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Convert m4a to mp3 on OS X command line using ffmpeg
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| brew update | |
| brew link yasm | |
| brew link x264 | |
| brew link lame | |
| brew link xvid | |
| brew install ffmpeg | |
| ffmpeg wiki: | |
| https://trac.ffmpeg.org/wiki/Encode/MP3 | |
| 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 | |
| ffmpeg -i in.m4a -codec:a libmp3lame -qscale:a 1 out.mp3 |
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