Rare T2 Video single

On Jul 13, 9:16 am, scott <scott.fuch....RemoveThis@verizon.net> wrote:
> A long time ago in a galaxy far far away....
> I worked at Blockbuster for 2 years & have a rare Terminator 2
> Judgement day LD Teaser/Trailer. It is a VSD (Video single disc) the
> same size as a CD/DVD. Anyone interested? Or should I just list it on
> Ebay? It's old, produced in 1991, but only been played 2 or 3 times
> many years ago. Looking at the disc's surface, it looks very shiny &
> has no scratches or scuffs. That's not a guarantee it will play, but
> last time I played it, it was fine (12+ years ago). I no longer have a
> player to test it. I am in D/FW if anyone is local. I have a couple
> of pictures, but I don't see a way to attach them here.

I thought it'd play on any computer using VideoLAN's VLC player
but then I realized the video portion is LD's "analog" format with
varying length pits and lands and thus incompatible with a fully
digital system. It's *not* a VCD.

Two shots of my copy of the disc:

<http://thadlabs.com/LD_info/Covers/VSD-001/VSD-001_label.jpg>
<http://thadlabs.com/LD_info/Covers/VSD-001/VSD-001_insert.jpg>

BTW, it will NOT play in an HLD-X0 or HLD-X9 or similar players
with an LD-only sized central hole spindle.

On Jul 13, 2:09 pm, "t...@thadlabs.com" <t... RemoveThis @thadlabs.com> wrote:
> I thought it'd play on any computer using VideoLAN's VLC player
> but then I realized the video portion is LD's "analog" format with
> varying length pits and lands and thus incompatible with a fully
> digital system.  It's *not* a VCD.
>
> Two shots of my copy of the disc:
>
> <http://thadlabs.com/LD_info/Covers/VSD-001/VSD-001_label.jpg>
> <http://thadlabs.com/LD_info/Covers/VSD-001/VSD-001_insert.jpg>
>
> BTW, it will NOT play in an HLD-X0 or HLD-X9 or similar players
> with an LD-only sized central hole spindle.

For some time I have been trying to figure out a gimmick to read &
write VSDs (or CDVs) on a PC drive, but my impression is that it would
require hardware-level alterations. At very least it would be
necessary to circumvent the EFM process both ways. While EFM does
produce a pulse-width-modulated signal, the edge timing doesn't have
the necessary range of variation. Actually encoding the video & audio
into the bilevel PFM-PWM signal which is the output of the LD
production process would be a relatively simple matter mathematically,
but the output file would be very large, since (to vary the edge
timing sufficiently to get the LD signal-to-noise ratio) it seems the
time step would have to be in the range of 0.5 nanosecond.

I bought a couple of VSDs, one time, out of a box of compact discs. I
did this not only because I like the VSD concept, but because (to
anyone who didn't know the ins & outs of LD variants) it wasn't
completely obvious what they were. I didn't like to think of somone
buying one of these discs, then getting it home & discovering that the
only thing his equipment could detect was one CD-audio track
consisting of 4 seconds of total silence.

--publius--

On Jul 13, 2:07 pm, publius <cfcar... RemoveThis @gmail.com> wrote:
> On Jul 13, 11:16 am, scott <scott.fuch... RemoveThis @verizon.net> wrote:
>
> > A long time ago in a galaxy far far away....
> > I worked at Blockbuster for 2 years & have a rare Terminator 2
> > Judgement day LD Teaser/Trailer. It is a VSD (Video single disc) the
> > same size as a CD/DVD. Anyone interested? Or should I just list it on
> > Ebay? It's old, produced in 1991, but only been played 2 or 3 times
> > many years ago. Looking at the disc's surface, it looks very shiny &
> > has no scratches or scuffs. That's not a guarantee it will play, but
> > last time I played it, it was fine (12+ years ago). I no longer have a
> > player to test it. I am in D/FW if anyone is local.  I have a couple
> > of pictures, but I don't see a way to attach them here.
>
> As a matter of fact, I am in Fort Worth & I have a soft spot for
> VSDs.  I'd appreciate an email -- the gmail address used to post this
> is OK.
>
>   --publius--

If you want to pick it up, I am in Plano. Still need to talk price
though. Reply to my home email:
scott.fuchs59 RemoveThis @verizon.net

You would have to write a new driver for the CD drive that would know all
the correct rotational speeds and force it to spin when the normal sync data
is not there. The biggest challange would be to develop this drive that
would read the disc at the correct speed so you could even create the
correct EFM signal.

