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I |
| I Frame |
Image frame. A video frame encoded as a single image; other frames can be derived from this frame, such as B Frames and P Frames. See B Frame, P Frame. |
| i.Link |
Sony’s term for Firewire. |
| ID |
Identification Data. On discs, it is a 32-bit field that identifies sector numbers. |
| ID3 |
A tag stored in an MP3 file that contains information about the file, such as artist, title, song name or track duration. |
| IDE |
See ATA. |
| iDVD |
DVD authoring software for the Mac. |
| IEC |
ID Error Correction. Extra bytes added to sector headers which help correct disc errors. |
| IEEE1394 |
Firewire. |
| IMG |
(File extension: .img) A file used to make a sector-by-sector copy of a disk. |
| Indexes |
Additional starting points inserted into a CD audio track. |
| Interactive Games |
Brief games included on some DVDs, revolving around the feature presentation. |
| Interactive Menus |
A series of screens which a viewer navigates through in order to select different features and options on a DVD. |
| Interframe Compression |
A type of compression that compares data in one frame to data in another. |
| Interlacing |
Combining two sets of field lines (“odd-numbered” rows and “even-numbered” rows) to create a single video image. |
| Intraframe Compression |
A type of compression that compares data in one frame to itself; this is used for key frames, which must reconstruct an image without referring to any other frames. |
| Intro |
A short video clip at the start of a DVD. |
| ISO |
International Standard for Organization. A committee that develops standards which products and services need to meet. Each set of standards is numbered; for example, ISO 9660 deals with the volume and file structures of CD-ROMs, and ISO 9642 deals with time and control codes for 24, 25 and 30 fps motion-picture systems. |
| ISO 9660 |
A CD-ROM with a file system that meets ISO 9660 standards can be read in any PC, Mac or similar computer platform. There are three “levels” in the ISO 9660 standard:
- Level 1: Files must be a single continuous stream of bytes (they cannot be fragmented), and must conform to the “8-dot-3” file naming structure (the name of a file cannot be more than eight characters long, and the file extension cannot be more than three characters long—budget06.xls, nwslettr.doc, etc.).
- Level 2: The same as Level 1, only there are no restrictions on file names.
- Level 3: No restrictions on file fragmentation or file names.
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| ISO 9660 Image |
An image file (see IMG) which is ISO 9660-compliant. |
| Isolated Music Score |
A separate audio track in a movie with nothing but the music. This separation is done to prevent the music from overwhelming the dialogue or sound effects. |
| ISRC |
International Standard Recording Code. A 12-character code which is sometimes added to an audio track on a CD, identifying the track’s country of origin, owner/registrant, year of recording and serial number. |
| IVTC |
Inverse Telecine. A codec that changes 29.97 fps NTSC video back into 24 fps film. |
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J |
| Jewel Case |
A transparent plastic CD case. |
| Joliet |
An ISO 9660 extension that allows Windows files to exceed the “8-dot-3” naming restriction. With this improvement, the file names can be up to 64 characters long and include spaces. |
| JPEG |
Joint Photographic Expert Group (file extension: .jpg or .jpeg). A compressed image format which works very well on color pictures. |
| Jump |
An anomaly that causes a CD or DVD to skip forward during playback. |
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K |
| Karaoke |
A DVD format that combines audio tracks with text. In the proper player, the text (usually the lyrics to the audio tracks) is displayed on a screen and highlighted in real time, allowing people to sing along. |
| Key Frame |
A video frame with all the data for a single image. They are always the first frame of a video file and can be inserted at any point to avoid image degradation. |
| Kodak Picture CD |
A CD with pictures stored on it in JPEG format, along with proprietary Kodak software for viewing, enhancing and printing. |
| KVCD |
K Video Compression Dynamics. A modified MPEG compression method allowing more than two hours of video to be stored on a CD-R or CD-RW. Since KVCD is not an “official” DVD format, there are no guarantees that a DVD player will be able to play one of these discs.
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