Editing Video CD (section)

== Similar formats ==

=== CD-i Digital Video ===
Shortly before the advent of White Book VCD, Philips started releasing movies in the [[Green Book (CD-interactive standard)|Green Book]] [[CD-i]] format, calling the subformat CD-i Digital Video (CD-i DV). While these used a similar format (MPEG-1), due to minor differences between the standards these discs are not compatible with VCD players. Philips' CD-i players with the Full Motion Video MPEG-1 decoder cartridge would play both formats. Approximately 30 CD-i DV titles were released before the company switched to the current VCD format for publishing movies in 1994.

=== XVCD ===
'''XVCD''' (eXtended Video CD) is the name generally given to any format that stores MPEG-1 video on a compact disc in CD-ROM XA Mode 2 Form 2, but does not strictly follow the VCD standard in terms of the encoding of the video or audio.

A normal VCD is encoded to MPEG-1 at a constant bit rate (CBR), so all scenes are required to use exactly the same data rate, regardless of complexity. However, video on an XVCD is typically encoded at a variable bit rate (VBR), so complex scenes can use a much higher data rate for a short time, while simpler scenes will use lower data rates. Some XVCDs use lower bitrates in order to fit longer videos onto the disc, while others use higher bitrates to improve quality. MPEG-2 may be used instead of MPEG-1.

To further reduce the data rate without significantly reducing quality, the size of the [[Group of pictures|GOP]] can be increased, a different MPEG-1 [[quantization (image processing)#Quantization matrices|quantization matrix]] can be used, the maximum data rate can be exceeded, and the bit rate of the MP2 audio can be reduced or even be swapped out completely for MP3 audio. These changes can be advantageous for those who want to either maximize video quality, or use fewer discs.

=== KVCD ===
'''KVCD''' (K Video Compression Dynamics) is an XVCD variant that requires the use of a [[software patent|proprietary]] [[quantization matrix]], created by Karl Wagner and made available for non-commercial use. In addition to standard VCD resolutions, KVCD allows for non-standard resolutions like 528×480/576, though hardware support for KVCDs authored with these resolutions is limited.<ref>{{Citation | title = DVD Compatibility Chart | date= February 25, 2007 | url = http://www.kvcd.net/portal/articles.php?lng=en&pg=19 | access-date = 2008-02-22 }}</ref>

=== DVCD ===
'''DVCD''' or Double VCD is a method to accommodate longer videos on a CD. A non-standard CD is [[overburn]]ed to include up to 100 minutes of video. However, some CD-ROM drives and players have problems reading these CDs, mostly because the groove spacing is outside specifications and the player's laser servo is unable to track it.

=== DVI ===
'''DVI''' ([[Digital Video Interactive]]) is a compression technique that stored 72 minutes of video on a [[CD-ROM]]. In 1998, [[Intel]] acquired the technology from [[RCA]]'s Sarnoff Research Labs. DVI never caught on.<ref>{{citation|title=Definition of: DVI| url=https://www.pcmag.com/encyclopedia_term/0,1237,t=DVI&i=42144,00.asp | work=PC Magazine}}</ref>

===SVCD===
[[Super Video CD]] is a format intended to be the successor of VCD, offering better quality of image and sound. The format uses [[MPEG-2]] video at 480x480 or 480x576 and supports multiple bitrate and channel options for encoding audio.