QT calls the API of ffmpeg, and the error is as follows:
These two errors are caused by the lack of dynamic libraries in the running directory,
Dynamic library:
Program running Directory:
Directly copy all DLLs to the running directory.
QT calls ffmpeg API with the following configuration:
1. This document 
Put in the project directory
2. Import and store files and header files
3. Add corresponding header file
4. Copy a dynamic library in the running directory
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