People can't magically know what you are doing, so no one can answer your question.
What version of MeGUI are you using? How do you use it? Is it one-click mode or do you just use the muxer or what? What kind of files are you trying to mux and what container is your target? What crashes, MeGUI or the muxer? Does it actually crash or just abort? What does the log say?
If you answer those questions maybe someone will be able to help you.
By the way you should have posted this in the "MPEG-4 Encoder GUIs" subforum. Please don't crosspost, ask a moderator to move your post.
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