Not able to see the actual command sent to the FFMpeg

[Japollack]

This is more like an enhancment than an issue.

I would like to be able to see the final and actual FFMpeg command with parameters to pinpoint invalid commands and problems

The actual command could be sent to the output and/or read from the progress/completed event parameter.

This is especially important feature if I am not able to see errors from FFMpeg as all tasks are "completed succesfully" (if ever).

I had problem with the Engine.CustomCommand() not knowing what the method adds extra to my command.