If you want to determine if your TV supports playback of H265/HEVC video files for smooth streaming or playback, there are a few things you can look for. First, check the user manual or specifications for your TV to see if it lists H265 or HEVC as a supported codec. If you can't find this information, you can try searching for the model number of your TV online and looking for its specifications on the manufacturer's website.
Another option is to try playing a H265/HEVC video file on your TV and see if it works. If the video file does not play, or if it stutters or buffers frequently, then your TV may not support this codec. In this case, you can try using a media streaming app like Plex, which can transcode H265/HEVC files to the H264 codec format automatically for playback on your TV. Alternatively, you can use a video converter tool to convert H265/HEVC files to H264 format, which is more widely supported by TVs. This may be necessary if you have a large library of H265/HEVC files that you want to play on your TV.