDMI is more of a TV/set-top player connectivity standard than it is a PC standard.

But even if the video card and/or monitor doesn't support HDCP, the blu-ray disc should still play at a reduced resolution of around 900x500 (I forgot the exact figure). Or, if a standard analog VGA port is used, the BD will actually play at full 1920x1080 resolution, if the monitor supports that resolution.

"I have seen only one 1080p (progressive scan as opposed to interlaced scan,1080i)monitor advertised so they are not common."

Actually, PC monitors have been progressively scanned for a long, long time now! They don't even sell interlaced PC monitors anymore! The last time I saw an interlaced monitor was back in 1992, and even back then it was considered to be a bargain-basement-type thing.

THE MOVIE PC!
PIII 1.4 @ 1.66GHz, 158MHz bus, 512K L2 cache
2GB DDR-333
nvidia 7950GT AGP
X-Fi
1280x720 Optoma projector
JBL 5.1 amp/speakers
106 up-converted WMV-HD flicks


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Response Number 3
Name: Tubesandwires
Date: December 20, 2007 at 10:42:48 Pacific
Subject: BluRay audio stuttering/popping
Reply: (edit)

"Actually, PC monitors have been progressively scanned for a long, long time now!"

Not true. Progressive scanning is a recent feature.
However, it is true they've been non-interlaced for a long time.

.....

A side note

"....the latest version of PowerDVD Ultra."

FYI

I hope you installed that in the default directory it wanted to install itself in. If you didn't you may have a major problem if you ever Un-install it, if the Un-install is as poorly written as it is for PowerDVD 4. The Un-install for that version deletes everything in the destination directory you installed it in, the destination directory, and all subdirectories attached to the destination directory and their contents, whether they were installed by the program or not!


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Response Number 4
Name: jackbomb
Date: December 20, 2007 at 11:18:09 Pacific
Subject: BluRay audio stuttering/popping
Reply: (edit)

"Not true. Progressive scanning is a recent feature.
However, it is true they've been non-interlaced for a long time."

If a display is non-interlaced, then it is considered to be progressive. From Wikipedia:

"Progressive or noninterlaced scanning is any method for displaying, storing or transmitting moving images in which all the lines of each frame are drawn in sequence. This is in contrast to the interlacing used in traditional television systems where only the odd lines, then the even lines of each frame are drawn alternatively (each image now called a field) are drawn."

"Progressive scan (also known as: P-Scan) is used for most cathode ray tube (CRT) computer monitors, all LCD computer monitors, and most HDTVs as the display resolutions are progressive by nature. (Other CRT-type displays, such as SDTVs, typically display interlaced video only)"


THE MOVIE PC!
PIII 1.4 @ 1.66GHz, 158MHz bus, 512K L2 cache
2GB DDR-333
nvidia 7950GT AGP
X-Fi
1280x720 Optoma projector
JBL 5.1 amp/speakers
106 up-converted WMV-HD flicks


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Response Number 5
Name: Tubesandwires
Date: December 20, 2007 at 11:29:39 Pacific
Subject: BluRay audio stuttering/popping
Reply: (edit)

Wikpedia has posts that can be submitted by anyone and for that reason is not infallible.
E.g. just the other day I found Wikpedia info about about NVidia graphics chipsets that had omitted info about earlier 4X AGP chipsets also being capable of 2X.

I have never seen the term progressive scan used until recently.


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Response Number 6
Name: ranchhand
Date: December 20, 2007 at 12:25:53 Pacific
Subject: BluRay audio stuttering/popping
Reply: (edit)

Thanks for the corrections, guys; I was referring to the fact that a smaller LCD monitor rated as 1080p with appropriate resolution and HDMI inputs is still comparatively rare on the retail market, not the interlace/progressive factor.

Give a man a fish and you feed him for a day;
Teach a man to fish and you feed him for a lifetime;
Then industry pollutes the water and kills all the fish.


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Response Number 7
Name: jackbomb
Date: December 20, 2007 at 12:53:11 Pacific
Subject: BluRay audio stuttering/popping
Reply: (edit)

Tubesandwires,
The reason you don't often hear about progressive scanning in the computer world is because the term is mostly used only when discussing television sets. A non-interlaced PC monitor IS a progressively-scanned display, because is progressively draws one FULL FRAME after another, instead of drawing "every other line" of the image as interlaced displays do.

Progressive scan is still pretty new to the TV world, but it's been around for ages in the computer world, known as non-interlaced monitors!

The actual term "progressive scan" wasn't commonly used until DVD players and TVs with this technology surfaced a few years ago. Since then, it's pretty much replaced the term "non-interlaced", especially in the TV world.


THE MOVIE PC!
PIII 1.4 @ 1.66GHz, 158MHz bus, 512K L2 cache
2GB DDR-333
nvidia 7950GT AGP
X-Fi
1280x720 Optoma projector
JBL 5.1 amp/speakers
106 up-converted WMV-HD flicks


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Response Number 8
Name: Derek111
Date: December 20, 2007 at 22:46:49 Pacific
Subject: BluRay audio stuttering/popping
Reply: (edit)

Yes, I am using the Pentium M 2.25GHz, and it's a desktop.

My CPU never touches 100%. It's constantly at around 94%. Would that still cause the stuttering audio?


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Response Number 9
Name: Tubesandwires
Date: December 21, 2007 at 07:10:54 Pacific
Subject: BluRay audio stuttering/popping
Reply: (edit)

What I should have said in response 3 is progressive scanning is a recent term.
It may very well now refer to a non-interlaced display, but the word progressive isn't particularly well chosen - all TV and monitor displays are progressive, as in the lines are drawn from the top of the display downwards. Non-interlaced is a more accurate term.
The first time I noticed the term progressive scanning used was about 4 years ago in the description of features of a stand alone TV box that had a VGA output port that could be toggled pass through or TV output to a computer monitor.
Now you commonly see it in descriptions of features of some standalone DVD and CD players.


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