Let me add a report to all this. I bought my Chromecast about 2 mos. ago. Had trouble setting it up. Most use their cell phone. I just bought one for the first time (a cell phone) but don't have service yet. The docs said I could set it up via a tablet connected to my router. Chrome had a bug preventing me. I had voice contact with Chromecast tech support, whereby they conviniced me and walked me through setup via my new smart phone with wifi. Later I switched the tablet to Chrome Canary. Canary didn't have the bug and I could re-setup via the tablet. (I don't remember why I wanted to re-set it up.) All this was merely why I was in contact with support at all.
After a short time, I concluded that Chromecast isn't adequate; I needed Chromecast Ultra and I went and bought it. I've had two more lengthy calls (totally probably a couple hours--and his Phillipine accent isn't bad) with the same rep trying to solve a couple mysteries/problems, the greatest of which was why can't I get 60fps video out of the unit. In the process he had me do direct casting from a Youtube video. I picked one I had uploaded long ago that I KNEW was 1080p60. When I used the cast feature built into YT, it worked BEAUTIFULLY. Stunning picture, stunningly smooth 60 fps action throughout with no stutters whatsoever. You couldn't tell this was not live TV. (I have a 32" 1080p RCA TV.) THIS proved that Chromecast can do it, but we had to use the ethernet connection, not wifi.
We could not get LOCAL files to play successful at 60fps. He was going to have his supervisor call me later. But the supervisor never did. I think it's because the answer is, Chrome cannot do it. I think I found the reason why; it's that to cast, Chrome has to re-render the video before streaming to the device. This is for "cast tab" as well as "cast desktop". Apparentlyj, individual sources of video, such as Youtube, need to implement the casting protocol and have a cast button on their webpage. (Youtube does have that cast button now.) So it appears that none of the players that SVP will work with, does casting of the player's output. Hence there IS a need for an SVP "something" to send output directly to a Chromecast Ultra. If this was here now, I'd definitely buy 3 copies of SVP Pro