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MKVtools is a collection of tools used to manipulate video files. It's primary purpose is to convert mkv files into more user friendly formats for playback on a variety of hardware. MKVtools is trialware - only $4.99 for full functionality, though it will function unregistered, with some minor limitations.
Features: Convert videos to either .avi files or .mp4 files. Extract the selected .mkv tracks as individual video, audio and/or subtitle files. Intuitively select desired video, audio and/or subtitle tracks to procces, with the ability to verify the selections using video preview. Use presets for one step encoding or passthru copying for playback on a variety of hardware. Embed selected subtitle track (i.e., hard subtitles) into the video. Control the font, size and positioning of the embeded subtitles. Split .mkv videos into sections of a specified file size or by start/end time. Extract or delete tracks from .mkv files. Join, mux and change the pixel aspect ratio of .mp4 videos. Add jobs to a queue either individually or in batches via drag and drop so you can process multiple files overnight (registered copies only).