My recording look great when I play them through the media player that my TV has. The problem with that player is some of the recordings don't play. It's a player called Video that's part of the TV's Apps and it has no way to change settings. Otherwise the recording that it plays look great.
When the same recording are played with the Roku Media Player they look washed out and sometimes there is a studdering.
I'm recording using a Hauppauge HD-PVR2 from a FIOS cable box. I record at the highest resolution. It's about 13.5 Mb/s. They are H.264 files saved as .MP4.
They play just fine through the TV's App however some of the folders in my PC's external hard drive won't load. They all load fine using the Roku but the overall playback quality is worse. Using the Roku Media Player the video stutters a bit on fast motion and it has less contrast then when I play them through the TV's App.
I have a Sony XBR X900F 4K TV I just bought.