m4a extension to store audio files, so there's not as much confusion. Users may suffer confusion when there’s failure to playback when they thought their apps supported the MP4 format. This makes it difficult to determine if the MPEG-4 file streams are using file names that use just the extension or something else. There may be video, subtitle streams or audio present. We know that MPEG-4 Part 14 is one of the container formats. If you want to make iPhone ringtone from an other file format, you have to first convert the file to M4R.MP4 Versus and. The iPhone ringtones also have a different sound spectrum that other ringtones do.
They have M4R file name extensions with data encoding in the MPEG-4 codec while other ringtone files are usually in MP3 file container.
IPhone's ringtones are M4R files which are different from other ringtones.
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