HD Video Converter Factory is a program that can convert videos from/to most popular formats. The program supports more than 150 video formats, and performs conversions in high-definition quality. It even support multitrack HD videos.
You can choose any number of files to convert, and create a list with the titles you want the program to batch-convert. For each entry, you can define separate video settings (resolution, encoder, aspect ratio, video bitrate and framerate) and audio settings (number of channels, encoder, volume, audio bitrate and sample rate). Alternatively, you can choose any of the pre-defined profiles to perform conversions for various portable devices, DVD, Flash, common video formats and even common audio formats. The latter option implies that the program will extract just the audio stream from a video, and will save it as an audio file, which you can then play on your favorite audio device or player.
The trial version of this program will put a watermark on each target video warning the viewers that the video was converted using an evaluation version.