Extract AU Audio from MP4 Video
Convert MP4 to AU in your browser for legacy workstation exchange. The source remains on your device throughout local processing.
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Max 500 MB per file
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Quick use cases
- Separate dialogue or music from a MP4 picture track
- Prepare AU for legacy workstation exchange
- Keep a AU audio-only version for review, transcription, or editing
Workflow
- Choose a MP4 file from your device
- Enter a clear filename for the AU result
- Remove the picture and prepare AU
- Open the downloaded AU in its intended workflow
Processing notes
- Local conversion competes with other open apps for processor time while preparing AU from MP4.
- Duration, resolution, and source bitrate affect how quickly MP4 is processed.
- Keep the source until the AU result passes a full playback check.
Compatibility notes
- AU is appropriate for Unix workstations and older audio software.
- The MP4 source must contain a readable audio stream; a silent container cannot supply one.
- For the next step, account for limited modern consumer support.
Troubleshooting
- No sound found? Play the MP4 source and confirm it contains an audio track.
- Extraction from MP4 slow? Close other demanding apps, then test a short sample before the full file.
- If AU is rejected, compare its codec and stream settings with the destination specification.
MP4 to AU audio FAQ
Why extract AU from MP4?
An audio-only AU copy supports legacy workstation exchange without retaining the MP4 picture.
Can every MP4 file produce AU?
Only when the MP4 source contains a readable audio stream; video-only footage cannot produce useful AU.
What should I check in AU after extracting from MP4?
Listen through the AU result for expected duration, channels, level, and synchronization before delivery.