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I am hoping to finally watch the Star Wars movies (yes, yes, I know) and intend to watch them all in a row as a marathon. I would prefer not to have to constantly get up and change discs, so I thought it would be convenient if I could rip my discs to AVI files and put them on a single DVD+RW (6 movies × 700MB = 4200MB; DVD+RW = 4482MB, leaving enough space for some extras or rather to make them each 747MB or—somehow—dynamically adjusting their sizes to fit).

I ripped one of the movies to the hard-drive (yes, I took encryption into consideration), and ran it through AutoGK, making sure to select 700MB for the size.

Unfortunately the end result was not 700MB in fact, at 660MB, it was not even sort of close. I tried a different one and got a 750MB file.

Whenever “the Scene” releases an (XviD) video, they always seem to get it almost exactly at the target size, give or take perhaps two three megabytes at most.

I was going to try AVIDemux, but the latest version doesn’t seem to be of much use for this. Yes, I have seen plenty of (overly) simple programs, including free ones, but I don’t trust their quality—even though the converted files are temporary this time, I don’t want to have cheap, poor quality if I don’t have to.

How do they get such tight results?

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If you can live with fixed bitrate encoding then all you have to do is calculate the bit rate needed to squeeze x seconds into y MB or y ⨉ 8 MBit. Then, encode with that bitrate. However, I don't know the specifics of these moviez encodings. Ideally they should have some kind of guidelines on what encoder and which settings to use. – slhck Oct 6 '12 at 19:34
I have had good luck with MeGUI, but you need to use a bitrate calculator to get the size you want. Though trying to fit 6 full length movies on one dvd is really going to effect quality. – Logman Oct 6 '12 at 19:59
you might want to use MediaInfo to check videos you do have, it will give you complete information about the the video & audio...including what application was used to create the video. – Logman Oct 6 '12 at 20:03
I believe this scene rule would be of interest to you. – slhck Oct 6 '12 at 22:52
@slhck, that looks promising (if lengthy). I’ll give it a try. – Synetech Oct 6 '12 at 23:46

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