audio-convert

name	audio-convert
description	Convert audio files between formats (MP3, WAV, OGG, FLAC, M4A, AAC, OPUS) and adjust properties such as bit rate, sample rate, and channel count using ffmpeg. Use this skill whenever the user wants to change an audio file's format, compress it, or re-encode it.
homepage	https://ffmpeg.org/ffmpeg.html
metadata	{"nanobot":{"emoji":"🎵","os":["linux","darwin"],"requires":{"bins":"[Truncated]"},"install":["[Truncated]","[Truncated]"]}}

Audio Convert

Convert audio files between formats and adjust encoding parameters with ffmpeg.

Supported Formats

Input and output: MP3, WAV, OGG, FLAC, M4A (AAC), AAC, OPUS, WMA, AIFF, and all other formats supported by ffmpeg.

Basic Conversion

WAV → MP3

ffmpeg -i input.wav -acodec libmp3lame -ab 192k output.mp3

MP3 → WAV

ffmpeg -i input.mp3 output.wav

Any format → FLAC (lossless)

ffmpeg -i input.mp3 output.flac

Any format → OGG Vorbis

ffmpeg -i input.mp3 -acodec libvorbis -q:a 5 output.ogg

Any format → OPUS (high quality, low bitrate)

ffmpeg -i input.wav -acodec libopus -b:a 96k output.opus

Any format → M4A (AAC)

ffmpeg -i input.mp3 -acodec aac -ab 192k output.m4a

Adjust Audio Properties

Change sample rate (e.g., to 16 kHz for speech recognition)

ffmpeg -i input.wav -ar 16000 output.wav

Convert stereo to mono

ffmpeg -i input.wav -ac 1 output.wav

Change bit rate

ffmpeg -i input.wav -ab 128k output.mp3

Combine sample rate + channels + format in one command

ffmpeg -i input.mp3 -ar 16000 -ac 1 -acodec pcm_s16le output.wav

Batch Conversion

Convert all MP3 files in a directory to WAV

for f in *.mp3; do ffmpeg -i "$f" "${f%.mp3}.wav"; done

Check File Info Before Converting

ffprobe -v quiet -show_streams -select_streams a:0 input.mp3

Common Codec Reference

Format	Codec flag	Notes
MP3	libmp3lame	Requires lame in ffmpeg build
AAC/M4A	aac	Built-in encoder
OGG	libvorbis	Open, patent-free
OPUS	libopus	Best quality/size ratio
FLAC	flac	Lossless, larger files
WAV	pcm_s16le	Uncompressed PCM

Notes

• ffmpeg overwrites output files by default; add -n to skip existing files or -y to always overwrite.
• To strip metadata from the output, add -map_metadata -1.
• On resource-constrained PicoClaw hardware, prefer lightweight formats (WAV, MP3) over computationally expensive ones (FLAC encoding is fast; OPUS encoding may be slow on very low-end boards).