Re: [dvd::rip] incorrect bitrate calculation for divx4

[Thomas Oestreich <ostreich@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

On Fri, 18 Jan 2002, Christian Lambert wrote:

>
> Noticed that your movies are a little undersized?
>
> The Divx4 codec assume that 1kbit = 1000 bits (not 1024 bits)
> so if you take this into account, the bitrate that transcode
> or dvdrip propose is always a little lower than what it should
> be and therefore result in slightly undersized movies.

Hi,

estimated bitrate (1kbit = 1000 bit) is:
(bitrate.c) bitrate = (video[MB]/time[s]) * ((double) (1024 * 1024 * 8))/
1000;

passed to divx4 as:
(export_divx4.c) divx->bitrate   = bitrate*1000;

What's wrong with it?
Thomas.

>
> The divx3 codec assumed that 1kbit = 1024 bits.
>
> http://www.doom9.org/divx4calc.htm
>
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-------------------------------------------------------
Dr. Thomas Östreich
Institute for Theoretical Physics
University of Göttingen
fone: +49 (0)551 397684 | fax: +49 (0)551 399263
e-mail: ostreich@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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