The windows port of Avidemux cannot deal with CJK filenames...
Thanks for your attention.
And thanks the Avidemux team for this great programme. :D
What is CJK filename ?
Filenames that consist of Chinese, Japanese or Korean characters :D
There are no CJK fonts in your PC. Install CJK fonts.
If you want to write CJK as filename or others, it is necessary to get and use each language's IME.