| 06_taro |
2011-12-19 15:44 |
qtaac有名为"mode"的opt，faac没有。要么换qtaac，要么把--aextraopt mode=cbr去掉。在指定了--abitrate的情况下默认会自动转成abr的。aextraopt的用法倒是没问题，就是--aextraopt xxx=param这样用的。
另外2120+630的build内32位版可以用qtaac，只不过一时失误没显示出来qtaac的help，需要的看下面：
- * qtaac encoder help
--aquality VBR quality [63]
Cannot be used for HE-AAC and possible values are:
0, 9 ,18 ,27 ,36 ,45 ,54 ,63 ,73, 82, 91, 100, 109, 118, 127
0 is lowest and 127 is highest.
--abitrate Enables bitrate mode
Bitrate should be one of the discrete preset values depending on
profile, channels count, and samplerate.
Examples for typical configurations
- for 44100Hz or 48000Hz with 1ch
LC: 32, 40, 48, 56, 64, 72, 80, 96, 112, 128, 144, 160, 192, 224, 256
HE: 16, 24, 32, 40
- for 44100Hz or 48000Hz with 2ch
LC: 64, 72, 80, 96, 112, 128, 144, 160, 192, 224, 256, 288, 320
HE: 32, 40, 48, 56, 64, 80
- for 44100Hz or 48000Hz with 5.1ch
LC: 160, 192, 224, 256, 288, 320, 384, 448, 512, 576, 640, 768
HE: 80, 96, 112, 128, 160, 192
The lower samplerate, the lower min/max values are applied
--asamplerate Output samplerate
LC: 8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000
HE: 32000, 44100, 48000
Samplerate greater than input is not supported
--acodec-quality Encoder's internal complexity [0]
0 (medium), 1 (high), 2 (highest)
--aextraopt Profile and bitrate mode
sbr : enable HE-AAC encoding [0]
mode : bitrate control mode [abr]
"abr", "cbr", "cvbr"
--aquality/--abitrate setting may be changed inside codec due to its
limitations and extreme resampling settings (e.g. 48000->8000) may not work.
If something goes wrong, it will result in a failure of codec initialization.
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