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. q:a 0 (NB this is VBR from 220 to 260 KB/s) b:a 320k (NB this is 32KB/s, or its max)
The option -qscale:a is mapped to the -V option in the standalone lame command-line interface tool. 0-3 will normally produce transparent results, 4 (default) should be close to perceptual transparency, and 6 produces an "acceptable" quality. Values are encoder specific, so for libmp3lame the range is 0-9 where a lower value is a higher quality.
See also other codecs you could use, and FFmpeg AAC Encoding Guide if you want AAC instead, and the official documentation.Įxample to encode VBR MP3 audio with ffmpeg using the libmp3lame library:įfmpeg -i input.wav -codec:a libmp3lame -qscale:a 2 output.mp3Ĭontrol quality with -qscale:a (or the alias -q:a). This page describes how to use the external libmp3lame encoding library within ffmpeg to create MP3 audio files ( ffmpeg has no native MP3 encoder).
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