什么是AAC？
AAC（先进音频编码）是一种有损音频压缩格式，旨在作为MP3的继任者，在相同或更小的文件大小下提供更好的音质，并被Apple、YouTube和大多数流媒体服务作为标准音频格式使用。
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What is it?
AAC（先进音频编码）是一种有损音频压缩格式，旨在作为MP3的继任者，在相同或更小的文件大小下提供更好的音质，并被Apple、YouTube和大多数流媒体服务作为标准音频格式使用。
理解AAC有助于您为特定需求和工作流程选择合适的格式。
Technical Specifications
Pros & Cons
Advantages
AAC achieves equivalent or better audio quality to MP3 at lower bitrates, resulting in smaller files.
The default audio format for YouTube, iTunes, Apple Music, and most streaming platforms.
Supported natively by all Apple devices, Android, most car audio systems, and game consoles.
Supports up to 48 audio channels for advanced surround sound applications.
Disadvantages
Like MP3, AAC permanently removes audio data that cannot be recovered - not suitable for archiving.
Apple's HE-AAC and AAC-LC have different compatibility profiles - not all decoders handle all variants.
Some older or specialized audio devices only support MP3, not AAC.
AAC is covered by patents requiring licensing fees for encoders, though decoders are generally free.
When to Use It
以下是AAC是正确选择的最常见场景：
Music Streaming
Apple Music, YouTube, and most streaming platforms deliver audio in AAC format.
iTunes and Apple Devices
The native audio format for all Apple devices, purchased music from iTunes Store, and podcasts.
Video Audio Tracks
AAC is the standard audio codec in MP4 video files for movies, TV shows, and online video.
Podcast Distribution
Most podcasts are distributed as AAC or MP3 for wide device compatibility.
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Is AAC better than MP3?
Yes, at equivalent bitrates AAC generally sounds better due to improved compression algorithms. 128kbps AAC sounds comparable to 192kbps MP3.
What is the difference between AAC and M4A?
M4A is the file extension for AAC audio in an MPEG-4 container. They contain the same audio; M4A is just the iTunes-named version.
What bitrate should I use for AAC?
128kbps for casual listening, 192kbps for good quality, 256kbps for excellent quality that most people cannot distinguish from lossless.
Can Android play AAC files?
Yes, Android natively supports AAC playback. All major music apps on Android handle AAC files and streams.
Is Apple Music AAC or lossless?
Apple Music now offers both: standard AAC (256kbps) and Apple Lossless (ALAC) for subscribers. Most content is available in both quality levels.