請問有甚麼萬能轉檔器可以轉音訊及視訊格式？

Mobile phone 3GP converter Convert any input video format to 3GP. Convert a 3GP file to any other video format.
MP4 converter Convert any input video format to MP4. Convert an MP4 file to any other video format.
The rendered MP4 files are created using a wide variety of codecs H.264/MPEG-4/DivX/XviD/H.263... together
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