AFAIK, MoviePlayer will not transcode from the MP3 in which the audio your Divx file is probably encoded, into IMA. If you find out otherwise, let me know. I would love to be able to do this in one pass.
If you do it in two passes, combining the result is easy. Open the video stream in one MoviePlayer window, and the audio in another. Then select all and copy, say, the audio (treating it just as you would the text in a word processing application; I love the Mac's consistency of idioms). Next, click on the window with the video to make it the active window. Holding down the option key, pull down the edit menu, which will now show an option for "add"; use it. Btw, you may add more than one audio track (very useful for multilingual support).
You then have the option of saving the result as a self-contained movie, or as a "normal" one, in which pointers to the source files constitute the "normal" movie.
If you do it in two passes, combining the result is easy. Open the video stream in one MoviePlayer window, and the audio in another. Then select all and copy, say, the audio (treating it just as you would the text in a word processing application; I love the Mac's consistency of idioms). Next, click on the window with the video to make it the active window. Holding down the option key, pull down the edit menu, which will now show an option for "add"; use it. Btw, you may add more than one audio track (very useful for multilingual support).
You then have the option of saving the result as a self-contained movie, or as a "normal" one, in which pointers to the source files constitute the "normal" movie.