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Figuring out your problem will require a bit more information. What is the make and model media player that you have? How are you connecting it to the tv and to the laptop?
Are you playing media files, like mp4, avi or mkv files? Or are you trying to play ISO files made from DVD’s or Blu-ray?
Where are the files stored? Are you using a usb flash drive, or do you have an external hard drive connected to the media player? Or are you streaming from a computer through the media player (either wirelessly or wired connection)?
You could also be using an online service I suppose, like Netflix or Hulu. But you can see, without more information we’ll just be fumbling around in the dark.