Step 2: Add Streams

- Click the Add button and select a file you wish to mux
- Go through and select Your video, Audio and Subtitles. Ensure the correct files are listed in the "Input Files" area.
- To ensure player compatibility, Set the video as the first muxed stream. Certain players expect Video first for correct operation
- Players generally use the first audio track they find as the default one so move the audio track you want as default to directly below the video track and then put the other ones right after.
- Some players do a similar thing with subtitles, place the default subtitle track right after the audio streams. Source files may also contain more than one stream which can make some of this slightly more complicated.
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