Encoding long movies with XviD...

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Encoding long movies with XviD...

Postby Bushido Philosopher » Thu Nov 28, 2002 11:04 am

Ok, seeing the results of XviD on my music videos I wanted to try it out on long movies that are like 2 hrs long. I tried this out but a lot of questions came up when trying it out...

When I finish the 1st pass of the encode, the file is 927MB. Of course I'm trying to fit it to a 700MB CD. When I plug in the formula to make it re-size, is this counting the audio? The first pass I did not encode the audio with it...maybe I should have...

So is there like a guide to specifiically do this type of thing? Or can anyone give me some advice?
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Postby Beowulf » Thu Nov 28, 2002 1:15 pm

Well if you have good source, then you want 70% of your first pass for your second one.

70% of 927 is 648, but that doesnt leave enough room for audio. If you want descent audio go with 128kbs.

A 128kbs mp3 thats two hours long, takes up about 111 megabytes. So just set your 2nd pass to be 589.

Should work :) You might wanna set your size to something like 580 just in case of codec error. It would suck to spend a trillion years encoding a worthless file that came out to be 702 megs :(

Hope that helps 8)
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Postby TokyoU15 » Thu Nov 28, 2002 2:01 pm

just zip a 702 mb file. lol :P
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Postby klinky » Thu Nov 28, 2002 5:49 pm

Get a bitrate calculator, good ones should tell you how much audio data is used by what bitrate you input.

Of course it's a simple formula.

<bitrate> / 8 = KBperSec

KBperSec * 60 = KBperMin

KBperMin * 60 = KBperHour

Usually you can just stop at KBperMin and just go

KBperMin * TotalMovieMinuteLength = TotalAudioKBData

TotalAudioKBData / 1024 = TotalAudioMBData.


So it's pretty simple, just a couple recursions. There are some nice bitrate calcs that do this for you though. To answer your question in XviD when you do the two pass, specify a filesize routine, it DOES NOT count audio. All it does is keep the video stream in check.


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