FFMPEG转换WAV到MP3

下载FFMPEG

https://ffmpeg.zeranoe.com/builds/

Example to encode VBR MP3 audio with ffmpeg using the libmp3lame library:

ffmpeg -i input.wav -codec:a libmp3lame -qscale:a 2 output.mp3

Control quality with -qscale:a (or the alias -q:a). Values are encoder specific, so for libmp3lame the range is 0-9 where a lower value is a higher quality. 0-3 will normally produce transparent results, 4 (default) should be close to perceptual transparency, and 6 produces an "acceptable" quality. The option -qscale:a is mapped to the -V option in the standalone lame command-line interface tool.

LAME Bitrate Overview
lame option	Average kbit/s	Bitrate range kbit/s	ffmpeg option
-b 320	320	320 CBR (non VBR) example	-b:a 320k (NB this is 32KB/s, or its max)
-V 0	245	220-260	-q:a 0 (NB this is VBR from 22 to 26 KB/s)
-V 1	225	190-250	-q:a 1
-V 2	190	170-210	-q:a 2
-V 3	175	150-195	-q:a 3
-V 4	165	140-185	-q:a 4
-V 5	130	120-150	-q:a 5
-V 6	115	100-130	-q:a 6
-V 7	100	80-120	-q:a 7
-V 8	85	70-105	-q:a 8
-V 9	65	45-85	-q:a 9

In our example above, we selected -qscale:a 2, meaning we used LAME's option -V 2, which gives us a VBR MP3 audio stream with an average stereo bitrate of 170-210 kBit/s.