How can I review logs of done operations?

After running next command:
`
await FFMpeg.Xamarin.FFmpegLibrary.Run(Forms.Context, cmd);
`
How could I review FFMpeg logs? 

I've tried to add:
`2> logTest.txt` or `FFREPORT=file=ffreport.log:level=32` but still can't find any log info (no log file is created or no additional output during the debug is shown)