White Text on Yellow Background

Movie or television subtitles are fine. It preserves the voice of the speaker while allowing me to understand the content. However, how do people read white text on a yellow background? In this case, white text on a yellow shirt. Contrast is important for readability.

Or white on light blue.

Or white on white.

I would really like to understand the information your speakers wish to convey. If it were a drama where I could tell from tone and body language, then it would not be so annoying. This is a documentary so everyone has that explanatory tone.