# [MPlayer-users] I wrote a mencoder mini-guide for DVD ripping

Julien WAJSBERG flash at minet.net
Fri Aug 23 23:59:01 CEST 2002

```Mmm I didn't write the whole mail, because I have to correct something :)

1 KB = 1KBytes = 1024 Bytes
1 Kb = 1 Kbit = 1000 bits

(in french, KB = ko, that's less confusing :)
--
Flash

On Fri, 23 Aug 2002, Ralph Slooten wrote:

> Hi there Nico (and of course the rest),
>
> Firstly I must say "thank you" for writing quite a usefull guide to
> mencoder. This is not because I don't know how to use it, but because I get
> bomboarded with general questions by people regarding the howto with dvd
> ripping ;-) I too generally tell them to use mencoder and RTFM first before
>
> One BIG thing I must point out here about your script you included in your
> guide... it's totally wrong ;-) Yes I see where you are going with it, but
> I will explain.
>
> You are going about your calculations in Kb, and not kb (note the K-k) as
> you state. There is a difference... a BIG difference. 1Kb (as used with
> your CD size) = 1024 bytes, agreed, however both mp3 and DivX (version 4
> upwards, including open-divx, xvid, libavcodec, blaah blaah blaah) work in
> kb's ... as in 1kb = 1000bytes.
>
> This makes your equasion a hell of a lot more complicated, trust me, I
> know..  as I'm the author of DivX Calc
> mistake you have, and it took me a day or so to work out a suitable
> calculation. At the end of it I was working out everything in bytes,
> including the CD-Size... :-/ Basically you are forced to convert everything
> to bytes.
>
> I tried your script to show you the difference. I took an example from The
> Matrix, which is 131 minutes. With your script it tells me to use 584b/s.
> Given your calculation this would give me a film size of 684MB's, which is
> reasonable, BUT incorrect. Actually this bitrate would give a total
> filesize of 668MB's, using a correct calculation.
>
> To get a filesize of of 684MB's you would actually need a bitrate of 601,
> and not 584. Looks like little, but is a lot on a 131 minute film.
>
> Hope this helps correct things ;-)
>
> Greetings
> Ralph
>
> --
> Homepage: http://tuxpower.f2g.net/
>
>
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