AAC与MPEG4封装AAC媒体帧的方式存在相当的区别，尽管记录的信息相似。
在AAC文件中，帧播放的配置信息存储于帧首部（7-8个字节，ID=0时为7，否则为8）。而在MPEG4中，由于他采用box的一对象的方式封装媒体，故其AAC音频播放信息也被封装于box中。仅使用2个字节。AAC帧首部参看过去的文章，AAC decoder config layout如下：
| 名称 |
bits |
信息 |
备注 |
| Audio Profile |
5 |
0 main
1 LC
2 SSR
3 reserved
|
|
| Sampling FrequencyIndex |
4 |
|
index见SF表 |
| ChannelConfig |
4 |
|
声道个数 |
| FrameLengthFlag |
1 |
1024 or 960 |
|
| DependsOnCoreCoder |
1 |
0 |
|
| ExtensionFlag |
1 |
0 |
|
由于AAC文件与MPEG4文件的实际应用存在区别，故除了基本信息外，其他记录的信息存在区别。
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