Content Aware Fill Not Working Properly

When you use content aware fill the transparent area you are trying to fill needs to be as small as possible. Your mask is way too big. You are asking way too much. I would have corner pin tracked the center of the boock cover in Mocha AE, saved a comp frame as a Layered Photoshop file, and removed the text in Photoshop. It would take about 1/10 the time and be more accurate.

If you really want to try Content Aware fill you need to take a copy of the footage, apply some color correction and effects to generate a black and white copy that you can use as a track matte to mask just the type. Something like this:

Will give you something like this:

Will give you something like this:

But in my test I could still see th eedges of the letters, and they will dance around a little bit as the book opens.

Mocha AE is the way to go. When using CAF you must make sure that the matte is just slightly larger than the area you want to fill and you need to test the three differfent fill modes to see which works better. The screenshot with the arrows pointing out the problems was pretty good. Image Blend was a little better, but the edges still danced a bit when the book opens. It will probably work better than it did with my screen capture of your screen capture.