libmp3lame


LAME (Lame Ain't an MP3 Encoder) MP3 encoder wrapper.

Requires the presence of the libmp3lame headers and library during configuration. You need to explicitly configure the build with --enable-libmp3lame.

See for a fixed-point MP3 encoder, although with a lower quality.

The following options are supported by the libmp3lame wrapper. The lame-equivalent of the options are listed in parentheses.

'b (-b)'

Set bitrate expressed in bits/s for CBR or ABR. LAME bitrate is expressed in kilobits/s.

'q (-V)'

Set constant quality setting for VBR. This option is valid only using the ffmpeg command-line tool. For library interface users, use 'global_quality'.

'compression_level (-q)'

Set algorithm quality. Valid arguments are integers in the 0-9 range, with 0 meaning highest quality but slowest, and 9 meaning fastest while producing the worst quality.

'cutoff (--lowpass)'

Set lowpass cutoff frequency. If unspecified, the encoder dynamically adjusts the cutoff.

'reservoir'

Enable use of bit reservoir when set to 1. Default value is 1. LAME has this enabled by default, but can be overridden by use '--nores' option.

'joint_stereo (-m j)'

Enable the encoder to use (on a frame by frame basis) either L/R stereo or mid/side stereo. Default value is 1.

'abr (--abr)'

Enable the encoder to use ABR when set to 1. The lame '--abr' sets the target bitrate, while this options only tells FFmpeg to use ABR still relies on 'b' to set bitrate.