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Mp3

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Reference:trac.ffmpeg.org

Codecs ​

Quality from high to low:

libopus > libvorbis >= libfdk_aac > libmp3lame >= eac3/ac3 > aac > libtwolame > vorbis > mp2 > wmav2/wmav1

libmp3lame ​

LAME MP3 encoder wrapper.

OptionDescription
-qscale:aAudio quality. Range is 0-9 (default 4, higher is worst).
shell
ffmpeg -i input.wav -acodec libmp3lame -qscale:a 3 output.mp3

Generate empty audio ​

To be able to use anullsrc as input we need to force lavfi (libavfilter virtual input device) format, or else ffmpeg assumes anullsrc is a filename.

The duration is set with -t in seconds.

shell
ffmpeg -f lavfi -i 'anullsrc=channel_layout=mono:sample_rate=24000' -codec:a libmp3lame -t 0.3 silence300ms.mp3