eXtended VideoCD

A format for storing video on CD-ROM. Known as XVCD for short, eXtended VideoCD is an unofficial extension of the popular VideoCD format and uses the same codec (MPEG-1), but can use higher bitrates and resolutions to increase video quality. For instance, XVCD can use PAL and NTSC resolutions instead of the standard CIF. Because it is not an officially recognised standard, compatibility with standalone DVD players is not universal.

Technical Details:

PAL:

• Video: MPEG-1 constant and variable bitrate, 352x288, 25fps
• Audio: MPEG-1 Layer II, 32-384Kbps
• Extra: menus and chapters, still pictures @ 704x576 and 352x288

NTSC/NTSC Film:

• Video: MPEG-1 constant and variable bitrate, 352x240, 29.97fps (23.976fps for NTSC Film)
• Audio: MPEG-1 Layer II, 32-384Kbps
• Extra: menus and chapters, still pictures @ 704x576 and 352x288

Source:
VCDHelp - http://www.vcdhelp.com