The best Audio Converter alternative to MKVToolnix is FFmpeg, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to MKVToolnix and seven of them are Audio Converters so hopefully you can find a suitable replacement. Other interesting Audio Converter alternatives to MKVToolnix are Shutter Encoder, MakeMKV, Video Transcoder and Voukoder Pro.
Comprehensive multimedia framework for decoding, encoding, transcoding, muxing, demuxing, streaming, filtering, and playback of nearly any audio or video format, with command-line tools, integrated libraries, portable code, and regular security updates for users and developers.
Almost everyone thinks FFmpeg is a great MKVToolnix alternative.
Shutter Encoder is a free professional encoding and conversion software for everyone, developed with video editors.
Rip DVD and Blu-Ray discs to MKV format with lossless preservation of video, audio, chapters, and subtitles. Supports decryption of protected discs, multi-track selection, and streaming output. Retains original quality and meta-data for personal backups.
Video Transcoder is an application which uses the open source program FFmpeg to transcode video files from one format to another.
Voukoder Pro is a system wide video- and audio encoding service that improves your media encoding experience.
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.
Professional video encoding for humans
Simply the best way to get your videos subtitled, metadata tagged, chapterized, encoded and uploaded to your portable device or website. RoadMovie 2 brings you "video-encoding-super-powers" in a friendly and easy to use interface.
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There is no graphical interface, only console I/O.