compression - 用 MP3 压缩语音

Question

我正在寻找压缩一些 MP3 格式的讲座。目前，它们每个大约 75MB，我希望对它们进行大量压缩。谁能建议一些好的 LAME 编码选项以获得良好的质量和较小的文件大小？

我认为这些文件是立体声的，但显然如果需要的话，它们可以转为单声道。有没有有效压缩 MP3 语音的指南？

Answer 1

http://macintoshhowto.com/audio/how-to-compress-speech.html有这个:

1. SMALLEST FILE SIZE ACCEPTABLE QUALITY. For very small file size (4MBfor 20 minutes) and acceptablequality, use the LAME encoder (the theseparate article on Itunes songs tofind out about the LAME encoder) withthe following arguments in the‘Encoding options’ Box:

   -V 9 --vbr-new -mm -h -q 0
   

2. An even better option than above but slightly more complicated is:Firstly convert the file to 22khzsample rate and mono, (eg in Audacity)then use the following LAME settings:

   -V 8 --vbr-new -h -q 0
   

3. BETTER QUALITY AND ACCEPTABLE FILE SIZE. For about twice the size files(8MB for 20 minutes of speech) butvery very good quality try this inLAME encoder:

   --preset voice
   

OR

-V 8 --vbr-new -h -q 0