[MPlayer-users] file sizes with and without B frames

[Steffen Barszus]

Am Mittwoch, 7. August 2002 20:18 schrieb Steven M. Schultz:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>
> > From: Arpi <arpi at thot.banki.hu>
> >
> > hmm? you use fixed bitrate - and filesize depends only on bitrate, so why
> > should it be different? quality and cpu usage will differ for IP and IPB,
> > but the file size won't unless you change bitrate...
>
> 	I thought 'vbitrate' set the desired maximum limit - and that the
> 	actual bitrate was variable (VBR).   It was a surprise to find such a
> 	small difference between the B and non-B cases - that's all.
>
> 	Is the lavc encoding VBR or CBR?   If it's CBR then yes  I understand
> 	the filesize being constant and depending only on the bitrate.
>
> 	Thanks.
>
> 	Steven Schultz
> 	sms at 2bsd.com
>
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As I understood it, its a kind of vbr, since it always use more bitrate if 
there is fast motion and take fewer if there is low motion. The result of 
your test shows only how good the codec can handle it. Think -vhq should show 
a difference ? 

Greets

Steffen

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