You’ll find this format most commonly used in podcasts and audiobook files. m4b extension files contain more data within it that allow for audio tracks to be paused and played and resumed from where it was last stopped. It was very common and popular as Apple used this format for all the tracks sold on its App Store.Īnother slight variation of the MP4 file extension includes the. m4a was used strictly to label only audio tracks. It was used as a means to distinguish between video and audio files so. mp4 files theoretically could contain both video and audio within it, it makes it very difficult to determine which files are only video, or only audio, or both. The default file extension for MP4 is ".mp4". Since the format and contents of the file varies, so does the file extensions: MP4 doesn’t have a specific file extension.
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