SVCD，應該是指大陸那邊所展的格式，由VCD改良的吧，可能是不想被DVD聯盟收取權利金，又想以人口決定市場、規格，只有二聲道....

補充說明：剛好查到的資料
Super Video CD: SVCD is an extension of the VCD standard which uses MPEG-2 compression with variable bit
rate encoding, and also allows a bitrate that is twice that of VCD. Therefore, SVCD also offers better image quality,
although it means less total playing time if the full bandwidth is used. At DVD quality, a SVCD can store up to 35
minutes of video, compared to 70 minutes for VCD MPEG-1 quality. Nero itself does not support encoding to
MPEG. It requires MPEG files that are already prepared for VCD or SVCD. This can be done with third-party
programs such as Ulead VideoStudio MPEG Encoder. Both PAL and NTSC standards are supported.