Dolby Digital 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 of Dolby Digital Audio
What the AC3 format does well, and why you might choose it.
- 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 of Dolby Digital Audio
What the AC3format doesn't do well, and when to choose another format.
- Lossy compression that cannot match lossless quality
- Maximum bitrate of 640 kbps limits quality for high-fidelity applications
- Proprietary Dolby technology with licensing requirements
What AC3 files are used for
- DVD and Blu-ray disc surround sound audio tracks
- Digital television and cable broadcast audio
- Home theater and surround sound content delivery
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Frequently asked questions about AC3
What is a .AC3 file?
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.
What is the MIME type of AC3?
The official MIME type for AC3 files is audio/ac3. This is the value web servers and applications use to identify the format when transferring files.
What category does AC3 belong to?
AC3 is a Audio Converter format. Files in this category share common conversion paths and use cases.
How do I open a .AC3 file?
AC3 files are typically opened by software that natively supports the Dolby Digital Audioformat. If you don't have a compatible application, the most reliable approach is to convert the file to a more universal format using the converters listed above. Most Dolby Digital Audio files convert to widely-supported alternatives in seconds.
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