3X 3GP Video Converter can also convert mpg, mpeg1, mpeg2, mpeg4, wmv, mp4, 3gp, mov, rm, dv, yuv, h264 to 3GPP file, convert 3GP to MPEG, AVI, VOB, MPEG4, WMV,etc, extract audio from 3GPP video file and convert to MP3, WAV, AC3, WMA, m4a, ogg, aac to audio-only 3GP file 
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