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1 17 Multiple video streams control for the synchronous delivery and playback

2

3 Web IP ,,, i

4

5 Abstract Multiple video streams control for the synchronous delivery and playback Yoshiyuki KOMATSU Recently, many kinds of video streaming services are provided by various providers on the internet. The internet can deliver multiple videos to multiple clients at the same time. In fact, the clients can combine various videos freely and watch them simultaneously. However, the videos simultaneously delivered must be synchronized with some playback timeline as to their simultaneity and relativity. They need the strict synchronization. Independent video sources asynchronized also must be accorded to their common clock when they are watched. Especially, it is important to absorb time-lag and jitter caused by differences of distance and paths from delivery servers when videos are delivered via the internet based on best effort policy. In this paper, a system which can make various video streams synchronized without any damage by network conditions during a playback is proposed. The client is able to see the streams delivered simultaneously via the internet. This system can develop a new way to have a fun in watching Internet video streaming services. key words streaming, braoadcasting, synchronization, multipoint, multi stream iii

6

7 RTP(Real-time Transport Protocol) RTCP(RTP Control Protocol) RTSP(Real Time Streaming Protocol) Quick Time Windows Media Real Player v

8 RTP RTP RTP RTP NTP (Network Time Protocol) NTP vi

9 vii

10 53 55 viii

11 ( 100ms) ( -100ms) ( 300ms) ( -300ms) ( 500ms) ( -500ms) ix

12 3.8 ( 500ms) ( -500ms) x

13 xi

14

15 1 1.1 ISDN IP IP F1 1

16

17 Web ISDN 10kbps ADSL 100kbps Mbps FTTH Mbps Mbps

18 1 1.3 ( )

19 RTP(Real-time Transport Protocol) RTP UDP RTCP RTCP RTP 1996 QuickTime RealPlayer RTP RTCP(RTP Control Protocol) RTCP RTP RTP RTCP RTP RTCP RTCP IP RTSP(Real Time Streaming Protocol) RTSP (RFC 2326) / IP RTSP Web 1 5

20 IETF Quick Time QuickTime4.0 Mac OS X Server QuickTime Streaming Server QuickTime Player RTP RTSP Windows Media Windows 98 OS 750 MPEG-4 MPEG-4 Real Player RealPlayer RealAudio 6

21

22

23 (Delivery Server1, Delivery Server2, Delivery Server3) 3 9

24

25

26 2 1 5 NTP

27 RTP RTP RTP RTP

28 RTP RTP 32 90kHz RTP RTP RTP

29 NTP fps

30 (30fps ) 16 65, ,777, ,294,967,

31 S pmax 2. S pmax F pmax1 T base 3. S pmax S others T base 4. S others 3 F others1 5. F pmax1 T base 6. F others1 7. F pmax2 8. F others S pmax S others

32 2 00:

33 S pmax 2. S pmax F pmax1 N base 3. S pmax S others N base 4. S others 3 F others1 5. F pmax1 F others1 6. S pmax S pmax S others 7. 6 S pmax S others

34

35 IP T 1, T 2, T 3 T 3 1 T 3 T 1 2 T 2 T

36

37

38 T 1 T 3 msec T 2 T 3 msec

39

40 fps 1 1/30 ( ) 60fps 1 1/60 ( ) msec IP NTP(Network Time Protocol) NTP (Network Time Protocol) RFC-1305 Version 3 NTP SNTP RFC

41 2.7 NTP 1 stratum 1 1 GPS NTP LAN 1 NTP NTP NTP NTP NTP NTP LAN NTP NTP msec

42 = P c P r P t 3 P a P a = P c + P r + P t (2.1) P a 28

43 , 12, 8, (P c ) (P r ) (P t ) (P a )

44

45

46

47

48

49 URL ID URL HTTP XML XML 35

50 URL

51

52

53 dummynet[8] dummynet PC 960kbps fps 33ms dummynet 39

54 PC Dummynet Bridge PC 100BASE-TX

55 ms 10 41

56 ms ms ms ms ms ms ms ms ms ms ms ms ms ms ms 33ms ms ms ms 33ms ms ms

57 ms 33ms ms ms ms 33ms ms ms ms ms 33ms ms ms ms ms 43

58 3 3.2 ( 100ms) 3.3 ( -100ms) 44

59 ( 300ms) 3.5 ( -300ms) 45

60 3 3.6 ( 500ms) 3.7 ( -500ms) 46

61 ms ms

62 ms ms ms ms ms ms ms ms ms ms

63 ( 500ms) 3.9 ( -500ms) 49

64

65

66 4 52

67 4 MAV QoS 53

68

69 [1] Yoshiyuki KOMATSU Kazunori SHIMAMURA A synchronous fashion of playback timing to use multipoint and multi-angle video streams synchronously NEINE05 pp [2] Yoshiyuki KOMATSU Kazunori SHIMAMURA A study of the path bandwidth measurement for the stable Audio-Visual stream distribution NEINE04 pp [3] FIT pp [4] Colin Perkins,, TCP/IP RTP,, 2004 [5],, Content Delivery Networks, 2003 [6],, ICMP End-to-End, FIT2002 vol.1, 2002 [7],, CDN Relaycast, 2002 [8] dummynet, luigi/ip dummynet/, [9] Ethereal, [10] VideoLAN, [11],,,,,,, GPS NTP, 12, 2000 [12],, NTP OS, 13, 2001 [13] Perl ++++[smart],

IP RTP 2 QoS i

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