AVI is a container file. AVI is usually associated with an uncompressed audio video stream, hence Audio Video Interface. MPEG is a compression standard, designed by the Motion Picture Experts Group. MPEG1 uses iDCT compression routines and has a max resolution of 352x240NTSC. MPEG2 also uses iDCT compression with motion compensation and prediction. This was designed with quality in mind, for DVD HDTV in particular. Max resolution is 720x480NTSC. MPEG4, aka Windows Media 7+8, 3ivX, DivX, DivX Deux, etc. MPEG 4 is designed for streaming applications like broadcast media and internet streaming. Once again based on the aging iDCT compression, but adds a whole slew of object recognition, motion prediction. DivX happens to use the AVI format as it's container file, do not confuse the two.
In terms of quality, uncompressed AVI has the edge over anything, MPEG1 is ok quality, MPEG2 is ovisouly the best picture quality to compression ratio. MPEG4 and the like have excellent compression ratio's, however lack the full picture quality of MPEG2 and tax the CPU during decompression.
VCD is MPEG1 @ 352x240@ 29.97fps
SVCD is VBR MPEG2 @ 480x480 which is resized to 640x480 on playing.
There are defined standards for the bitrates and audio rates of *VCD formats.
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