Breaking News

SAMA introduces L70 AIO Liquid Cooler Crucial Unleashes Its Most Powerful Gaming Memory Yet: DDR5 Pro OC 6400 CL32 RICOH announces GR IV Monochrome and GR IV HDF High-end Compact Digital Cameras CORSAIR Launches the Revolutionary AIR 5400 Triple-Chamber Mid Tower to Redefine Performance ASUS TUF Gaming Unveils Call of Duty Black Ops 7 Edition AMD Radeon RX 9070 XT

logo

  • Share Us
    • Facebook
    • Twitter
  • Home
  • Home
  • News
  • Reviews
  • Essays
  • Forum
  • Legacy
  • About
    • Submit News

    • Contact Us
    • Privacy

    • Promotion
    • Advertise

    • RSS Feed
    • Site Map

Search form

VideoCD Format

Feb 19,2002 0

11. Structure of VCD

 

Review Pages

1. Formats
2. Quality
3. Software
4. Making a VCD
5. ASF to VCD
6. DVD to VCD
7. Extended VCD (XVCD)
8. Rip & Duplicate VCD's
9. FAQ
10. Techical Specification: Tracks on VCD
11. Structure of VCD
12. VideoCD Encoding

 

Techical Specification: Structure of VCD - Page 11

Source ( VideoPack 4 Manual)

The logical structure of the Video CD is destined to allow access by track playing mechanisms of low-priced consumer players, by computer systems and CD-i players too. The first track on the disc is the Video CD Data track. File structure conforms to ISO 9660 allowing access for computer-based platforms. To support access to information of this data track by simple consumer players too, information areas for track playing mechanisms have to be at a fixed absolute location on the CD. The track starts with a two second pregap and 16 empty sectors at time code position 00:02:16 (MM:SS:FF).

At this point the PVD (Primary Volume Descriptor) begins that contains basic information about the disc such as the address of the root directory, the path table and the CD-i directory (the path table is an index to the file structure containing the addresses of the subdirectories. The purpose is to improve the performance of file access). At a fixed time code address optionally a Karaoke Basic Information Area (00:03:00)is positioned followed by the Video CD Information Area (00:04:00). The Karaoke Basic Information Area is used to store fonts, texts and access information for Karaoke CDs only.

The Video CD Information Area contains the mandatory files 'INFO.VCD' and 'ENTRIES.VCD'. INFO.VCD gives general information about the system, for example to what specification version the disc conforms, what picture size - PAL (352x288) and NTSC (352x240) - is used, if there is a special file for Karaoke, if there is special area, called Segment Play item Area (see below) on the disc, etc. ENTRIES. VCD contains a list of starting positions in the MPEG-Audio-Video tracks. On one disc there can be up to 500 entry points of addresses allowing direct access to parts of video sequences.

This area may optionally contain two more files called 'LOT.VCD' and 'PSD.VCD'; PSD stands for 'Play Sequence Descriptor', LOT for 'List ID Offset Table'. Both files contain control elements for preprogrammed interactive applications. These basic elements are a play list and a selection list, one giving a list of sequences or parts of sequences that have to be interpreted, the other describing the links and the ways to access audio or video sequences and still pictures.

The information of these files is interpreted by consumer players, the appropriate files for CD-i and computer platform contain extended selection lists. These files are called PSD_X.VCD and LOT_X.VCD. There have to be more information for these platforms to support direct access with a pointing device via buttons and highlighted areas. These files are in a folder named EXT. Additional information for the CD-i player is stored in a folder named CDI.

A folder named MPEGAV contains files with the MPEG-Audio-Video tracks. If there are any Red-Book-Tracks on the discs there has to be a folder named CDDA containing the audio files. Following Video CD specification version 2.0 not only MPEG-tracks may contain MPEG video and audio, the standard allows to store additional video, audio and still videos in a special segment of the Video CD data track (track #1).

