spigot~ alternative to better mix audio from 2 or more movies (music videos)?

I'm wondering if there's an alternative to use spigot~ to mix audio from a movie file that has an audio track? For example music videos?

I'm asking because when using spigot~, there are some limitations. For example it only supports qt jit.movie engine, often throws errors, sometime crashes, plus it slows down the playback performance a lot when sound is enabled during my test, the frame rate drops by more than 50%.