Hi Yann,

    VCD is ISO9660 compatible. It does not appear as
    "raw" audio tracks, but actually appears as files
    on a PC.

    VCD sector is Mode 2 Form 2 which carries EDC
    (Error Detection coding), which is at least better
    than the Mode 1 "raw" Audio CD. The EDC serves
    the purpose to inform the MPEG1 decoder to drop
    the particular frame from that sector. We are
    talking 30 fps (PAL) here, so a dropped frame
    or two does not have much impact.

    Data disc (or CD-ROM XA to be precise) sectors
    are Mode 2 Form 1 which also carries ECC (Error
    Correction Coding) which gives the reliability
    that is required of a data disc.

    Just a reminder though, just copying the MPEG1
    files onto a CD-R does not a VCD make. You'll
    need proper authoring tools to do that.
    I recommend EnReach I-Author (www.enreach.com)

Regards,
Peter Tiang

----- Original Message -----
From: "Yann Ramin" <atrus@ATRUSTRIVALIE.EU.ORG>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, February 11, 2001 3:52 AM
Subject: Re: [EE]: VCD hardware, software?


> I do not believe so, no. What it appears to be is a series of "raw" (aka
> audio) tracks, but instead of 16bit little-endian audio, it is a mpeg1
stream
> (unreliable data on that one).  Specs on this are really hard to find. My
> suggestion is to find a VCD and use your computer to examine it.
>
> Yann
>
> On Saturday 10 February 2001 11:23 am, you (Richard Sloan) might have
said:
> > So the disk is not ISO9660?
> >
> > Would be nice to find spec somewhere.
> >
> > R.
> >
> >   >>  VCD is the same as CD-ROM in large sense; the tracks are a little
> >   >>   different,
> >   >>  but the data method is the same.. The video stream is simply an
> >   >> MPEG-1 video,
> >   >>  which can take some CPU muscle to decode.
> >   >>
> >   >>  Yann
> >   >>
> >   >>  On Saturday 10 February 2001 07:48 am, Richard Sloan wrote:
> >   >>  > Looking for VCD specs, schematics, etc.... How does VCD work and
> >   >>  > how
> >   >>
> >   >>   might
> >   >>
> >   >>  > you build hardware to support it?
> >   >>  >
> >   >>  > Thanks!
> >   >>  >
> >   >>  >
> >   >>  >
> >   >>  >
> >   >>  > --
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> >
 >>  --------------------------------------------------------------------
> >   >>  Yann Ramin                      atrus@atrustrivalie.org
> >   >>  Atrus Trivalie Productions      www.redshift.com/~yramin
> >   >>  AIM                             oddatrus
> >   >>  Marina, CA                      http://profiles.yahoo.com/theatrus
> >   >>
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> >   >>  SNTS Developer                  KLevel Developer
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> >   >>
> >   >>  When smashing monuments, save the pedstals -- they always come in
> >   >> handy. -- Stanislaw J. Lem, "Unkempt Thoughts"
> >   >>
> >   >>  "Outlook not so good." That magic 8-ball knows everything! I'll
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> --------------------------------------------------------------------
> Yann Ramin                      atrus@atrustrivalie.org
> Atrus Trivalie Productions      www.redshift.com/~yramin
> AIM                             oddatrus
> Marina, CA                      http://profiles.yahoo.com/theatrus
>
> IRM Developer                   Network Toaster Developer
> SNTS Developer                  KLevel Developer
> Electronics Hobbyist            person who loves toys
>
> When smashing monuments, save the pedstals -- they always come in handy.
>                 -- Stanislaw J. Lem, "Unkempt Thoughts"
>
> "Outlook not so good." That magic 8-ball knows everything! I'll
> ask about Exchange Server next
> --------------------------------------------------------------------
>
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> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
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