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What is AU?

Sun AU is the native audio format for Sun Microsystems workstations, using simple mu-law encoding or uncompressed PCM.

What is MKA?

MKA (audio/x-matroska) uses lossy compression optimized for multitrack audio, audio streaming, chapter support. Matroska Audio, flexible container for audio streams

When Should You Use AU vs MKA?

Use AU When...

AU shines in legacy unix audio, sun workstation sound scenarios. The pixel-perfect output meets the demands of professional production environments.

Use MKA When...

Choose MKA for multitrack audio, audio streaming, chapter support. It balances quality and file size better than most alternatives in its class.

AU vs MKA: Key Differences

  • •AU and MKA diverge on compression: lossless compression for the source, lossy compression for the target.
  • •Converting from AU to MKA changes compression type: lossy source becomes smaller but with some quality tradeoff.
  • •How transparency is handled: MKA does not support alpha channels — transparent areas in the source will become opaque.
  • •MKA files tend to be differently sized than AU
  • •Primary audience: AU is built for legacy unix audio, sun workstation sound scenarios, while MKA focuses on multitrack audio, audio streaming, chapter support — pick the format that matches your output requirement.

Advantages of AU

  • ✓AU compresses data using lossless methods, keeping file sizes manageable for Legacy Unix audio, Sun workstation sound.
  • ✓Industry-wide support means AU files open anywhere — from legacy systems to the latest devices.
  • ✓Lossless quality makes AU the gold standard for archival and master copies.
  • ✓From professional software to open-source alternatives, AU works out of the box.

Advantages of MKA

  • ✓MKA applies lossy compression specifically calibrated for Multitrack audio, audio streaming, chapter support.
  • ✓MKA enjoys broad native support across operating systems, browsers, and creative tools alike.
  • ✓MKA delivers impressive compression ratios, shrinking files dramatically while keeping visual quality high.
  • ✓You will find MKA support built into virtually every tool that handles Multitrack audio, audio streaming, chapter support — no plugins or converters needed.

Common Use Cases for AU to MKA Conversion

  • Language learning
  • Professional broadcasting
  • Video game audio assets
  • Film soundtracks
  • Radio commercials
  • Guided meditation recordings

Industry Applications

Voice-overAudio ArchivingGame AudioFilm Post-productionAudiobook PublishingMusic Streaming

Best Practices for AU to MKA Conversion

  • →For AU to MKA: match the sample rate and bit depth to your delivery platform — 44.1 kHz / 16-bit is the standard for music
  • →Apply loudness normalization (LUFS) before conversion to ensure consistent volume across your audio library
  • →MKA prioritizes quality — ensure your storage can accommodate the resulting file sizes
  • →Check that metadata tags (artist, album, track number) survive the conversion
  • →Convert a short segment first to verify quality at your chosen bitrate
  • →Keep a lossless master copy in case you need to re-encode for a different platform

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

Learn more about AU and MKA formats in our detailed guide.

Troubleshooting AU to MKA Conversion

  • !MKA audio quality degraded vs AU → use a higher bitrate (at least 256 kbps for music)
  • !MKA file won't play on your device → check format compatibility with your player or platform
  • !Metadata (artist, album, title) lost after AU to MKA conversion → some formats like MKA may not support ID3 tags
  • !Volume changed after converting AU to MKA → normalize audio levels before conversion for consistent playback

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About AU and MKA

AU

AU (AU audio) - Sun AU, legacy Unix audio format for Sun workstations. Best for legacy unix audio, sun workstation sound.

MKA

MKA (MKA) - Matroska Audio, flexible container for audio streams. Ideal for multitrack audio, audio streaming, chapter support.

Format Comparison

CompressionLossless → Lossy
TransparencyN/A
Use CaseConvert from legacy unix audio, sun workstation sound to multitrack audio, audio streaming, chapter support
File Size~Standard file sizes after conversion

FAQs

Is converting AU to MKA free?

Yes, GoConvertFile offers free conversion of AU to MKA for files up to 100MB. No registration required.

How long does it take to convert AU to MKA?

Most AU to MKA conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.

What is MKA best used for?

MKA is ideal for multitrack audio, audio streaming, chapter support. Matroska Audio, flexible container for audio streams

Does converting AU to MKA lose quality?

Yes, converting AU to MKA uses lossy compression, which reduces file size by discarding some visual data. Set quality to 85-95% for a good balance of quality and file size.

What file size should I expect after converting AU to MKA?

MKA files are typically 50-80% smaller than AU files because MKA uses efficient lossy compression. The exact reduction depends on quality settings.

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