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What's in the name of? .Aac V.m4a? aac-> Powered by quicktime website. m4a-> works on iPad

What is the difference between the .aac file and the .m4a file? If I just change the file extension of the recorded audio file and then convert it to "AAC" between .aac / .m4a, it dramatically affects how the file is processed.

AAC: Play in a web browser instead of an iPad M4A: Play on an iPad instead of a web browser.

Is there a real conversion between the two formats?

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Sometimes the file extension refers to the wrapper of the file. A codec like aac can be wrapped in more than one file format like 3gp, mp4, or adts.



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I have not tried directly changing the .aac and .m4a file extensions from one to the other, but from past experience I have had encounters with audio encoded via AAC which, when played as an AAC file, does not display the total track time in my media player. When wrapped in an m4a file using mp4 multiplayer and played as such, then the total track time will be displayed. So it has an effect.



And as mark.chackerian pointed out, the file extension can refer to the shell format, not just the codec used to encode the audio. AAC is the codec, MP4 is the wrapper format, and .m4a is the extension for MP4 files that only support audio (I believe).

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.m4a should work on both - have you checked that your web server is configured to send the correct MIME type audio/mp4

for .m4a?

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