If you are unable to open an MP4 file on our media player, try changing the video format. There are many good video converters available on the internet that can help you convert your MP4 to MP3, AVI, ...
copy C:\Users\path to\Desktop\ffmpeg-20190117-aceb913-win64-static\bin and add this path to system variable under environment variable. after that you can check it by open command prompt type ...
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