He sent us some info on what OTOY was working on, something about graphics processors in a server setup that could stream games to any client. We didn't really understand what he was talking about, since 'cloud' and all that wasn't well defined at the time (this was in '08, IIRC), but there was enough there to pique our interest. We emailed back asking if we could see him that afternoon, and he said that shouldn't be a problem - he was setting the booth up that evening before the conference proper started on the weekend, and it might be the best time since it was quiet there.
We drove up, found his tiny booth - the smallest of the lot, in a dark corner, next to the much larger rooms being setup by ATI, NVidia etc. He had one screen, one PC, a couple of phones and a pocket PC (believe it was an iPaq). He plugged a playstation controller into the PC, opened up the OTOY gaming application and scrolled around a half-dozen or so games on the screen while he explained what was happening.
NVidia had built a server-side GPU cluster which they were trialling out. It was a number of servers each with a dozen or two GPU's built into them which would directly stream their output over the internet (compressed) to the client. He fired up Grand Theft Auto 3 and we watched him while he walked around the city, getting into cars, driving around and then hitting top speed over hills etc. while the framerate didn't miss a beat.
The debug stats in the top corner showed that he was using 60-80KB/sec of bandwidth while playing. He explained that each frame was being sent down over the internet from a co-lo center. The ping time was 15ms, meaning there wasn't much lag. The servers were processing the input, playing the game, and then sending the output back. The codec in the prototype was nothing more than a series of JPEG images sent at 15-60+ frames per second. They said then that they would have something much better than that at some point, and I guess this Javascript + WebGL is what he was referring to.
We still weren't super impressed, since he had a controller and a big screen, so he just as well could have been running a playstation or other console underneath the table.
But then he picked up one of the phones, opened a Java applet and connected to the same game. This time I held the phone while he controlled the player and we had this tiny phone that could not have had more processing power than an early 386 playing one of the newest computer games on the market at the time in full color, at full screen and at full speed. Totally and completely blown away. He switched in and out of other games within seconds.
The next demo was opening up a web browser, pointing it to the web address, then watching the same game render in ~30 fps as the browser pulled down JPEG images and refreshed with JPEG (again, the very simple 'codec'). Utterly amazing.
We ended up spending hours with him, while he explained their plans and how the future of gaming will all be server-side. Since then, I have seen the OTOY name come up again and again related to breakthroughs in cloud-based gaming. These guys are really smart, and really ambitious.
Techcrunch ended up writing up an intro to what we saw a couple of months later (the conference was a private conference, IIRC, and our meeting was off-the-record, if I remember correctly).
The reason why we didn't publish everything right away was because I was very skeptical about some of the claims. He was a very good salesperson, and it is always difficult to distinguish those who are smart and sales savvy but have substance, and those who are just full of shit. Jules and OTOY were definitely the former.
In terms of my questions, I was most concerned about the lag issue and how this would work with users around the world who couldn't be near servers. I went back and forward on tech issues for a while on email until I was very convinced that not only was this possible, but it was almost certainly the future of gaming (why have all these GPU's that can't be upgraded on desktops and in consoles when you can place them all in the cloud - better utilization, better upgrade path, better pricing - eg. all the cloud benefits).
Here is the later story Techcrunch wrote:
http://techcrunch.com/2008/07/09/otoy-developing-server-side...
Here are all the OTOY stories at Techcrunch from the past 6 years, you can see the things they have been working on:
http://techcrunch.com/2008/07/09/otoy-developing-server-side...
Consider the following: Let's say the server gets 60fps, that is a frame is rendered in 16ms. If the compression takes another 16ms (charitable!), and the ping time is another 16ms, plus 16ms to decode on the client (plus 16ms to display!), then by the time you press a the 'fire' button to shoot, until you see the output, 5-6 frames have going by, or about 80-96ms, and that's assuming some pretty optimal best case.
OnLive was measured in the range of 150ms to 250ms input lag. This is just not acceptable for twitch gaming IMHO.
> The debug stats in the top corner showed that he was using 60-80KB/sec of bandwidth while playing. He explained that each frame was being sent down over the internet from a co-lo center.
I'm wondering what kind of miracle makes a video game display streamable at that speed with any form of acceptable quality (not even talking about 1080p@60Hz), especially given the following:
> The codec in the prototype was nothing more than a series of JPEG images sent at 15-60+ frames per second.
A single acceptably lossy typical JPEG game shot at 1080p is north of 600~800kB, while even one at 720p (typical of a '08 laptop) come up being 150~300kB. Below that you start to get noticeable artifacts.
Even if the game engine/platform knows what has been updated and only send deltas of sort (again taking the series of JPEG images case), you still have to account for the worst case, that is basically the whole screen changes at once, sixty times per second.
And indeed, in the Steam video, you can see throughput data at the top: when nothing's moving the value is as expected very low, but you immediately notice the peak at 9Mbps when the L4D video ends[0], with typical values during the video at 4~6Mbps, which is much more inline with a 1080p stream. Even the fading Source logo produces a 2.5Mbps stream (which produces very small diff areas), at 85% quality. There seems to be some cap at 48Mbps.
You can also see various timings, and the adaptative compression kicking in on the 9Mbps section, where you can read:
capture: 2.196ms
encode: 4.811ms
decode: 6ms
quality: 70%
BTW, what's with the monotonically increasing with time stream = ${p}% value? That makes it look like a streamed video, not an interactive one. Not being suspicious but it felt weird.
