[Ffmpeg-devel] [PATCH] vbr audio encode

Michael Niedermayer michaelni
Sun Aug 21 22:27:51 CEST 2005


On Sun, Aug 14, 2005 at 01:10:55AM -0400, Justin Ruggles wrote:
> Michael Niedermayer wrote:
> > iam not sure though if this is worth the work, maybe we should just
> > drop the normalized scale support idea ...
> Here is an updated patch without normalized scale, and with added
> support for faac.  But faac is weird.  It doesn't have CBR as an option
> at all, only VBR or ABR.  When bitrate is set to zero, it uses purely
> VBR based on the quality factor only.  But even the ABR is based
> partially on the quality factor.  The result is that the '-ab' option
> only really works accurately between about 100kbps and 200kbps for
> stereo input.  The default quality of 100 limits the output bitrate
> range.  It would be a nightmare to try to add support for adjusting both
> bitrate and quality without breaking the intended function of other codecs.




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