DVD Not Clear On Playback

[Jamon Camisso]

Glen Strom wrote:
> I replaced my old cd-rom and cdrw drives with dvd-rom and dvd-writer
> drives. The DVD seems to play fine -- no jerky motions or dropouts and
> the sound is fine -- until people start to move. Then I get a ghosting
> effect, not unlike a Star Trek kind of "phase shift". When the people
> stop moving, everything is clear again. 
> 
> The new drives are as follows:
> - LG Electronics Model GSA-H22N DVD-Writer
> id:   cdrom:0
> description:   IDE CD-ROM
> product:   HL-DT-STDVD-RAM -- LG Electronics GSA-H22N
> physical id:   0
> bus info:   ide at 1.0
> logical name:   /dev/hdc
> version:   1.01
> capabilities:   packet atapi cdrom removable nonmagnetic dma lba iordy
> configuration: mode  =  udma2
> 
> - Lite On DVD-ROM  Model SHD-16P1S
> id: cdrom:1
> description: DVD reader
> product:   LITE-ON DVD SHD-16P1S
> physical id: 1
> bus info: ide at 1.1
> logical name: /dev/hdd
> version:   GS07
> capabilities:   packet atapi cdrom removable nonmagnetic dma lba
> iordy audio dvd configuration:
> mode  =  udma2
> 
> 
> 
> My System Specs are as follows:
> - Dell Dimension 4100
> - Intel Pentium III (Coppermine), 930 MHz
> - L1 Cache 32-kb SRAM, L2 Cache 256 Kb
> - 512 Megs of memory
> - video card: ATI Rage 128 Pro with 16 MHz of memory
> 
> I only have the one DVD so I can't test out another one. I suspect my
> video card is the problem because it really is ancient. Does this sound
> like a video card problem or something else?

LCD screen with 16ms refresh time or greater? Sounds like ghosting to 
me. Most CRT monitors will ghost too.

> I have another minor problem with these drives. They play data CD's at
> a much higher speed than the old drives did, and the playback is very
> noisy. Is there a way to tell the drives to spin at a slower speed?

I think you can set drive speed with hdparm -E, not sure if that affects 
rotation speed though.

Jamon

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