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NOTE: This is a collection of information and links collected over the years that might provide useful information. A Safer Company LLC does not guarantee, endorse or approve any of these links or their scripts. Use these links to other websites at your own risk.

Common Audio Formats

Note: Sound files are handled very differently and inconsistently by different browsers. Adding the sound file to a SWF file and then embed the SWF file can improve consistency.

• .midi or .mid (Musical Instrument Digital Interface)
  • a way of representing music as instructions describing how to produce notes, instead of as a record of the actual note.
  • an industry-standard protocol that enables electronic musical instruments (synthesizers, drum machines), computers and other electronic equipment (MIDI controllers, sound cards, samplers) to communicate and synchronize with each other.
  • best for instrumental music; speech does not work as well.
  • supported by many browsers
  • don’t require a plug-in.
  • Although their sound quality is very good, it can vary depending on a visitor’s sound card. A small MIDI file can provide a long sound clip. MIDI files cannot be recorded and must be synthesized on a computer with special hardware and software.
  • usually a smaller file size
• .wav (Waveform Extension) for PC Windows
  • good sound quality
  • supported by many browsers
  • don’t require a plug-in.
  • can record your own WAV files from a CD, tape, microphone, etc
  • large file size severely limits the length of sound clips that you can use on your web pages.
• .aif (Audio Interchange File Format, or AIFF) for MacOS
  • good sound quality
  • can be played by most browsers
  • doesn’t require a plug‑in
  • can record AIFF files from a CD, tape, microphone, and etc.
  • the large file size severely limits the length of sound clips that you can use on your web pages.
• .mp3 (Motion Picture Experts Group Audio, or MPEG-Audio Layer-3)
  • compressed format that makes sound files substantially smaller.
  • sound quality is very good
  • if an mp3 file is recorded and compressed properly, its quality can rival that of a CD.
  • allows “streaming” the file so that a visitor doesn’t have to wait for the entire file to download before hearing it.
  • file size is larger than a Real Audio file, so an entire song could still take quite a while to download over a typical dial‑up (telephone line) modem connection.
  • Requires plug-in, such as QuickTime, Windows Media Player or RealPlayer.
• .ra, .ram, .rpm, or Real Audio
  • high degree of compression, with smaller file sizes than mp3.
  • Entire song files can be downloaded in a reasonable amount of time. Because the files can be “streamed” from a normal web server, visitors can begin listening to the sound before the file has completely downloaded. Visitors must download and install the RealPlayer helper application or plug‑in to play these files.
• .qt, .qtm, QuickTime (.mov)
  • both an audio and video format developed by Apple Computer.
  • QuickTime is included with Apple Macintosh operating systems, and is used by most Macintosh applications that use audio, video, or animation. PCs can also play files in QuickTime format, but require a special QuickTime driver. QuickTime supports most encoding formats, including Cinepak, JPEG, and MPEG.

Note:There are many different audio and video file formats available for use on the web.

• Audio Only (.aac)
• FLV | F4v (.f4v)
• H.264 (.mp4)
• H.264 Blu-ray (.m4v)
• MPEG4 (.mp4)
• MPEG1 (.mpg)
• MPEG2 (.mpg)
• MPEG2-DVD (.mpg)
• MPEG2 Blu-ray (.m2v)
• Windows Media (.wmv)
• Windows Media (.wma)
• Microsoft AVI (.avi)

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Page last updated: May 31, 2012 14:37 PM