Cable TV decoding Software on PC!
Dennis Hau
me if you know it is? Or at least give me some tips on how/where I can
get it? I appreciated it!!!
For those who sent me the information..I'll send then real nice jpg pict
for compensation!! Thanks so much in advance!
PS: PLEASE SEND TO 'dha...@yahoo.com'
Regards,
Gary Tait
schemes, but due to the way the hardware works, suppressed sync software
is an impossibility.
--
Gary Tait,VE3VBF Homepage: http://www.primeline.net/~tait
*** Do not Email back me newsgroup responses, just post them. ****
Email sent, if replied, will be replied with the provided address,
as is, if it comes back undeilvered,it will be deleted.
scobie
Dennis Hau <dh...@asiaonline.net> wrote in message
news:37B6CE8E...@asiaonline.net...
Tod Brown
wrote:
Could you explain in more detail why this is not possible, (software
descrambler) with a PC tv tuner?
Thanks.
>What sort of scrambling is used? Software exists for PAL Line shuffling
>schemes, but due to the way the hardware works, suppressed sync software
>is an impossibility.
>
>Dennis Hau wrote:
>>
>> Does anyonce have the TV descrambler Software? Can you please send it to
>> me if you know it is? Or at least give me some tips on how/where I can
>> get it? I appreciated it!!!
>> For those who sent me the information..I'll send then real nice jpg pict
>> for compensation!! Thanks so much in advance!
>> PS: PLEASE SEND TO 'dha...@yahoo.com'
>>
>> Regards,
>
Steve
You will see where this question has been asked 1000s of times and it
has been explained 1000s of time..
Gary Tait
but a frame grabber, which works like a TV set, but
instead of writing to a phosphor on a CRT,it
writes to a memeory chip, which the computer
reads and processes. Since, like a TV, a frame
grabber requires a sync signal to operate,
suppressed sync video wil destroy the picture as it does on a TV.
Tod Brown wrote:
>
> On Sun, 15 Aug 1999 12:05:16 -0400, Gary Tait <ta...@primeline.net>
> wrote:
>
> Could you explain in more detail why this is not possible, (software
> descrambler) with a PC tv tuner?
>
> Thanks.
>
> >What sort of scrambling is used? Software exists for PAL Line shuffling
> >schemes, but due to the way the hardware works, suppressed sync software
> >is an impossibility.
> >
> >Dennis Hau wrote:
> >>
> >> Does anyonce have the TV descrambler Software? Can you please send it to
> >> me if you know it is? Or at least give me some tips on how/where I can
> >> get it? I appreciated it!!!
> >> For those who sent me the information..I'll send then real nice jpg pict
> >> for compensation!! Thanks so much in advance!
> >> PS: PLEASE SEND TO 'dha...@yahoo.com'
> >>
> >> Regards,
> >
> >--
> >Gary Tait,VE3VBF Homepage: http://www.primeline.net/~tait
> >*** Do not Email back me newsgroup responses, just post them. ****
> >Email sent, if replied, will be replied with the provided address,
> >as is, if it comes back undeilvered,it will be deleted.
--
Gary Tait,VE3VBF Homepage: http://www.primeline.net/~tait ICQ 43425545
Benchtech
<steve.gl...@worldnet.att.net> wrote:
> go to http://www.deja.com and on the power search type in PC TV card.
> You will see where this question has been asked 1000s of times and it
> has been explained 1000s of time..
>
Steve, could you post the message you have that was written by Mike G. It
has been a while since it has been posted and it might explain alot of
things for everyone asking why it can't be done. Thanks
> Tod Brown wrote:
> >
> > On Sun, 15 Aug 1999 12:05:16 -0400, Gary Tait <ta...@primeline.net>
> > wrote:
> >
> > Could you explain in more detail why this is not possible, (software
> > descrambler) with a PC tv tuner?
> >
> > Thanks.
> >
stuff snipped
Steve
Xmas comming we will be getting a lot more..
Steve
This will now be posted every time someone asks that famous question..
John Roberts said to Mike G: Can you digitize the video with these
cards? Of course you can! Therefore, you can descramble it.
Mikes Reply: Don't know what you're talking about, but I'm referring
to
the most common scrambling technique of hiding/supressing/altering the
horiz sync pulse. Now, think for a moment about WHAT you would be
digitizing if you tuned into one of those types of signals. Ever see
the smeared picture on a TV set tuned to a scrambled picture?
That's what each digitized frame would look like. The frame buffer
would be filled with scan lines that did not start and stop at the right
spots
because the ANALOG signal that controls WHEN this happens did not get
the properly timed sync pulse from the video. (It's missing, remember?)
It will finally trigger on a black peak in the frame, but about 8-10uS
of video data (or about 20% of that line) will have passed while it
incorrectly performs a retrace in the middle of the video stream. Even
if you COULD restore a picture by analyzing the frame buffer and
re-aligning each scan line so that it starts and stops at the right
time,
you have 2 major problems. First, (which was exactly my point in my
last post) there is no PC that is going to be able to digitally analyze
and correct over 15K lines each second without some key external
hardware added on. Second, you STILL will have big holes in the video
when the video stream was broken in the wrong places while filling the
frame buffer. You're only hope would be to digitize the RAW video stream
BEFORE it reaches the frame buffer and analyze it on the fly to
determine where each line is supposed to start and stop. But now you
are talking about something that NO TV tuning PC card is set up to do.
