BitGravity’s Grounds-Up Approach to Content Delivery


DEMO REPORT: Watching TV clips on the Internet is like listening to the radio on your TV: Sure, you can do it, but you’re really missing the point.

At least, that’s what Perry Wu, BitGravity’s co-founder and CEO, thinks. BitGravity runs a high-capacity content delivery network (CDN) designed to carry high-definition, real-time video that scales to large numbers of concurrent users.

Pricing its services around half the cost of comparable offerings, it’s fueling the CDN price wars we covered in November. With the ubiquity of H.264 in Flash and hugely attended live events such as the 65 million-stream Live Earth event in July of 2007, high-bandwidth media is definitely here. In fact, BitGravity’s service streamed the DEMO presenters live to thousands of viewers worldwide.

We sat down with Wu, a former VC and serial entrepreneur, on the eve of his DEMO launch of live video services to discuss the future of Internet video.

“We think Internet video can rival the cable experience,” said Wu. “Today, it’s about putting video on the Internet. But those are just the starting requirements for Internet video because it’s interactive.”

Wu outlined several major differences between true Internet video and traditional broadcast video. For one thing, interactive video is random access, so delivery networks need to be able to quickly handle jumps from place to place within a clip. And with every video clip leading to recommendations of a dozen others, the networks need to be able to handle what Wu calls “logical switching” as viewers move from one stream to another.

Wu also cited content security, storage and encoding as important functions of an Internet media CDN. But some of the most demanding requirements come from interactivity. Wu showed us a beta of wedigtv, an interactive blend of game shows and audience participation that goes far beyond one-way broadcasting. “You can even imagine video games using this technology,” he said.

The company faces established competitors like Akamai and Limelight. In 2006, Akamai acquired streaming media management firm Nine Systems, and offers a variety of solutions under the name of Akamai Streaming Services. Limelight (which is currently embroiled in patent litigation with Level3’s ownership of intellectual property from Sandpiper Networks) has focused on streaming services and high-bandwidth media.

But Bitgravity thinks that rich, real-time media places new demands on the way CDNs are buildt. So Wu, along with CTO and co-founder Barrett Lyon, took a grounds-up approach to content delivery.

For example, many CDNs rely on the DNS protocol to pick an entry point into their network or a cache that’s near the client. This reduces latency by bypassing the error-prone Internet, but the back-and-forth chatter of DNS means the user has to wait for video to start. BitGravity takes a different approach: It makes its streams and servers look like a peer to adjacent carriers, resulting in less chatter and less wait. BitGravity also uses custom storage technology, convincing some of EMC’s suppliers to build custom storage devices.

BitGravity is trying to compensate for inherent problems with video standards, too. Modern video streams save bandwidth by only sending frame-to-frame changes, and transmitting a full picture — known as a keyframe — only occasionally. This means video players need to wait several seconds for the keyframe before playing. But Lyon says the company is experimenting with keyframe pre-loading to make video play instantaneously without having to wait.

Lyon’s previous company, DDOS-prevention service Prolexic Technologies, was just acquired by IPVG. Lyon sees similarities between the challenges of content delivery and the challenges of blocking denial-of-service attacks. “Both are availability problems, providing massive outbound resources,” he said.

“Right now, most of the industry is doing incremental improvement,” said Wu. If we’re going to use the Net for more than just TV, it may take a more fundamental re-thinking of how we get real-time media.

Alistair Croll is a frequent contributor to GigaOM who attended the DEMO conference in Palm Desert this week.




I’ll admit, they were pretty sketchy on details. What I was able to get (other than the experience on their homepage, which seems unusually responsive and speaks for itself to a degree) was that they’ve build custom components and are rethinking some assumptions.

Using BGP instead of DNS for regional association is a good example. The keyframe thing is cool too. But what I found most interesting was the founder’s background building denial-of-service mitigation services, because that’s really a problem of how to get out more content than you’re being asked for, no matter how much.

I’ll try to get some more specifics from Perry next time I talk to him. Believe me, it wasn’t for lack of trying!

Dan Rayburn

I’ve read a lot of articles like this about BitGravity lately but all of them seem to be really vague when talking about the service.

  • “scales to large numbers”… what is that number and at what bitrate?

  • “designed to carry high-definition” …. classified as what exactly?

  • “Pricing its services around half the cost of comparable offerings”…. what is the cost and who are they comparing it to?

  • “video can rival the cable experience”… in what way? quality? depth of content? interaction?


Great article. I’m pretty excited about the new interactive video advances happening in both software and being made by service providers. This Wu seems to be putting together a really well thought out plan. It will open up the true potential of on line entertainment to become more than was even imagined just afew short years ago. Cool.

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