| 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).