They don't HAVE to. They do it the easiest way possible, because they
assume the video HAS valid sync pulse information they can use. Besides,
this does not satisfy Steph's original post of: "Is there a software to
decode cable channels on a tvcard to see tv on the computer ???"
>Now, can the boards digitize at 30 fps and can your cpu display the >"descrambled" processed data that fast. Probably not.This makes no >sense. They pull data out of the frame buffer and plop it on a window
>on the screen right now at 30 FPS with no problems.
It's NOT the display part that's impossible, its the PRESSING /
DESCRAMBLING part.
Steve
time someone asks that famous question..
John Roberts said to Mike G: Can you digitize the video with these
cards? Of course you can! Therefore, you can descramble it.
Mikes Reply: Don't know what you're talking about, but I'm referringto
the most common scrambling technique of hiding/supressing/altering the
horiz sync pulse. Now, think for a moment about WHAT you would be
digitizing if you tuned into one of those types of signals. Ever see
the smeared picture on a TV set tuned to a scrambled picture? That's
what each digitized frame would look like. The frame bufferwould be
filled with scan lines that did not start and stop at the rightspots
because the ANALOG signal that controls WHEN this happens did not get
the properly timed sync pulse from the video. (It's missing, remember?)
It will finally trigger on a black peak in the frame, but about 8-10uS
of video data (or about 20% of that line) will have passed while
itincorrectly performs a retrace in the middle of the video stream. Even
if you COULD restore a picture by analyzing the frame buffer and
re-aligning each scan line so that it starts and stops at the righttime,
you have 2 major problems. First, (which was exactly my point in my
last post) there is no PC that is going to be able to digitally analyze
and correct over 15K lines each second without some key external
hardware added on. Second, you STILL will have big holes in the video
when the video stream was broken in the wrong places while filling the
frame buffer. You're only hope would be to digitize the RAW video stream
BEFORE it reaches the frame buffer and analyze it on the fly todetermine
where each line is supposed to start and stop. But now you are talking
about something that NO TV tuning PC card is set up to do. They don't
HAVE to. They do it the easiest way possible, because they assume the
video HAS valid sync pulse information they can use. Besides,this does
not satisfy Steph's original post of: "Is there a software todecode
cable channels on a tvcard to see tv on the computer
???"
>Now, can the boards digitize at 30 fps and can your cpu display the >"descrambled" processed data that fast. Probably not.This makes no
>sense. They pull data out of the frame buffer and plop it on a window
>on the screen right now at 30 FPS with no problems.
It's NOT the display part that's impossible, its the PRESSING
/DESCRAMBLING part.
*************************************************************************
Someone please save this and repost it every time someone asks this
question.
Excellent analysis of the situation,
Thanks again Mike G!
Sky Walker
=>The chip on the video card is not a simple D/A convertor,
=>but a frame grabber, which works like a TV set, but
=>instead of writing to a phosphor on a CRT,it
=>writes to a memeory chip, which the computer
=>reads and processes. Since, like a TV, a frame
=>grabber requires a sync signal to operate,
=>suppressed sync video wil destroy the picture as it does on a TV.
It can be done, but there is no profit to write such a program. So there isn't
any programs to do this.
Remember, the video chip hardware and software is already does some "guessing"
to decode scrambled channels, otherwise you won't be able to see anything on
the scrambled channels.
---------------------------quote from my last posting-------------------------
After briefly reading some documents mentioned below I have some idea for
'Sync Suppressing' decoding for PC TV Tuner card based on BT878/879 and ATI TV
Cards.
"Bt81x/Bt82x/Bt848 Sync Locking in source Multiplexed Applications"
"Bt878/879 Single-Chip Video and Broadcast Audio"
"ATI Multimedia Channel (AMC) Application Programming Interface"
1. Super Low level programing(work on all BT chip cards including ATI)
a. scan all channels for the channel contain 'sync unsuppressed signal'
b. record the 'sync unsuppressed signal' sequence
c. set video chip register to use 'user provided sync'
d. provide your own sync
e. you get the channel
2. High level programming using ATI SDK
a. sample everything
b. adjust timing and cycle manually and gradually
It is easy to tune in "fix sync" single.
For "variable sync" single, will be tougher to decode.
Explanation;
The purpose of "Sync Locking" or "Sync Suppressing" is to mess up the timing
for the video decoder chip to sample correct data.
The first solution is trying to provide a correct 'timing' to sample correct
data.
The second solution is to sample everything and then adjust the timing
manually.
---------------------------quote from my last posting-------------------------
--
E-Mail: SkyWalker1689 at Hotmail period Company
800-404-3733 get your phone number(use it on your own risk)
David E Glass
<steve.gl...@worldnet.att.net> wrote:
>Wrong, it can't be done with a pc tv card!
But why not? It can be done with Sky TV through a satellite dish, so
hy not cable? I am very new to cable so I know very little about how
the whole system works.
Dave
--
David E Glass, ICQ# 3263311
Save the whales, collect the whole set.
Steve
David E Glass wrote:
>
> On Thu, 21 Oct 1999 20:06:09 GMT, Steve
> <steve.gl...@worldnet.att.net> wrote:
>
> >Wrong, it can't be done with a pc tv card!
>