Mark Taylor wrote:
> -Y enables the true noise shaping VBR mode. It should give
> similar results to #1, but be much faster.
Not similar results at all. -Y is producing much larger files with less spread across
the
bitrates. A graph of the -Y results doesn't look natural in my opinion with the sharp
drop
after 160. There is also less change to average bitrates when changing -V values.
-V9 just
droped the average by 20kb/s as shown (5 minute song).
Standard VBR (-V4 -mj)
0 - 0 - 0.0%
32 - 45 - 0.3%
40 - 21 - 0.2%
48 - 16 - 0.1%
56 - 24 - 0.2%
64 - 63 - 0.5%
80 - 379 - 2.9%
96 - 1407 - 10.8%
112 - 4719 - 36.3%
128 - 4188 - 32.2%
160 - 1064 - 8.2%
192 - 587 - 4.5%
224 - 306 - 2.4%
256 - 151 - 1.2%
320 - 40 - 0.3%
Average bitrate: 126.2
(-V4 -Y -mj)
0 - 0 - 0.0%
32 - 24 - 0.2%
40 - 3 - 0.0%
48 - 4 - 0.0%
56 - 9 - 0.1%
64 - 42 - 0.3%
80 - 178 - 1.4%
96 - 588 - 4.5%
112 - 1912 - 14.7%
128 - 3806 - 29.3%
160 - 5187 - 39.9%
192 - 641 - 4.9%
224 - 293 - 2.3%
256 - 210 - 1.6%
320 - 113 - 0.9%
Average bitrate: 144.9
(-V9 -Y -mj)
32 - 27 - 0.2%
40 - 3 - 0.0%
48 - 44 - 0.3%
56 - 69 - 0.5%
64 - 90 - 0.7%
80 - 709 - 5.4%
96 - 1408 - 10.8%
112 - 3220 - 24.8%
128 - 4969 - 38.2%
160 - 1810 - 13.9%
192 - 499 - 3.8%
224 - 156 - 1.2%
256 - 6 - 0.0%
320 - 0 - 0.0%
Average bitrate: 124.8
Ross.
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