Hi! Generally, most modern TVs can support a variety of file formats for playback through a USB connection, but it ultimately depends on the specific model and make of your TV. As for your specific situation, it seems that your TV may not support the x265 format. In this case, you can try converting your movies to a supported format such as H.264 (also known as MPEG-4) in an MP4 container.
You can use a video converter software such as Handbrake, which is free and open-source, to convert your video files to a compatible format. Make sure to select a video codec that your TV supports and a compatible container (such as MP4).
It's also worth noting that some TVs may have specific requirements for the bitrate, resolution, and framerate of the video files they can play. You can check your TV's manual or manufacturer's website to see the supported video specifications.
I hope this helps! Let me know if you have any further questions.