Modern TVs and Stereo units use HDMI ARC (Audio Return Channel). On my trailer stereo, the input for HDMI ARC is TV-Audio 2. There should be an HDMI cable attached to the back of the Stereo/DVD player unit. That will provide both the video output to the TV for the DVD player, and it will also accept audio input if plugged into the TV HDMI port that is labeled ARC.
You will also need to set the audio output on the TV to ARC. I have three components that all integrate together lovely - the Stereo/DVD, TV, and a Raspberry Pi with Kodi for playing movies saved on a hard drive. My TV remote will control both the Stereo/DVD player and the Kodi on the Raspberry Pi via HDMI CEC. I only need 1 HDMI cable between the Raspberry Pi and the TV, and one HDMI cable between the TV and the stereo/DVD player.
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