[Ffmpeg-devel] [PATCH] vbr audio encode

Michael Niedermayer michaelni
Fri Sep 2 13:09:06 CEST 2005


On Tue, Aug 23, 2005 at 10:03:09AM -0400, Justin Ruggles wrote:
> Michael Niedermayer wrote:
> > applied
> great! i like the changes too.
> so, now that ogg is fixed, might as well update the vorbis codec as
> well.  since the aq value is passed directly to libvorbisenc, it uses
> -0.1 to 1.0 instead of -1 to 10 like oggenc.  apparently fixed-quality
> vbr encoding in vorbis doesn't have to save up audio samples to analyze
> before sending out vorbis packets, so the encoding is faster & looks
> nicer too (no "time=100000000000.0").  with an 18-second test clip, my
> (slow) computer took 1m30s with abr and only 30s with vbr.  both results
> had very close average bitrates.
> patch attached.  also updated vorbis time base.




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