问题描述
我有文件的大批量，我想关于使用债务工具中央结算狮身人面像斯芬克斯4.运行识别功能需要满足以下格式：
I have a big batch of files I'd like to run recognition on using CMU Sphinx 4. Sphinx requires the following format:
- 16千赫
- 16位
- 单
- 小尾数
我的文件是像44100千赫，32位立体声MP3文件。我试着用Tritonus，然后将其更新版本JavaZoom，用code从转换。然而， AudioSystem.getAudioInputStream（文件）引发 UnsupportedAudioFileException ，我一直无法找出原因，所以我提出的。
My files are something like 44100 khz, 32 bit stereo mp3 files. I tried using Tritonus, and then its updated version JavaZoom, to convert using code from bakuzen. However, AudioSystem.getAudioInputStream(File) throws an UnsupportedAudioFileException, and I haven't been able to figure out why, so I have moved on.
现在我想的ffmpeg。命令的ffmpeg -i input.mp3 -ac 1 -ab 16 -ar 16000 output.wav 好像它应该做的伎俩（除小端），但是当我请与Audacity的输出，它仍然标注为32位浮点。我在也使用 -a codeC pcm_s16le ，这从它的名字似乎被输出的16位小端;然而，依然无畏的告诉我，输出 32位浮点。
Now I am trying ffmpeg. The command ffmpeg -i input.mp3 -ac 1 -ab 16 -ar 16000 output.wav seems like it should do the trick (except for little endian), but when I check the output with Audacity, it still labels it as "32-bit float". The command I found on this site also uses -acodec pcm_s16le, which from its name seems to be outputting 16 bit little endian; however, Audacity still tells me the output is 32 bit float.
谁能告诉我如何将音频文件转换成CMU狮身人面像4所要求的格式？
Can anyone tell me how to convert audio files into the format required by CMU Sphinx 4?
推荐答案
你真的尝试从FFmpeg的CMU中狮身人面像4的输出？ 32位浮点可能是在Audacity的默认采样格式（编辑> preferences>质量的）。我猜这将任何导入的文件对这些设置，所以它可能没有报告的实际文件的参数，但也许在Audacity的工作文件。
Did you actually try the output from ffmpeg in CMU Sphinx 4? 32-bit float is probably your default sampling format in Audacity (Edit > Preferences > Quality). I'm guessing it converts any imported file to these settings, so it may not be reporting the parameters of the actual file, but perhaps the working file in Audacity.
删除 16 -AB 。这将指示连接codeR使用16位/ s和ffmpeg的会忽略它pcm_s16le反正。所以，你的命令如下：
Remove -ab 16. This would instruct the encoder to use 16 bits/s and ffmpeg will ignore it for pcm_s16le anyway. So your command will look like:
ffmpeg -i input.mp3 -acodec pcm_s16le -ac 1 -ar 16000 output.wav
要所有的MP3文件转换目录中的在Linux中：
To convert all mp3 files in a directory in Linux:
for f in *.mp3; do ffmpeg -i "$f" -acodec pcm_s16le -ac 1 -ar 16000 "${f%.mp3}.wav"; done
或Windows：
for /r %i in (*) do ffmpeg -i %i -acodec pcm_s16le -ac 1 -ar 16000 %i.wav
您可以看到文件的信息，的ffmpeg ， ffprobe ， mediainfo 其他实用程序中：
You can see file information with file, ffmpeg, ffprobe, mediainfo among other utilities:
$ file hjl0bC.wav
hjl0bC.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 16000 Hz
$ ffmpeg -i hjl0bC.wav
[...]
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 Hz, mono, s16, 256 kb/s
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