What Sort of Audio Files Can I Watermark?

File Contents

Certain types of audio content will ‘take’ a watermark better than others. The basic rule is that you want almost continual noise, with few silences as possible.

Examples of audio that works well with watermarking:

  • TV and radio ads with speech and/or music
  • Infomercials
  • Pop and rock music

Examples of audio to avoid:

  • Commentary during a golf broadcast
  • Solo instrumental music
  • Recordings of sparse conversation
  • Audio files that do not meet the technical specs below

File Formats

The audio file formats that work with watermarking are:

  • *.wav (preferred)
  • *.mp3

File Duration

  • Minimum length: 10 seconds
  • Maximum length: 10 minutes

Technical Guidelines

  • File extension must be in lowercase.
  • Sample rate: 44.1kHz or 48kHz
  • Bits per sample: 16 or 24
  • Bit rate: 128kbps or higher
  • File size: Under 150MB

Tip: How To Check the ‘Sample Rate’ of a File

Many audio players and most audio editors can show you advanced details of a file. For example, you can use the free Quicktime player as follows:

  • Load the audio file
  • Choose “Show Movie Inspector” from the Window menu.
  • The Format listing will display the sampling rate, bit rate and other technical information.