What format is m4a?

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M4A is the file extension of the MPEG-4 audio standard. The most commonly used .m4a files are in the AAC format, but other formats such as Apple Lossless and even mp3 can also be placed in the .m4a container. You can safely change the extension of an audio-only .mp4 file to .m4a so that it plays in your favorite player, and vice versa. The php Chinese website has also prepared M4A related tutorials and articles for everyone. You are welcome to read them.