From Hoo Technologies:
AVI MP4 Converter converts AVI to MP4 and MP4 to AVI. It is an easy to use and ALL IN ONE video and audio converter software. AVI MP4 Converter not only converts between AVI and MP4, but also convert media file to the major formats such as MPEG, WMV, ASF, FLV, 3GP, VOB, TS, MOV, DV, and so on. The software also converts between audio formats and extracts audio from video files. With the AVI MP4 Converter, you can convert your video files to compatible format of your portable devices, for example, iPod, iPod touch, iPhone, Apple TV, BlackBerry, PS3, PSP, Wii, DS, Xbox360, Archos, Creative ZEN, iRiver player, Zune, and most MP4 player, PDA, and mobile phones. AVI MP4 Converter supports more than 90 video and audio formats. You can easily set encoding parameters in the software, such as video codec, video bit rate, video frame rate, video size, audio codec, audio bit rate, audio sample rate, audio channels, and audio volume. AVI MP4 Converter supports batch conversion. You can convert bulk of video and audio files to another format at a time. And the software is full compatible with Vista.