I use a lot of media sourced on the internet, mostly .mp4 or .mkv files. For example, one source that gives me problems is Youtube "surround sound" test videos. I often feel the surround sound is not as "advertised" in the media title. The surround sound does seem to output to the different channels but it feels more like a virtual or All Channels fake-surround to me.
My downloaded files from demolandia.net sound far better and convince me my setup is good. My kids think the Atmos file 'Audiosphere' is great. The audio clearly bounces around my 'audio sphere' and I've had more entertainment from that video file than many others I have. Is this a case of the media not being what is advertised, or a codec issue that my Receiver can't handle? Or something else? Any thoughts?