Would be much easier to modify a LD player to tap out the EFM or demodulted
signal and feed it to a video A/D.

Kurtis

"publius" <cfcarson.RemoveThis@gmail.com> wrote in message
news:1a398d6d-326f-4068-85fb-c8527a29eb70@l64g2000hse.googlegroups.com...
On Jul 13, 2:09 pm, "t...@thadlabs.com" <t....RemoveThis@thadlabs.com> wrote:
> I thought it'd play on any computer using VideoLAN's VLC player
> but then I realized the video portion is LD's "analog" format with
> varying length pits and lands and thus incompatible with a fully
> digital system. It's *not* a VCD.
>
> Two shots of my copy of the disc:
>
> <http://thadlabs.com/LD_info/Covers/VSD-001/VSD-001_label.jpg>
> <http://thadlabs.com/LD_info/Covers/VSD-001/VSD-001_insert.jpg>
>
> BTW, it will NOT play in an HLD-X0 or HLD-X9 or similar players
> with an LD-only sized central hole spindle.

For some time I have been trying to figure out a gimmick to read &
write VSDs (or CDVs) on a PC drive, but my impression is that it would
require hardware-level alterations. At very least it would be
necessary to circumvent the EFM process both ways. While EFM does
produce a pulse-width-modulated signal, the edge timing doesn't have
the necessary range of variation. Actually encoding the video & audio
into the bilevel PFM-PWM signal which is the output of the LD
production process would be a relatively simple matter mathematically,
but the output file would be very large, since (to vary the edge
timing sufficiently to get the LD signal-to-noise ratio) it seems the
time step would have to be in the range of 0.5 nanosecond.

I bought a couple of VSDs, one time, out of a box of compact discs. I
did this not only because I like the VSD concept, but because (to
anyone who didn't know the ins & outs of LD variants) it wasn't
completely obvious what they were. I didn't like to think of somone
buying one of these discs, then getting it home & discovering that the
only thing his equipment could detect was one CD-audio track
consisting of 4 seconds of total silence.

--publius--

On Sun, 13 Jul 2008 12:45:59 -0700 (PDT), publius <cfcarson RemoveThis @gmail.com>
wrote:

>For some time I have been trying to figure out a gimmick to read &
>write VSDs (or CDVs) on a PC drive, but my impression is that it would
>require hardware-level alterations. At very least it would be
>necessary to circumvent the EFM process both ways. While EFM does
>produce a pulse-width-modulated signal, the edge timing doesn't have
>the necessary range of variation. Actually encoding the video & audio
>into the bilevel PFM-PWM signal which is the output of the LD
>production process would be a relatively simple matter mathematically,
>but the output file would be very large, since (to vary the edge
>timing sufficiently to get the LD signal-to-noise ratio) it seems the
>time step would have to be in the range of 0.5 nanosecond.


At one point a number of years ago someone claimed to have been able
to successfully duplicate a CDV to a CD-R using a particular
combination of available (and unmodified) hardware and software. The
trick was said to have been to both read and write totally in raw
mode, as to copy the pit-land structure. At the time I had a similar
setup (an old Yamaha 4x unit with one of the Goldenhawk tools) but was
never successful beyond the CDA tracks. I suspect there's possibly
also something different about the TOC structure that CD readers can't
parse, and thus won't scan beyond those CDA sectors.
Realistically I wonder if those old writers even had the necessary
frequency at the laser head to re-create the FM carrier... tho perhaps
modern ones might. No doubt a significant firmware mod would be
required, maybe locking the spindle at 1x while the laser operation is
at higher speed to replicate the proper LD pit/land edges... but I'm
thinking rapidly out of my depth here.

(I don't now recall the physical CDV spec... was the LD section of a
different track pitch? i.e. that which was standard for LD vs the
larger CD spec?)

-KD

--
To reply via email: this ID @<a well known service related to oogling>.com

On Jul 18, 1:00 pm, Cyclograph <cyclogr....RemoveThis@mail.g> wrote:
> [...]
> (I don't now recall the physical CDV spec... was the LD section of a
> different track pitch? i.e. that which was standard for LD vs the
> larger CD spec?)

I don't have the data or specs either, but it would seem the LD
section would have to have, by definition, the same characteristics
as a "normal" LD (either 8" or 12").

I can play the T2 demo CDV on my CLD-99, CLD-D704 and
CLD-980 players; it won't fit in my HLD-X9 players due to the
spindle hole size.