Salman Abdul Baset wrote: > I just watched the presentation and it is really cool. Couple of questions: > > (1) Does media relaying work for voice communication? > (2) What about TCP connectivity for signaling and media? Can peers > automatically negotiate the transport protocol? Will UDP remain default? > (3) What about integration with cellular/other VoIP? > (4) What are the designers views on the work in P2PSIP WG? > (5) Can the designers compare RTMFP with Octoshape's solutions? > > and most importantly: > (6) Is the service ready to replace Skype? > > RTMFP Groups is meant for the one-to-many and many-to-many cases, whereas the baseline RTMFP added in Flash Player 10.0 is for the one-to-one and one-to-few cases.
So, to answer your questions: 1) If you are doing RTMFP Groups, then yes, application-level multicast relays voice, video, and data. 2) TCP isn't supported, because it doesn't make any sense to run RTMFP over TCP. RTMP exists and works over TCP, but only for the client-server cases. 3) Flash Player 10.0 and later can play Nelly-Moser, Speex, MP3, and AAC and can encode Nelly-Moser and Speex. Transcoding to/from Speex isn't difficult. 4) No official comment. I follow the P2PSIP work, and I used to comment more back when I had time to actually be on the list, so you can read some of those older comments for my views. Generally I personally believe that (while it does have the drawback of being proprietary at this time) RTMFP is a superior transport to trying to do signalling over SIP+SDP and media over RTP, and I believe reuse of the cost of session setup is better than the flexibility one might have by completely separating signaling from media. A quick demo of a maximum rate file transfer between a pair of peers along with higher-priority voice traffic helps explain why I think that RTMFP is a better media transport protocol, especially since you also get encryption and IP address mobility with no added complexity. 5) No comment. Because Adobe did a trial deployment with Octoshape, I was not allowed to look at their work at all and so haven't even seen it in use. 6) Most of what Skype does can be implemented using the pre-Groups RTMFP. The peer-to-peer directory service could be re-implemented using RTMFP Groups. Some of what Skype does, Flash Player won't do mostly for business/security reasons... while Skype was able to have a EULA that lets your computer open up TCP server ports and relay media, you'd never let Flash Player generally have that capability, so Flash Player is definitely more limited in how aggressively it can try to make peer-to-peer work... though client-server fallback is at least as good if not better in Flash Player. Matthew Kaufman _______________________________________________ p2p-hackers mailing list p2p-hackers@lists.zooko.com http://lists.zooko.com/mailman/listinfo/p2p-hackers
