Re: Currently-Available Highest-Quality Linear PCM Video?


"Radium" <glucegen1@xxxxxxxxxx> wrote in message
news:1161280758.174444.71260@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Why isn't linear-PCM used in video?

Why do you think it should be?

The same reason audio CDs used linear-PCM video instead of compressed
MP3s. MP3 and other compressed formats are inferior in quality to the
uncompressed linear-PCM.

Why linear PCM specifically, though? Why not any of
the other uncompressed digital formats? Do you know
why linear PCM is used when it IS used?

What storage capacity would be required to store one
hour of uncompressed 1920 x 1080 video at 24 bits per
pixels and using a 60 Hz progressive-scan format? What
bandwidth would be required to broadcast such a signal
(or carry it over a cable system), and using what modulation
method?

It wouldn't have those nasty "jaggies" associated with VC-1 or other
compressed video

What costs (either in actual $ costs or performance) would using
linear PCM require?

I agree, linear-PCM video would be more expensive but it wouldn't have
those annoying artifacts that occur in compressed video formats.

I didn't exactly ask whether or not it would be more expensive
- I was asking you to specifically identify, and hopefully
quantify, the added expense. Can you do that?

The lasers required would have to be of shorter wavelength than those
used in the writing and reading of conventional DVDs. The wavelength
should be 400 nm since thats the "sweet spot" between the advantages of
short wavelengths [i.e. less physical space on disc required] and the
hazards of ionizing UV radiation. 400 nm is around the shortest
wavelength of non-ionizing UV light.

In addition, the disc would have to be somewhat bigger -- around the
size of 33-speed phonos -- to accomodate the large data size required
for linear-PCM video.

How did you arrive at that size? What would the storage
capacity of such a system be for any of the standard television
formats?

Are you sure that isn't that the bit-rate? There is a world of
difference between bit-rate and sample-rate.

How many bits do you think are contained within each
"pixel"? What do you think the word "pixel" means, and
how is it distinguished from "sample" in the context of
digital imaging?

A "pixel" is *definitely* digital. A "sample" can be analog or digital.

Again, you didn't answer the question, and no, a "pixel" is not
"definitely digital." "Pixel" is derived from "picture element" -
in other words, a *sample* of an image. In imaging (and esp.
in video systems) "pixel" and "sample" (at least when used in the
context of the image data rather than the display device) are
precisely identical. Even then, your answer ("a 'pixel' is definitely
digital") has nothing to do with the question "how many bits do
you think are contained within each pixel?". In fact, since you seem
(based on your answer) to be hung up on the idea that "pixels"
ARE "digital," it makes that question all the more relevant.
Please answer it, and then you will have cleared up your confusion
regarding "bit rate" and "pixel rate."

If you divide 1,411,200 by 44,100, what number do you
get?

32

What is the significance of this number?

The bit-rate divided by the sample-rate. What else?

Which means what? Do you think this might have something
to do with the number of bits in each sample? Do you now
see how that relates to your confusion regarding pixel rate
and bit rate?


Why are you so hung up on "linear PCM"
as opposed to any of several hundred (at least) other possible
encoding schemes?

Because -- as I said before -- I don't like the annoying artifacts that
occur in compressed video formats. Those nasty pixelations associated
with VC-1 -- and other compressed -- video just make me gag.

And yet you seem to believe that "linear PCM" is the only
possible format which would not exhibit those artifacts, without
expressing the slightest hint that you understand why this should
be so (were it true in the first place, which it isn't). Once again,
you have latched onto a buzzword or phrase without the slightest
understanding of what it actually implies. Do you enjoy looking
this foolish?

The *real* WMV should have the sampling rates and progressive
resolution [pixel X pixel] of the best quality video signal currently
existing. In addition, the WMV's sample rates and pixelXpixel format
should be exactly the same as the linear-PCM signal it was prior to
compression. As for the color-depth [in "bit-resolution"], decrease it
all you want and I still won't mind.

Really? What do you think "color depth" or "bit resolution"
equates to in terms of the image quality? What will a reduction
in this parameter change in the image?

Bob M.


.

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