3GPP Converter
DevConverter converts your video files online. Amongst many others, we support MP4, WEBM and AVI. You can use the options to control video resolution, quality and file size.
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3GPP
3GP is an audio and video container format that is generally used in 3G cell phones. But it can also work in 2G and 4G cell phones. This MP4 based container broadcasts multimedia files between cell phones over internet.