Comments: Place Shifting by IP Communications Clients

Since the cat is out of the bag ... the whitepaper that you reference is a bit out of date. Our current video technology is standards complient H.263 with our "psycho-visual" model built on top of the H.263 system. This codec still operates at 30 fps with 320x240 video. However we can now achieve that fps and size at 256kbps instead of 440kbps. For lower bitrates we use a smaller resolution. The delay is still 15ms or less depending on the speed of your system.

Aron Rosenberg
SightSpeed CTO

Posted by Aron Rosenberg at July 10, 2006 10:28 PM


Thanks for posting the update as a comment. Can you please clarify whether your client will interwork with another client that uses only H.263 codec? Also can you comment on the patent/royalty restrictions on H.263 codec? Thanks.

Posted by Aswath at July 11, 2006 05:13 PM

Our client can interoperate with other SIP and H.263 devices. However we have not opened up our SIP network to non SightSpeed endpoints yet. We will be doing this at some point in the future. In our offices, SightSpeed can place and receive calls from various softphones and hardphones

As for royalties, normal H.263 is not subject to any active patent pools. However certain parts of H.263/2000 are affected by active patents and as such SightSpeed doesn't support H.263/2000.

Posted by Aron Rosenberg at July 11, 2006 06:33 PM