Deleting Chapter and/or Trickplay Images

[mildlyjelly]

Personally I am fine with the size and quality of the trickplay images. 10 second intervals should be enough. If I were to remake mine, I would probably make them 5 seconds, but 1 second is rather silly; I can basically just watch the show using the trickplay... The only reason I changed the settings is because it was still running even after 36 hours. That's when I enabled hardware acceleration which made the process reasonable (though had I left the interval at the default, it probably would have been much faster).

Your screen shot is of chapters, not chapter images. Chapter images are basically like trickplay images, but you only get one per chapter.
I'm not sure if there is a way to hide chapters though.