What are the exit codes of DVDFab? You know, the value returned to the caller process when the application exits:
I call DVDFab from a command line, and sometimes I get a 0 and sometimes a 4.
I call DVDFab from a command line, and sometimes I get a 0 and sometimes a 4.
![Confused](https://forum.dvdfab.cn/core/images/smilies/confused.png)
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