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River past MPEG-4 Booster Pack is an add-on pack, which adds the ability to output MPEG-4 video and audio files to certain River Past and HeavyMath video software.
MPEG-4 is commonly used by streaming, especially on cell phones, digital cameras, and other portable devices. Its high quality and small file size is ideal for this purpose. MPEG-4 audio (M4A) is used iTune and iPod for the music encoding, offering better quality than MP3 at the same bitrate.