what's the difference between vga to Qvga?

[mischief]

also what's the difference between "1-pass" to "2-pass" to "avisynth" to "advanced"?
i have 30g video ipod if that means anything..

[msopnet]

vga is more TV Sized, it will get up to twice as big as QVGA.

2-pass gives significantly higher quality video than 1-pass (so you can set the bitrate to be lower). This is because the first 'pass' is used to determine what parts of the video need high bitrates and which need low. That is, it will give a higher bitrate to a fast motion scene in The Matrix, than in a scene where two people are talking.

AVISynth is generally used for problem videos.

Advanced adds command line options to FFMPEG to give higher quality output... which also makes it take longer. It adds too many command line options to describe them all.

[Midiman]

Speaking purely technically, VGA (Video Graphics Array) is 640x480 (307200 pixels). QVGA (Quartrer VGA) is 320x240 (76800 pixels - note that even though the resolution is HALF, it's in two dimensions which makes it a QUARTER). The use of these terms in Videora's conversion profiles is merely a "ball park" reference.