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

[Arpi]

Hi,

> > 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
no. it's teh maximum error of filesize approximation. it doesn't mean it
will produce smaller files, just that it _may_ produce smaller...

> 	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.
1-pass is ABR (average bitrate,  a.k.a. short-term VBR), 2-pass is VBR but
with fixed size calculated from specified bitrate


A'rpi / Astral & ESP-team

--
Developer of MPlayer, the Movie Player for Linux - http://www.MPlayerHQ.hu