yo te recomiendo el Total Video Converter v3.50 que los convierte de cualqueir extensión a otra que desees.

Total Video Converter v3.50

.M. Total Video Converter is a piece of extremely powerful and full-featured converter software that supports almost all video and audio formats. The software is designed to convert video for your mobile video player as 3gp, mp4, PSP, PS3, iPod, iPhone etc and also VCD or DVD player, XBOX360.

Total Video Converter – очень мощная программа, которая позволяет конвертировать любые видеофайлы в форматы 3gp (формат мобильных телефонов и наладонников), mp4, psp, iPod, swf, flv, DVD, VCD. Total Video Converter поддерживает чтение и проигрывание большого количества видео и аудио форматов (3gp, mp4, psp, iPod, swf, flv, DVD, VCD, mp3, ac3, ogg, wav, aac...), а также конвертирует их в популярные video/audio форматы и форматы мобильных телефонов и наладонников. Присутствует возможность извлечения аудио из видеотреков и сохранение в mp3, ac3, ogg, wav, aac.

Main Features of Total Video Converter:

* Convert all kinds of videos to mobile videos or audios (mp4, 3gp, xvid, divx mpeg4 avi, amr audio) which are used by cell-phone, PDA, PSP, iPod, iPhone, Xbox360, PS3 etc.;
* Photos slide show combines multi-photos and musics with more than 300 photos fantasy transition effect;
* High compatibility and high efficiency for Importing RMVB or RM video/audio;
* Convert various videos to MPEG videos compatible with standard DVD/SVCD/VCD;
* Burn the converted videos to DVD/SVCD/VCD;
* Rip DVD to popular videos of all sorts;
* Extract audio from various of videos and convert which to all kinds of audios (mp3, ac3, ogg, wav, aac);
* RIP CD to audios of all sorts directly;
* Support using with command line;
* Combine several video and audio files to one video file;
* Demultiplex or extract video and audio;
* Multiplex video and audio to one file;

[code]

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