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US007984174B2

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(12) Ullltfild States Patent (10) Patent N0.: US 7,984,174 B2 Rideout (45) Date of Patent: Jul. 19, 2011 (54) MULTICAST VIDEOCONFERENCING (58) Field of Classification Search ................ .. 709/226, 709/201, 231, 230, 233 (75) Inventor: Neil Rideout, New Waterford (CA) See application file for complete search history. 56 R f C't d (73) Assignee: Supracomm, TM Inc., Reno, NV (US) ( ) e erences I e * N _ S b_ d_ 1 _ h f hi U.S. PATENT DOCUMENTS < > once. u Jew any we a1mer._ I ewrm 0 I S 5,727,002 A , 3,1998 Mmere, ,1, jjjjjjjjjjjjjjjj H 714,748 Patent 15 extended er adlusled under 35 5,832,229 A * 11/1998 Tomoda etal. 709/227 U-3-C~154(b)bY 905 <1aYS~ 5,893,091 A * 4/1999 Hunt et al .. 707/3 6,288,739 Bl * 9/2001 Hales et al 348/14.07 (21) App1_ NO_; 10/534,370 6,415,312 B1* 7/2002 Boivie 709/200 6,751,218 Bl* 6/2004 Haglrahlm tal 370/390 >I< <22) PCT Filed: Nov-12,2003 3:32:25? 31- 2/588? %fi§31;1;1;1;';;";1:T111111: 383/321 2004/0022244 Al* 2/2004 Boers et al. ................. .. 370/390 (86) PCT No.: PCT/US03/36349 * Cited by examiner § 371 (e)(1)> Primary Examiner — Minh-Chau Nguyen Q)(4) Date: Jul32006 (74) Attorney, Agent, or Firm — Perkins Coie LLP (87) PCT Pub. No.: WO2004/044710 (57) ABSTRACT In one embodiment, the invention is a method of transferring PCT PubDateMay 272004 data. The method includes receiving a first video data stream tfit h'.Th thdl'ld lt' t' th <65) Pri<>rPb1i¢=»fi<>I11>=»t=» firstvifIeId1d;t:s1fl"ear1fi?flnc%mepflgssledZndiagvufdfristffilgugfl Us 2007/()()()58()4 A1 ]an_ 4, 2007 a network. The method further includes receiving the first video data stream at a second machine. The method also (51) Int CL includes playing the first video data stream on the second G06F 15/16 (2006.01) maehlne (52) U.S. Cl. ....................... .. 709/231; 709/230; 709/233 23 Claims, 39 Drawing Sheets

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FRAME TYPE: 1 B B P B B P DISPLAY ORDER: 1 2 3 4 5 6 7 TRANSMISSION ORDER: 1 3 4 2 6 7 5

FIG. 1

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v=2 |P |PT=SR=200 ILENGTH
1 W SSRCOFSENDER
NTP TIMESTAMP (NETWORK TIME)
I NTPTIMESTAMP
RTP TIMESTAMP (NETINORK TIME IN RTP UNITS)
SENDER'S PACKET COUNT
SENDER'S OCTE' COUNT
SSRC or FIRST COURSE
I CUMULATIVE NUMBER or PACKETS LQST
EXTENDED HIGHEST SEQUENCE NUMBER RECEIVED
_ INTERARRIVALJITIER
I.AST SR
DELAY SINCE LAST SR

FIG. 4

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