I’ve recently tested different video formats for the Shield TV, and discovered that it does seem to support YUV422.I had to reencode in YUV420.
YUV422 is supported by H.264 High 4.2.2 Profile, and H.265 Main 4.2.2 10 profile, since v2.
I’ve not found any detailed specifications of video formats supported, only raw data such as
Video Features 4K Ultra HD ready 4K playback at 60 FPS (VP9, H265, H264) 4K capture at 30 FPS (H264, H265) Supports: MPEG-2/ MPEG-4/ Xvid/ DivX/ WMV9/ ASF/ AVI/ MKV/ MOV/ M2TS/ MPEG-TS/ H.263/ H.264/ H.265/ VC-1/ VP8/ VP9
Do you have found more details on these supported formats somewhere ? Thanks for your feedback.