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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 MPC?

Musepack (MPC) is an efficient lossy audio codec that offers excellent quality at medium bitrates, popular in the early 2000s.

When Should You Use AU vs MPC?

Use AU When...

For legacy unix audio, sun workstation sound, nothing beats AU. It sets the standard for quality, trusted by professionals who cannot afford compromises.

Use MPC When...

MPC is built for music archival with good quality-to-size ratio. Think of it as the practical workhorse — small files, big compatibility, no fuss.

AU vs MPC: Key Differences

  • •AU uses lossless compression while MPC uses lossy compression — this is the fundamental technical difference between the two formats.
  • •Moving from AU (lossy) to MPC (lossy) means the output file will be significantly smaller — but at the cost of some visual fidelity.
  • •Transparency: N/A — converting from AU will merge transparency into a solid background
  • •File sizes: AU files typically range Small to medium, similar to WAV and MPC files Slightly smaller than MP3 at equivalent quality.
  • •AU is optimized for legacy unix audio, sun workstation sound while MPC is designed for music archival with good quality-to-size ratio — choose based on your specific workflow needs

Advantages of AU

  • ✓At its core, AU relies on lossless encoding — a design choice that makes it perfect for Legacy Unix audio, Sun workstation sound.
  • ✓You won't run into compatibility issues with AU — it's a universal standard across platforms.
  • ✓File size management with AU: larger files guaranteed to match the original exactly.
  • ✓Every major application in the Legacy Unix audio, Sun workstation sound space supports AU natively.

Advantages of MPC

  • ✓At its core, MPC relies on lossy encoding — a design choice that makes it perfect for Music archival with good quality-to-size ratio.
  • ✓You won't run into compatibility issues with MPC — it's a universal standard across platforms.
  • ✓File size management with MPC: aggressive compression with minimal visible quality loss.
  • ✓Every major application in the Music archival with good quality-to-size ratio space supports MPC natively.

Common Use Cases for AU to MPC Conversion

  • Film soundtracks
  • Radio commercials
  • Guided meditation recordings
  • Audiovisual installation
  • Music education
  • Conference call recordings

Industry Applications

Film Post-productionAudiobook PublishingMusic StreamingLive SoundForensic AudioMedical Transcription

Best Practices for AU to MPC Conversion

  • →Converting AU to MPC: MPC uses lossy compression — choose a higher bitrate (320 kbps) for near-CD quality
  • →Normalize audio levels before conversion for consistent playback volume
  • →MPC excels in professional audio workflows
  • →Always keep a backup of your original files before converting
  • →Choose the appropriate quality settings for your specific use case

Related Article

Video Compression Guide: Reduce File Size Without Losing Quality

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

Troubleshooting AU to MPC Conversion

  • !Clicks or pops in the converted MPC → sample rate conversion can introduce artifacts; use a clean multiple of the source rate
  • !MPC file has silence at the beginning or end → trim the source AU file before converting to avoid unnecessary padding
  • !Stereo image collapsed after converting AU to MPC → verify that the converter preserves channel mapping for multichannel audio
  • !The converted MPC clips or distorts at peaks → reduce the gain or apply a limiter before conversion to prevent hard clipping

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About AU and MPC

AU

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

MPC

MPC (Musepack MPC) - Musepack, efficient lossy audio compression. Ideal for music archival with good quality-to-size ratio.

Format Comparison

CompressionLossless → Lossy
TransparencyN/A
Use CaseConvert from legacy unix audio, sun workstation sound to music archival with good quality-to-size ratio
File Size~Slightly smaller than MP3 at equivalent quality after conversion

FAQs

Is converting AU to MPC free?

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

How long does it take to convert AU to MPC?

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

What is MPC best used for?

MPC is ideal for music archival with good quality-to-size ratio. Musepack, efficient lossy audio compression

Does converting AU to MPC lose quality?

Yes, converting AU to MPC 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 MPC?

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

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