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'[EE]: VCD hardware, software?'
2001\02\10@105018 by Richard Sloan

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Looking for VCD specs, schematics, etc.... How does VCD work and how might you build hardware to support it?

Thanks!

   
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2001\02\10@130720 by Yann Ramin

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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:
{Quote hidden}

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2001\02\10@142706 by Richard Sloan

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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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 >>  --

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 >>  Yann Ramin                      atrusspamspam_OUTatrustrivalie.org
 >>  Atrus Trivalie Productions      http://www.redshift.com/~yramin
 >>  AIM                             oddatrus
 >>  Marina, CA                      http://profiles.yahoo.com/theatrus

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 >>  When smashing monuments, save the pedstals -- they always come in handy.
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2001\02\10@145402 by Yann Ramin

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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:
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2001\02\10@150650 by Randy Glenn

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I've seen a couple VCDs (at least, I was told they were VCDs), and
Windows recognized them as ISO9660.

The MPEG data decoding would be "fun", but once you had an MPEG data
decoder, you've suddenly got an MP3 player, too ;)

Whatever you find out about MPEG data decoders, please post!

- -Randy Glenn

This coming from the guy with a system tray 7 icons wide... by 2
tall...
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- {Original Message removed}

2001\02\11@031449 by Peter Tiang

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Hi Richard,

   The VideoCD specification ver 2.0 is available
   under "White Book" spec from Philips. AudioCD
   spec is called the "Red Book".
   You have to pay for it, of course. Point your
   browser to http://www.licensing.philips.com

   VCD hardware (full-size player) is widely
   available in the Far East for less than US$50.
   Most of these VCD players also supports MP3 disc
   playback. These MP3 disc are just normal ISO9660
   disc with MP3 files (~300 files/songs per disc).
   So I would'nt advise building your own player.

   Most uses MPEG1 decoders from C-Cube (http://www.c-cube.com)
   or ESS Technology (http://www.esstech.com).

Regards,
Peter Tiang

{Original Message removed}

2001\02\11@031856 by Peter Tiang

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VideoCD is ISO9660 compatible.
The MPEG1 file appears as .DAT files on a PC.

Beside that, VideoCD also carries a Table-of-Content
(TOC) which contains track information. This is so
that it is compatible with Audio CD loaders besides
CD-ROM.

Regards,
Peter Tiang

{Original Message removed}

2001\02\11@033553 by Peter Tiang

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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

{Original Message removed}

2001\02\12@100842 by Richard Sloan

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So when someone downloads a VCD off the net how is a disk made?
R.

{Quote hidden}

>>>    >>  {Original Message removed}

2001\02\12@153325 by Herbert Graf

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> So when someone downloads a VCD off the net how is a disk made?
> R.

    You use a program that burns Whitebook format CDs, NERO I believe is
one of them. However the MPG you use for this has to be rather perfect and
the right type. An MPEG encoded at 25fps will not work in north american VCD
players. TTYL

{Quote hidden}

> >>>    >>  {Original Message removed}

2001\02\15@215826 by Peter Tiang

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Hi Richard,

   Sorry for the late reply as I was out of town.

   What format is the downloaded VCD files ?

   For VCD authoring, as recommended in my last email...

   I-Author for VCD by EnReach (http://www.enreach.com)
   will arrange your MPEG files into proper
   White Book format. The resultant file is in
   .CIF format which is the CD image that can
   be processed by Adaptec CD Creator.

   The input MPEG file might need to be in
   specific format though, such as the right
   resolution, bitrate, etc.

   If you just intend to playback these MPEG
   files on a PC, you don't have to burn them
   into VCD format. Save burn onto CD-Rs like
   normal files.

Regards,
Peter Tiang

{Quote hidden}

> >>>    >>  {Original Message removed}

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