remux!

MKVToolnix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows. They do for Matroska what the OGMtools do for the OGM format and then some. The latest builds now have the ability to create WebM compliant Files.

Subler is a Mac OS X application that opens media containers, allows you to add or remove media tracks inside them, and then saves them out again. In the specialized language of the video world, Subler is a “transcoder” or “demuxer” depending on how you use it. It’s dedicated to creating MPEG4 files (.m4v, .mp4) for iDevices.

mkv/avi to mp4 converts mkv and avi files in h264 video to mp4 files without reencode the video stream. Subtitle will be embed as soft subtitle. Convert speed is fast as video is not reconverted. Works on iPad, etc. mp4box, mkvextract, beSweet, eac3to, mediainfo are used.

MkvToMp4 can change the mkv to Mp4 without reconverting/transcoding video (If the original video in H264 format). Support for multiple internal and external audio tracks. Support subtitle formats: srt, ass, ssa, ttxt. Changing colors for subtitles. Add and edit tags for Mp4 files (m4v, m4a, m4b). Searching tags on TheTvDB, TheMovieDB and iTunes web sites. Artworks and chapters for Mp4 files. Encode video for non-h264. Correction of the atoms in Mp4 files to be able to change the audio and subtitle on Apple devices. English and Russian interface. »

MKV2MP4 is an application that can convert video files in the MKV container format to more compatible MP4 video files.

MKVtools was primarily designed for processing mkv files for use in DivX enabled DVD players, it's capabilites have been expanded to allow for the input of most standard video file formats. As the name sort of implies, MKVtools is a graphical interface for a variety of tools useful for processing video files.