视频转换，
3GP to MPEG,
3GP to AVI,
3GP to VOB,
3GP to MPEG4,
3GP to WMV,etc, and extract audio from 3GP video file and convert to MP3, WAV, AC3, WMA, m4a, ogg, aac to audio-only 3GP file.
链接
视频转换，
3GP to MPEG,
3GP to AVI,
3GP to VOB,
3GP to MPEG4,
3GP to WMV,etc, and extract audio from 3GP video file and convert to MP3, WAV, AC3, WMA, m4a, ogg, aac to audio-only 3GP file.
链接
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