In the case your slide source is configured wrongly and all slides are being captured upside down and mirrored there is an easy way to fix this. During recording you are not allowed to flip / change the source anymore. However, afterwards you can easily correct the problem using a photo editing program.
My favorite tool is Microsoft Office Picture Manager (since is is present on most desktops). It allows you to select all images in a folder, flip and save in the same place.
- Open the slides folder in the resulting recording folder
- Select Edit Pictures
- Now click on Rotate and flip
- Process both the slides and the thumbs folder completely
Now you can simply publish your recording with the encoder.