revert LD_LIBRARY_PATH before calling ffmpeg #2842
Merged
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PyInstaller modifies the LD_LIBRARY_PATH variable. This affects the execution of files external to the package. It was affecting the execution of ffmpeg but is handled here as suggested in the documentation at https://pyinstaller.readthedocs.io/en/stable/runtime-information.html#ld-library-path-libpath-considerations
Fixes #2838