[0]: https://www.youtube.com/watch?v=FRtBuP2-_pA&feature=play...
Similarly, by using a decently parallelisable image compression codec (JPEG2000?) it should be possible to compress with the advantage of the many GPUs, too.
16ms transfer time is certainly kept generously low, but beyond that, 16ms decode is something I won't comment on due to the variability of implementation speeds (though it would be done in native code, of course) but 16ms further to display... 32ms to decode and display a JPEG? I'm pretty sure I've seen MJPEG streams at higher than 30fps before!
Back of a napkin they might be, but I think the figures in this post might require further thought.
Edit: again, to be clear, I'm not suggesting that they are using all of these advantages right now, but the idea that this can't reasonably be done for twitch gaming, even today, strikes me as bizarre, when they are trying to set up a system with whatever custom technology is required to make it work.
OnLive and Gaikai worked quite good for what they were, but they had much higher bandwidth requirements and still didnt feature really high res.
We did try out the web application from the office later on. It worked ok, but you could tell that bandwidth and lag were going to be issues.
Note to anybody else reading this as well: don't take my numbers as gospel, I probably shouldn't have included them since I was not 100% certain of them. What I do know for certain is that the method was just refreshing JPEG's and you could tell the quality was low (it looked great, but at times the picture was the equivalent of a full color photoshop photo exported at a quality level of 2 or 3).
The compression definitely wasn't working across frames, just each frame.
"At one point, Jason says "one GPU core per instance." But actually we're told that the technology scales so efficiently and cost effectively that you can allow anywhere from a minimum of 10 users per GPU, up to 100 depending on the application"
10 users per CPU? 100? This sounds like wishful thinking and vast hyperbole to me. GPU's don't really like so much context switching, but more than that, a modern game tends to saturate system performance, not just RAM, but VRAM, GPU cycles, and CPU. The idea that you're going to virtualize a couple of instances of Crysis or Call of Duty onto a single GPU seems preposterous.
http://techcrunch.com/2009/06/16/videos-otoy-in-action-you-h...
OnLive had similar problems overhyping the scalability and economics of their service.
So Nvidia can do 25 users per GPU at the moment with their "hypervisor aware" VDI cards. That's first gen.
The real trick will be doing texture swaps in conjunction with compression scaling to account for changes in network latency. That shit will be fucking magic.
But even if you get this perfectly scaled, overall latency/contention will make remote gaming over WAN suck for a mass roll-out with today's broadband and thus limits the addressable market.
edit for tenses, i haven't slept in 36 hours.
What does this mean?
Get over it. JS is slow, takes ages to load and drains battery in minutes. Just try to open large PDF in Firefox with its pure-JS viewer.
In an interview on the Debug podcast, Don Melton describes hardening WebGL, which involves hardening the whole stack down to the hardware level, as a significant challenge.
http://donmelton.com/2013/03/25/im-on-the-debug-podcast-this...
I wouldn't hold my breath.
They lost it with application and the cloud but they're holding on to the game segment pretty tightly. That's a theory a few programmer have with microsoft and why they chose to create directx.
Frankly, 25% better compression than h.264 for the same content and signal to noise ratio would be such a newsworthy accomplishment that I am very skeptical... doubly so because that's not described as the innovation, but the fact that it runs on Javascript and WebGL is supposedly the strong point.
"A web browser based demo service is also available for Windows PCs and Intel-based Macs running Mac OS X 10.5.8 or later enabling trials of games to be played without the need to download the OnLive Client."
So I guess this is like that only delivered "natively" without the need for a flash or silverlight plugin? Is that the big game changer? I'm a bit confused.
The most interesting part of the OP was the comment of how CPU work can remain local while the GPU work is offloaded to a remote GPU cloud. That is a very intriguing idea and smacks of Plan 9 a little.. however, I've been waiting for years for external Lightpeak GPUs to appear so little laptops could become gaming laptops when docked to it. But alas.
And yet here we have.. latency, on top of all the other problems. Somebody enlighten me.
As far as I can tell, the breakthrough that OTOY is claiming is this:
- They've developed a new video compression format and implementation that provides better compression ratios than h.264 [which implementation?].
- Their new format can be encoded very efficiently using a GPU-based encoder.
- Their encoder is very low-latency.
- They have a decoder written in JavaScript that can run in the browser.
- Their decoder is very low-latency.
All the cloud/streaming/remote desktop stuff is somewhat ancillary to this.
However, one of the Mozilla guys is quoted as saying it was built from the ground up for browsers (and the vague descriptions of the old codec, don't sound like a normal codec) so maybe they're just repurposing the name.
Edit: I guess the main gist of this product is that it's remote desktop in your browser, without any plugins, and it can provide you with a full desktop experience, while boasting a light bandwidth footprint even with HD video applications. It also seems to allow you to tap in to cloud based computing infrastructure at the same time. While neat, it seems niche, and unlikely to rule the desktop. It also doesn't seem efficient to have an office full of computers streaming a remote desktop of MS Office, instead of just running it natively.
You can get streaming games and video today with RemoteFX on Windows Server, even streaming to ARM Windows RT devices over Remote Desktop. GaiKai has an implementation ready to go for PS4. Other than the clever engineering required to get a decent video codec going in JS, I fail to see the benefit here other than not needing to install anything.
Hell yeah.