My wife got us a Roku 2 streaming device for watching shows/movies. The set-up on that unit is not very sophisticated, no settings for PCM audio for example, but I was able to get it connected to the HD621 and 861v4 and outputting audio to all speakers in Pro Logic II processing mode. For movies with the kids, it is ok, they like the surround sound, but It seems 2-channel stereo over HDMI is about all I am going to get. Dolby Digital Plus and some other newer codecs are not supported by my legacy system.

For an 861v4/HD621 combination, is logic surround about as good as it gets for streaming shows/movies?

Theater: 861v4_LPS, 818v3, HD621, Oppo 203, Lumagen Pro, DSP8000SE, DSP5500C, SW1600x2, DSP5500, Epson 6040UB, PS4
Living room: 861v4_LPS, HD621, DSP8000SE, DSP5200C, Oppo 203, Lumagen 2143, 818v3, Sooloos/MC600 Bluesound Node
Bedroom: M80
office: G68D, DSP6000
Garage: DSP5000
Storage: M33s, DSP33s, DSP5k, 501, 518, M1500, G98DH, SW1600