DataFlow> could anyone tell me what the difference is between ABR and VBR?
Ross> Do a search of the mail list archive where it has been discussed in
detail.
Or more basically, take a look at 'Usage' document in the source, please.
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average bitrate encoding (aka Safe VBR)
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--abr n
turns on encoding with a targeted average bitrate of n kbits, allowing
to use frames of different sizes. The allowed range of n is 4-310,
you can use any integer value within that range.
It can be combined with the -b and -B switches like
lame --abr 123 -b 64 -B 192 a.wav a.mp3
which would limit the allowed frame sizes between 64 and 192 kbits.
Using -B is NOT RECOMMENDED. A 128kbs CBR bitstream, because of the
bit reservoir, can actually have frames which use as many bits as a
320kbs frame. VBR modes minimize the use of the bit reservoir, and
thus need to allow 320kbs frames to get the same flexability as CBR
streams.
Cheers,
Keeshond
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