The format specifies a multimedia container file that contains one or more tracks, each of which stores a particular type of data: audio, video, or text (e.g., for subtitles). Because both the QuickTime and MP4 container formats can use the same MPEG-4 formats, they are mostly interchangeable in a QuickTime-only environment. The International Organization for Standardization approved the QuickTime file format as the basis of the MPEG-4 file format. ![]() ![]() QuickTime File Format (QTFF) is a computer file format used natively by the QuickTime framework. The Moving Picture Experts Group designed standards for both files under the MPG category. MPEG-2 is not the most efficient at file compression, but it is commonly used due to compatibility with various programs. Windows, Mac, and many mobile devices can run MPEG-1 and MPEG-2 files. Both MPG files serve as container files for audio and video data to ensure the two portions remain in sync. ![]() MPG files are also listed as MPEG-1 and MPEG-2 files. This file type offers small file sizes with high quality. MPG allows lossy compression with little audio and video quality loss for easy downloading due to the less space needed for storage.
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