I had this issue ( When rendering out sequencer scene with a TV playing Media Texture on it), You playback the render and the video on TV screen is way too fast. To fix it go into Level Blueprint, where you can set the speed for the Media Texture and slow it down from an Event tick. Please see Blueprint and example attached. Create a variable called TV Screen which is a Media Player type, pointing to the File Media Source. Then add Set rate node and Multiplication node to rate on Set Rate Node. Connect Set Rate and Multiplication node to event tick. Make Multiplication node a really small amount. ( I used 0.09) This worked for me. It might not be 100% accurate but it slowed the Media File on TV down to an acceptable speed.
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