Basically LZ coding but for video.. re-using previously seen data


On Saturday, May 24, 2008 at 10:54:29 AM UTC+10, Sportman wrote:

On May 23, 4:36 pm, Jim Leonard <MobyGa...@gmail.com> wrote:

This makes no sense whatsoever, especially the last sentence.  It describes a video compression as understood by a child ("only update changed pixels") which is the tip of the proverbial iceberg in any
video compression system.

If you take a 90 minutes raw DVD video 720×576 pixel at 25 fps and
convert every pixel to a value corresponding with the pixel
information then you can create for every of the 414,720 pixel
positions a streams with each 135,000 values. If a pixel value can be
0-1023 then there are 10 bits needed for a value so 168,750 bytes for
every stream so total round 70GB. If you can lossless compress every
stream 20 times then there is 3,5GB left. So it looks like an
impossible task to bring this down to 1KB.

But Jan Sloot did it, in worste case he used 2KB + 4MB + 4MB + 128KB =
8,13MB if he used all internal and external memory of his first
patented device to store and playback one DVD.

The 2KB temp memory he used to store a line of pixel values from a RGB
video signal and the 4MB temp memory he used to store 625 lines what's
one frame. This frame is stored in the other 4MB memory. Then he fill
again the 2KB temp memory with a line and again the 4MB temp memory
with 625 lines. Every time a line is equal as an early done line he
store not the line but a reference code of the line done before and he
do the same with a frame; every time a frame is equal as an early done
frame he do not store the frame but a reference code of the frame done before. This comparing and assigning is done by the two CPU's one for
the line and one for the frame. So far I can follow it, by this way
all line and frame values are 100% unique.
Then he store this seconde frame also in the 4MB memory where he
already stored the first frame and he do that also for all the other
frames and when all frames are done the information in this 4MB memory
is stored in the external 128KB chipcard as last action. The playback
is the same but then in reverse.

If a line fit in 2KB then 625 lines=1 frame fit in 1250KB. Because
more then 3 frames do not fit in 4MB how he stored hundred thousand
frames in one 4MB memory? He leave us with a mystery.

He describe one other thing what he explain with a little example:

If we minimize a line to 16 pixels = 16 values between 0-1000 then we
can get for example:

200 500 100 400
090 750 640 360
190 360 870 100
850 030 390 920

If the next 16 pixels are:

220 520 120 420
110 770 660 380
210 380 890 120
870 050 410 940

Then he do not store this sequence but store the reference number of
the first one +20 this can also minus - or qual =
Probably he do this for full lines and frames (625 lines) to store
less because so he get more matches with early done lines and frames.

I think it's clear that Sloot was just another huckster.  The
different between him and Adam was that he was a tiny bit more clever
to build a "prototype" piece of hardware to distract people from the
fact that he was simply playing movies from another location.

It's impossible he played movies from other locations. First a metal
box act as a cage of faraday so you need an antenna what nobody saw
and some demonstations where done in gates villas with big gardens
with some distance between the road and house. Second his device was demonstrated (at locations he didn't know) and opened (without his permission) in the US without him. Third you need 16 TV tuners to
playback 16 movies at the same time, that's a lot of space and
bandwidth to send that from remote. Fourth he could jump to any point
in the movie instucted by the skeptic watchers. Fifth he demonstraded
live recording from a video camera of DVD/video or TV source and
playback for the chipcard. Six he took out the chipcard the movie
stopped and putting in an other showed an other movie. Seven also
after his dead the playback device was still playing videos from
chipcards. They say that the problem was that you could not create
chipcards, he hided that source code on a floppy. Jan Sloot said the
source code and description was laying in a safe, after his dead they
found a safe key but they never found the safe matching this key.

A big indicator of snake oil is whether or not there are video records
of these demonstrations.  In all cases, there are none.

There is at least one video made by a company where Adam Clark
demonstrated his technology, I have verified this fact. If there was a
camera for recording by some demonstration of Jan Sloot I assume that
that camera is also used for recording a demonstation. None of this
tapes is public available.

--- SoupGate-Win32 v1.05
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