> Looking for VCD specs, schematics, etc.... How does VCD work and how might
> you build hardware to support it?
>
> Thanks!
>
>
>
>
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> 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                      spamBeGoneatrusspamBeGoneatrustrivalie.org
>   >>  Atrus Trivalie Productions      http://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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>>>    >>  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 (http://www.enreach.com)
>>>    >>  Regards,
>>>    >>  Peter Tiang

> >>>    >>  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 (http://www.enreach.com)
> >>>    >>  Regards,
> >>>    >>  Peter Tiang

> So when someone downloads a VCD off the net how is a disk made?
> R.
>
> >>>    >>  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 (http://www.enreach.com)
> >>>    >>  Regards,
> >>>    >>  Peter Tiang