cDVD discs, also known as mini-DVD
discs (not to be confused with
8 cm DVDs), are regular
data CDs that contain
MPEG-2 or
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, making ...
video structured in accordance with the
DVD-Video 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-frame
In the field of video compression a video frame is compressed using different algorithms with different advantages and disadvantages, centered mainly around amount of data compression. These different algorithms for video frames are called pi ...
s, 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 as well, so that the proper playback of compact DVDs is often supported, but rarely documented (especially in North America and Europe).
See also
*
Video CD
Video CD (abbreviated as VCD, and also known as Compact Disc Digital Video) is a home video format and the first format for distributing films on standard optical discs. The format was widely adopted in Southeast Asia, Central Asia and the ...
(VCD) and
Super Video CD (SVCD) - standards for video on CDs
*
BD9 & BD5 -
Blu-ray Disc Movie content on DVDs, explicitly allowed by the Blu-ray standard
*
AVCHD
AVCHD (Advanced Video Coding High Definition) is a file-based format for the digital recording and playback of high-definition video. It is H.264 and Dolby AC-3 packaged into the MPEG transport stream, with a set of constraints designed around t ...
- a digital video specification loosely based on BDMV which can also be played from Blu-ray and non-Blu-ray sources
*
MiniDVD
MiniDVD (also Mini DVD or miniDVD) is a DVD disc which is in diameter. Most MiniDVDs hold 1.4 GB of data, but there are variants that hold up to 5.2 GB. The MiniDVD is also known as a "3 inch DVD", referring to its approximate diameter in inc ...
- 8 cm DVDs
References
External links
ViDEOHelp.com
120 mm discs
Video storage
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