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[请教]用LAME压MP3时的-q参数使用...
gundamboy@2004-06-02 19:50
官方的说法是-h就是注重质量的了,相当于-q 2,不过和-v的参数一样最高值都是0,请问一下-q 2和-q 0在音质上会有差别吗?应该用-q 2好,还是-q 0好?
nature@2004-06-02 21:02
现在都用--preset medium/standard/extreme/insane ...
或者给定速率下的最高质量: --preset abr xxx
zijin1983@2004-06-02 21:02
* -h high quality
Use some quality improvements. Encoding will be slower, but the result will be of higher quality. The behaviour is the same as the -q2 switch.
This switch is always enabled when using VBR.
* -q 0..9 algorithm quality selection
Bitrate is of course the main influence on quality. The higher the bitrate, the higher the quality. But for a given bitrate, we have a choice of algorithms to determine the best scalefactors and huffman encoding (noise shaping).
-q 0: use slowest & best possible version of all algorithms. -q 0 and -q 1 are slow and may not produce significantly higher quality.
-q 2: recommended. Same as -h.
-q 5: default value. Good speed, reasonable quality.
-q 7: same as -f. Very fast, ok quality. (psycho acoustics are used for pre-echo & M/S, but no noise shaping is done.
-q 9: disables almost all algorithms including psy-model. poor quality.
以上是官方的东西……
看来看去…… 我觉得讨论这个问题,跟讨论“ape和320cbr哪个好?”或者“mpc没必要压Q10的吧?我觉得Q5已经很好了~” 同出一辙……
gzzwei@2004-06-03 22:21
CBR参数:
--alt-preset cbr
(可用Bitrate:80、96、112、128、160、192、224、256、320)
最高品质参数:
--alt-preset insane或者--alt-preset cbr 320
320k CBR,音质最好,文件体积最大
VBR参数:
1.--alt-preset extreme
220-270k左右的VBR,音质与上面参数相仿,但文件体积小25%,推荐此参数
2.--alt-preset fast extreme
音质比上面参数稍微差一些
3.--alt-preset standard
180-220k左右的VBR,在音质和文件大小之间比较好的平衡
4.--alt-preset fast standard
音质比上面参数稍微差一些
5.--alt-preset standard -Y
虽然品质稍差,但文件体积非常小
lohengramn@2004-06-03 22:32
虽然看起来q0 比q2更好,但是记得以前看过一片文章说
q0还是试验参数,算法可能还存在问题,推荐使用q2
btw,这个q参数和bitrate完全是2个不同的概念阿
goddesschi@2004-06-04 00:25
嗯嗯...
只用過-h.其他的都沒試過.以上的資料很用嘗試的價值^.^
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