QxR files often contain multiple audio tracks (Commentary, 5.1 Surround, Stereo).
Most QxR encodes are 10-bit, which causes "artifacting" on 8-bit displays.
Ensure your TV supports mkv containers. If not, you may need to remux the file to mp4 . To help you get this running perfectly, could you tell me:
I can provide the exact once I know your setup!
If you downloaded a 4K QxR encode on a 1080p laptop, the downscaling process is heavy. Try the 1080p version instead.