This area is called Segment Play item Area, because the Pplay items are stored in fixed segments, accessible for players with track playing mechanisms. The length of each segment measures 150 sectors. A maximum of 1980 segments is allowed on one CD, each segment has a number starting with 1. If there is such an area on the disc there has to be an folder called SEGMENT with the files of the Segment Play items.

The file system on a Video CD 2.0 conforms to ISO 9660 standard. ISO 9660 standard specifies an hierarchical file system similar to the file system of DOS. The standard has 3 interchange levels, but in general when talking about ISO-9960 discs interchange level 1 is focused. This means that not more than 8 directory levels are allowed for depth, and only capital letters 'A' to 'Z', numerical '0' to '9' and the underscore character '_' its allowed to name files and directories.

Files names consist of at least 1 up to 8 characters and an optional extension of up 3 characters added behind a dot '.'. Directory names cannot have an extension. ISO 9660 Interchange level 2 and level 3 are allowing more freedom in naming files, but level 1 is an industrial standard supported by software drivers and many computer systems. This standard stands for interchangeability between different platforms. Non-ISO disc conform to proprietary standards of operating systems, for example Apples Hierarchical File System (HFS).

 

Review Pages

1. Formats
2. Quality
3. Software
4. Making a VCD
5. ASF to VCD
6. DVD to VCD
7. Extended VCD (XVCD)
8. Rip & Duplicate VCD's
9. FAQ
10. Techical Specification: Tracks on VCD
11. Structure of VCD
12. VideoCD Encoding

 

Pages

  • « first
  • ‹ previous
  • …
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • next ›
  • last »

Tags:
Previous Post
32x CD-RW Roundup Vol3
Next Post
Roxio Ez CD Creator 5.0 CD-R Software

Related Posts

Latest Reviews

be quiet! Light Base 500 LX
Cooling Systems

be quiet! Light Base 500 LX

be quiet! Pure Loop 3 280mm
Cooling Systems

be quiet! Pure Loop 3 280mm

Dragon Touch Digital Calendar
Consumer Electronics

Dragon Touch Digital Calendar

Soft2bet and the unseen hardware that makes instant play possible
Enterprise & IT

Soft2bet and the unseen hardware that makes instant play possible

Noctua NF-A12x25 G2 fans
Cooling Systems

Noctua NF-A12x25 G2 fans

Popular News

COLORFUL Introduces CVN B850I GAMING FROZEN Motherboard

COLORFUL Introduces CVN B850I GAMING FROZEN Motherboard

COLORFUL Presents CVN X870 ARK FROZEN Motherboard for AMD Ryzen 9000 CPUs

COLORFUL Presents CVN X870 ARK FROZEN Motherboard for AMD Ryzen 9000 CPUs

COLORFUL Presents the B860 Series Motherboards

COLORFUL Presents the B860 Series Motherboards

Intel-AMD new motherboards announced

Intel-AMD new motherboards announced

TEAMGROUP Launches EXPERT P34F Find My External SSD

TEAMGROUP Launches EXPERT P34F Find My External SSD

ASRock AM5 Motherboards Now Fully Support AMD Ryzen 9 9950X3D & 9900X3D Processors

ASRock AM5 Motherboards Now Fully Support AMD Ryzen 9 9950X3D & 9900X3D Processors

Samsung announces Galaxy Tab S11 and Galaxy S25 FE series

Samsung announces Galaxy Tab S11 and Galaxy S25 FE series

Viltrox Showcases Upcoming Lens Lineup and New TTL Flash at IBC 2025

Viltrox Showcases Upcoming Lens Lineup and New TTL Flash at IBC 2025

Main menu

  • Home
  • News
  • Reviews
  • Essays
  • Forum
  • Legacy
  • About
    • Submit News

    • Contact Us
    • Privacy

    • Promotion
    • Advertise

    • RSS Feed
    • Site Map
  • About
  • Privacy
  • Contact Us
  • Promotional Opportunities @ CdrInfo.com
  • Advertise on out site
  • Submit your News to our site
  • RSS Feed