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Is MPEG4 same as MP4?
Is MPEG4 same as MP4?
M4P are similar to .MPEG4 files in that they can contain audio and video, or can simply be solely audio files.

To some extent MPEG4 is same as MP4 files. MPEG4 files can play audio/video media, or simply audio. They are low in file size but also relatively low in quality. They also have lossy compression, meaning their quality will degrade after being edited numerous times. M4P are similar to .MPEG4 files in that they can contain audio and video, or can simply be solely audio files. They are generally higher in quality than .MPEG4 files, but tend to be larger in file size.