cDVD discs, also known as mini-DVD discs (not to be confused with 8 cm DVDs), are regular data CDs that contain

MPEG-2 MPEG-2 (a.k.a. H.222/H.262 as was defined by the ITU) is a standard for "the generic coding of moving pictures and associated audio information". It describes a combination of lossy video compression and lossy audio data compression methods, w ...

MPEG-1 MPEG-1 is a standard for lossy compression of video and audio. It is designed to compress VHS-quality raw digital video and CD audio down to about 1.5 Mbit/s (26:1 and 6:1 compression ratios respectively) without excessive quality loss, mak ...

video structured in accordance with the

DVD-Video DVD-Video is a consumer video format used to store digital video on DVD discs. DVD-Video was the dominant consumer home video format in Asia, North America, Europe, and Australia in the 2000s until it was supplanted by the high-definition Bl ...

specifications (namely, a VIDEO_TS directory containing properly-authored IFO/BUP and VOB files). Such discs must be written in the so-called " Mode 1", which is compatible with both the

ISO 9660 ISO 9660 (also known as ECMA-119) is a file system for optical disc media. Being sold by the International Organization for Standardization (ISO) the file system is considered an international technical standard. Since the specification is ...

and UDF 1.02 filesystems, and therefore limits the amount of data that can be stored on an 80-minute CD to 700 MB. By using non-standard resolutions, long GOPs, more B-frames, and high-compression quantization matrices, it is possible to store up to 2 hours of video with audio and subtitles on a regular 80-minute CD. Until 2003, few standalone DVD-players had drives capable of spinning a CD at the 8X rate needed to keep up with the maximum data stream allowed by the DVD-Video specifications, but today, many models contain drives similar to those used on desktop computers, and more versatile

firmware In computing, firmware is a specific class of computer software that provides the low-level control for a device's specific hardware. Firmware, such as the BIOS of a personal computer, may contain basic functions of a device, and may provide ...

as well, so that the proper playback of compact DVDs is often supported, but rarely documented (especially in North America and Europe).

References

External links

ViDEOHelp.com
120 mm discs Video storage {{compu-storage-stub

See also

References

External links