1. Freemake video converter (Download Link)
2. Client content
Download and install Freemake video converter (make sure to not install any included adware)
Open up the video converter and you will be greeted with this:
Drag and drop the videos you want to convert into the software
Proceed to pressing the edit button and then click the rotate button to get it into the desired orientation.
Now hit convert and select AVI (if using a XMP unit) or desired format
And then click convert / change output parameters (resolution. etc) and wait for the conversion to finish.