[MPlayer-users] vbitrate estimation using 3 pass encoding (divx)

[christopher j bottaro]

ahh, its it clear now, thank you.  so if you scale a movie down to something 
smaller while keeping the bitrate constant, the quality will get better 
because now some of those bit can be used for higher quality rather than 
drawing a bigger movie?

sorry my digital movie terminology is terrible...=)

thanks,
-- christopher

On Sunday 05 January 2003 06:18 pm, D Richard Felker III wrote:
> Bitrate is exactly what it sounds like, the number of bits to be used
> per second. Given the bitrate, the final file size depends only on the
> length of the movie (in time). Changing the framerate or the scale
> doesn't change the length of the movie, so it shouldn't affect the
> file size.
>
> With that being said...sometimes the encoder will not use all the bits
> you tell it to (with the vbitrate option) if it doesn't think they're
> necessary. This may be what's happening in your case with low
> framerate or scaling. But all that means is that the actual bitrate
> isn't coming out as high as you requested. See the bitrate mencoder
> prints when it finishes and that will tell you what the real average
> bitrate ended up being.
>
> Rich
>
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