MMegaConvert

Convert AC3 to AU

Free online AC3 to AU converter. No signup required.

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Max file size: 100 MB

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How to Convert AC3 to AU

Follow these simple steps to convert your file in seconds.

  1. 1

    Upload your .ac3 file

    Drag and drop your .ac3 file into the upload area, or click "Browse" to select it from your device. Your file is uploaded securely and processed on our servers.

  2. 2

    Click "Convert to AU"

    Once your file is uploaded, press the convert button to start the AC3 to AU conversion process.

  3. 3

    Wait for the conversion to complete

    The conversion usually takes just a few seconds. You can see the progress in real time while your file is being processed.

  4. 4

    Download your converted .au file

    When the conversion is finished, click the download button to save your new .au file. The file is ready to use immediately.

Understanding AC3 and AU Formats

Learn about the source and target file formats to understand what happens during conversion.

Source Format

Dolby Digital Audio

audio/ac3

AC3 (Audio Codec 3), also known as Dolby Digital, is a lossy multi-channel audio compression format developed by Dolby Laboratories. It supports up to 5.1 surround sound channels at bitrates up to 640 kbps and is the standard audio format for DVDs, Blu-ray discs, and digital television broadcasting. AC3 uses psychoacoustic modeling to achieve efficient compression of surround sound content.

Advantages

  • Supports multi-channel surround sound up to 5.1 channels
  • Industry standard for DVD, Blu-ray, and broadcast television audio
  • Good compression efficiency for multi-channel content

Limitations

  • Lossy compression that cannot match lossless quality
  • Maximum bitrate of 640 kbps limits quality for high-fidelity applications
  • Proprietary Dolby technology with licensing requirements

Common Uses

  • DVD and Blu-ray disc surround sound audio tracks
  • Digital television and cable broadcast audio
  • Home theater and surround sound content delivery

Target Format

Sun AU Audio

audio/basic

AU is an audio file format introduced by Sun Microsystems and commonly associated with Unix and NeXT systems. It supports various encodings including uncompressed PCM, mu-law, and A-law compression, with a simple header structure. AU was one of the earliest audio formats supported on the web and remains used in Unix-based audio programming.

Advantages

  • Simple, well-documented format with a minimal header
  • Native support in Unix, Solaris, and Java audio APIs
  • Supports multiple encoding types including mu-law for telephony

Limitations

  • Largely obsolete for general-purpose audio use
  • Limited metadata support and no modern compression options
  • Poor support in consumer audio software and devices

Common Uses

  • Unix and Solaris system audio and sound effects
  • Java application audio playback (javax.sound)
  • Legacy telephony and voice processing systems

Frequently Asked Questions

Common questions about converting AC3 to AU.

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