名字里有什么? .aac V .m4a? aac-> 适用于 Quicktime 网站。 m4a-> 适用于 iPad
.aac 文件和 .m4a 文件有什么区别?如果我只是更改录制的音频文件的文件扩展名,然后将其转换为 .aac/.m4a 之间的“AAC”,则会极大地影响文件的处理方式。
AAC:在网络浏览器中播放,而不是在 iPad 上播放 M4A:在 iPad 上播放,而不是在网络浏览器上播放。
两种格式之间是否存在真正的转换?
What is the difference between an .aac file and an .m4a file? If I just change the file extension of an audio file recorded and then converted into "AAC" between .aac/.m4a it drastically affects how the file is treated.
AAC: Plays in a web browser, not on the iPad
M4A: Plays on the iPad, not on a web browser.
Is there a real conversion between the two formats?
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有时,文件扩展名指的是文件的包装器。像 aac 这样的编解码器可以封装为多种文件格式,例如 3gp、mp4 或 adts。
Sometimes the file extension refers to the wrapper of the file. A codec like aac can be wrapped in more than one file format, for example 3gp, mp4, or adts.
我没有尝试直接将 .aac 和 .m4a 文件的扩展名从一个更改为另一个,但根据过去的经验,我遇到过通过 AAC 编码的音频,当作为 AAC 文件播放时,不会显示我的媒体播放器中曲目的总时间。当使用 mp4 复用器封装在 m4a 文件中并按此方式播放时,将显示总曲目时间。所以它确实有效果。
正如 mark.chackerian 所说,文件扩展名可以指包装格式,而不仅仅是用于编码音频的编解码器。 AAC 是编解码器,MP4 是包装格式,.m4a 是纯音频 MP4 文件的扩展名(我相信)。
I haven't tried directly changing the extensions of .aac and .m4a files from one to the other, but from past experience, I've had encounters with audio encoded via AAC that, when played as an AAC file, would not display the total time of the track in my media player. When wrapped in an m4a file using an mp4 muxer, and played as such, the total track time would then be displayed. So it does have an effect.
And as mark.chackerian said, the file extension can refer to a wrapper format and not just the codec used to encode the audio. AAC is the codec, MP4 is the wrapper format, and .m4a is the extension for audio-only MP4 files (I believe).
.m4a 应该在两者上工作 - 您是否检查过您的网络服务器是否已配置为发送 .m4a 的正确 MIME 类型
audio/mp4
?.m4a ought to work on both -- have you checked that your web server is configured to send the correct MIME type
audio/mp4
for .m4a?