1.35 gb avi file cuts irregularly bigger then 700 mb?

[bouker]

Ok guys here is my problem and quite honestly its stumped me.
Ive recently ripped and converted a movie using virtual dub with the new divx 6 codec using its multi-pass modulation system which ive never used before. I set the bitrate using a bitrate calc to 1322 to properly fit under a 2 cd rip or 1400 mb. I ran it at 2 passes and came out wiht a resulting video at a filesize of 1.35 gb. Movies is about 2 hrs 7 min 56 sec. Wut i cannot understand is wen i tried ot cut it up using virtual dub = checking the amount of frames and cutting it up evenly i get a resulting video thats around 720. Never happened before. Then thinking i was doing something wrong, i used a program called: "AVI MPEG ASF WMV Splitter" and set it to split the resulting two fiels into even files below 700 of course. cd 1 came out to be over 720. Why would this be happening? Is it something resulting from the frames, or the multi pass somehow? Thanx

[celtic_druid]

With a VBR encoding if you cut in half time wise then the chances are that it will be off size wise. Also you can only cut on keyframes. So if there is no keyframe between 700MB's and 720MB's then you have to cut at 720 or before 700.

[bouker]

thanks man. When i cut up my videos i ususally find how many frames there are, like, say there were 9000 frames id cut it up at the 4500 mark so id get an even cd 1 and 2. However, as i said, in this case it didnt work. Even wen i went back a frame or a few the filesize didnt adjust dramatically...wut i ended up doing was going back a whole minute and i was able to get it down to 700. oh well. ty for the help mate

[junkmalle]

Use VirtualDubMod for cutting. It shows you the position within the file in megabytes as well as time.

[celtic_druid]

Yep, it also has a goto last keyframe... features so you can jump straight to the last keyframe before 700MB's. Like I said with VBR encoding the halfway point timewise is not likely to also be the half way point size wise since it is unlikely that the first half of a movie is exactly compressable as the last half which has credits.

[jimmalenko]

Yes, if doing a CBR encode, then you could simply use the number of frames as the halfway point in terms of size. With VBR it's a lot more difficult for the reasons as stated above, although virtualdub does simplify the process somewhat.

The other thing you can do which may help you in the future is use virtualdubmod, and when specifying your filename, invoke the "segment" section and set it to 695MB or thereabouts. This will save you having to split afterwards.