AVI-Mux GUI

VI-Mux GUI is an application that allows to combine several video, audio or subtitle files into one file, with out without size restriction, allowing to configure properties of the output file to a deeper level than usual for such applications.

In the stream tree, you can see the streams you created, and you can set attributes of those streams, like whether or not a stream is a default stream, you can also extract some stream types (you might want to extract an audio stream from an AVI or MKV file).