How do you connect DVD and TV so they can be alternated to headphones?

To connect a DVD player and a TV so that they can both be alternated to headphones, use an audio splitter or an AV receiver with headphone output. Connect the DVD player's audio output (usually RCA or optical) and the TV's audio output to the splitter or receiver inputs. Then, plug your headphones into the headphone output of the splitter or receiver. This setup allows you to switch between the DVD player and TV audio easily.