TEncoder is a multithreaded video and audio converter that uses MEncoder, MPlayer and FFMpeg. It can convert almost every video and audio type to each other. Subtitles with same name as video can be hard-coded into video. Up to 8 simultaneous encoders can be run so encoding time decreases. You can select between multiple audio and subtitle tracks. Extracting video or audio content is possible. Edit subtitle and audio delays and part of video that will be encoded. Effects like deinterlacing or cropping can be applied to videos.
TEncoder & TAudioConverter should certainly be added in portableapps.com apps because they are portable,they work fine and released under gpl.