Re: How to configure AudioConverter to write VBR?
Re: How to configure AudioConverter to write VBR?
- Subject: Re: How to configure AudioConverter to write VBR?
- From: Jens Alfke <email@hidden>
- Date: Tue, 10 Feb 2009 09:15:34 -0800
Thanks a ton for elucidating this, Bill! I've read it over a few
times, and here's my understanding; is this accurate?
• Setting CodecQuality affects only the speed of encoding and the
audio quality, not the file size.
• Setting the BitRateStrategy to CBR, ABR or Constrained VBR should
have small effects on the file size, while altering the audio quality
(and presumably the encoding time, too?) The bit rate will vary around
the BitRate setting. The SoundQualityForVBR is ignored.
• Setting the BitRateStrategy to VBR will cause the bit-rate and file
size to vary greatly depending on the SoundQualityForVBR setting. The
BitRate setting is ignored.
Now I'm thinking of what this means for my UI. It seems like there are
two disjoint modes — either the user can select a target bit-rate and
optionally enable two levels of constrained VBR; or the user can
enable Full Gonzo VBR and set an audio quality level, but not a
bitrate. Independently, they could could also adjust a "faster vs.
better sound" slider.
This seems like a lot of widgets for a consumer-type app … I wonder if
both the bitrate-centric and quality-centric modes are necessary. The
quality-centric one seems nice for nontechnical users, but if I just
have that, I know I'll get lots of people asking "where do I set the
bitrate?"
—Jens
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