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Audio Formula

Audio Formulas allow you to create reusable presets for converting, compressing, and processing audio files. Whether you need standard MP3s for web playback, broadcast-ready volume levels, or pristine lossless archives, formulas ensure your audio exports are consistent every time.

General Settings​

  • Name: A memorable title for your preset (e.g., "Podcast Master", "Web Audio - MP3").
  • Description: An optional breakdown of what this formula is used for. This is helpful if you are sharing formulas with a team.

Encoding Settings​

Codec​

Determines the audio format for your output file. Make sure to choose a format supported by the devices or platforms you plan to use.

  • MP3: The most universally supported lossy audio format. Best for general use and maximum compatibility.
  • AAC: Advanced Audio Coding. Offers better sound quality than MP3 at the same file size. Standard for Apple devices and YouTube.
  • Opus: A modern, highly efficient codec ideal for speech, podcasts, and web streaming. Delivers excellent quality at lower bitrates.
  • FLAC: Free Lossless Audio Codec. Compresses the audio file without losing any original sound data. Perfect for archiving and audiophile playback.

Bitrate​

Controls how much detail is kept in the sound, dictating the trade-off between audio quality and file size.

  • Slider Range: Up to 320 kbps.
  • Recommendation: 128 kbps to 192 kbps is typically transparent for spoken word, while 256 kbps to 320 kbps is recommended for high-fidelity music.

Note on Lossless Audio: If you select FLAC as your codec, the Bitrate slider will be hidden. FLAC is a lossless format, meaning its bitrate dynamically adjusts to the complexity of the sound to preserve 100% of the original quality.

Sample Rate​

Sets the audio frequency capture rate. This dictates the maximum audio frequencies your file can reproduce.

  • Same as Source (Recommended): Reads the sample rate from your original input file and preserves it, preventing any unnecessary resampling.
  • 44.1 kHz: The industry standard for music and audio CDs.
  • 48 kHz: The industry standard for video production and film.
  • 88.2 kHz – 192 kHz: High-resolution and ultra high-resolution sample rates, typically only used in professional studio environments or for audiophile mastering.

Processing​

Normalize​

Audio normalization automatically adjusts your file's volume using FFmpeg's loudnorm filter to meet industry-standard Integrated Loudness (LUFS) targets.

  • Off: Leaves the original audio volume completely untouched.
  • Music (-14 LUFS): Sets volume to the standard streaming target (Spotify, YouTube, Apple Music) while preserving natural musical dynamics.
  • Broadcast (-23 LUFS): Meets strict TV and radio broadcast specifications (EBU R128) to prevent clipping and overly aggressive volume output.
  • Voice (-16 LUFS): Tailored for podcasts and spoken word. Compresses dynamic range (LRA 6) to keep speech clear and consistent over background noise.

Common Formula Examples​

Use CaseCodecBitrateSample RateNormalize
Podcast ExportAAC128 kbpsSame as SourceVoice
Music StreamingMP3320 kbps44.1 kHzMusic
Video ProductionAAC320 kbps48 kHzBroadcast
Studio ArchiveFLACN/ASame as SourceOff