afconvert 音频格式转换使用相关
有点凌乱,先收集着 ,有时间再整理好了.
//wav转caf
http://www.yifeiyang.net/iphone-development-skills-of-tool-papers-4-wav-file-conversion-using-afconvert/
//音频方面的详解介绍
http://www.cnblogs.com/bandok123/archive/2012/03/02/2377023.html
//外国佬也遇到这类问题 caf 转mp3
http://stackoverflow.com/questions/435349/how-to-use-afconvert-to-convert-from-caf-to-mp3-format
//苹果官网关于音频的参考库
http://www.apple.com.cn/developer/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/AudioandVideoTechnologies/AudioandVideoTechnologies.html
//命令位置
/Applications/Utilities/终端.app
//查看某个音频的具体参数
afinfo /Users/amarishuyi/Desktop/sound1.mp3
//查看具体支持的转换格式
afconvert -hf
//CAF 转换成MP3 (可以)
afconvert -f mp4f -d aac -b 128000 /Users/amarishuyi/Desktop/sound1.caf/Users/amarishuyi/Desktop/sound1.mp3
//amr 转换成caf (可以)
afconvert -f caff -d LEI16 -b 128000 /Users/amarishuyi/Desktop/1.amr /Users/amarishuyi/Desktop/1.caf
//CAF转换成AMR (还转不了)
afconvert -f amrf -d samr -b 128000 /Users/amarishuyi/Desktop/sound1.caf/Users/amarishuyi/Desktop/sound1.amr
afconvert -f amrf -d samr /Users/amarishuyi/Desktop/sound1.caf /Users/amarishuyi/Desktop/sound1.amr
File: /Users/amarishuyi/Desktop/1.amr
File type ID: amrf
Data format: 1 ch, 8000 Hz, 'samr' (0x00000000) 0 bits/channel, 0 bytes/packet, 2400 frames/packet, 0 bytes/frame
no channel layout.
estimated duration: 8.380000 sec
audio bytes: 13408
audio packets: 28
bit rate: 12769 bits per second
packet size upper bound: 480
audio data file offset: 6
optimized
File: /Users/amarishuyi/Desktop/sound1.caf
File type ID: caff
Data format: 2 ch, 44100 Hz, 'ima4' (0x00000000) 0 bits/channel, 68 bytes/packet, 64 frames/packet, 0 bytes/frame
no channel layout.
estimated duration: 2.860408 sec
audio bytes: 134096
audio packets: 1972
audio 126144 valid frames + 0 priming + 64 remainder = 126208
bit rate: 374850 bits per second
packet size upper bound: 68
audio data file offset: 4096
optimized
source bit depth: I16
sound check:
approximate duration in seconds 2.86
source bit depth I16
----
File: /Users/amarishuyi/Desktop/sound1.mp3
File type ID: MPG3
Data format: 2 ch, 48000 Hz, '.mp3' (0x00000000) 0 bits/channel, 0 bytes/packet, 1152 frames/packet, 0 bytes/frame
no channel layout.
estimated duration: 1.030786 sec
audio bytes: 14431
audio packets: 1
bit rate: 112000 bits per second
packet size upper bound: 968
maximum packet size: 336
audio data file offset: 27631
optimized
----
File: /Users/amarishuyi/Desktop/1.caf
File type ID: caff
Data format: 1 ch, 8000 Hz, 'lpcm' (0x0000000C) 16-bit little-endian signed integer
no channel layout.
estimated duration: 8.380000 sec
audio bytes: 134080
audio packets: 67040
audio 67040 valid frames + 0 priming + 0 remainder = 67040
bit rate: 128000 bits per second
packet size upper bound: 2
audio data file offset: 4096
optimized
source bit depth: I16
sound check:
approximate duration in seconds 8.38
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