fix func of FfmpegLoad for unexpected file format

雾聪

2023-10-12 00e038e22009a2014ba52f315045d875e96c93a7

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<?xml version="1.0" encoding="UTF-8"?>
<Workspace
   version = "1.0">
   <FileRef
      location = "self:">
   </FileRef>
</Workspace>