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Multimedia via Data Networks. Agenda. IP services in mobile telephony Voice over IP (High Definition) Video over IP Video on demand Video conferencing Download. Integrated Multiservice Networks—Data/Voice/Video. SNA. Data. Multiservice Network. Voice. Video. Packet-Based. Internet. - PowerPoint PPT Presentation
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Multimedia via Data Networks
Agenda
IP services in mobile telephony Voice over IP (High Definition) Video over IP
Video on demand Video conferencing Download
Data
Voice
Video
Internet
Multiservice Network
Packet-Based
Integrated Multiservice Networks—Data/Voice/Video
PBX
SNA
Multimedia via Data Networks
GSM/3G Mobile Telephony
Talsarunu tarifi (USD/min) VoIP un Lattelekom
SIP phones Basic SIP IP phones below $100 802.11 phones video phones Speakerphones PDAs with SIP software MAC, Unix, and MSoft.
Voice Quality Guidelines
Silence Suppression by Voice Activity Detection
Speech Silence Speech
No Cells
CellsCells CellsCells
Voice Activity Detection (VAD)
Fax over IP
H.323 MCU
Responsible for managing multipoint conferences (two or more endpoints engaged in a conference)
The MCU contains a Multipoint Controller (MC) that manages the call signaling may optionally have Multipoint Processors (MPs) to handle
media mixing, switching, or other media processing
Multisite Videoconferencing
MCU
Streaming server
rtspd
Quick-time
GatekeeperSIPUA
SIP
H.323
RTSP
sipd
sipconfsipconf
sipumsipum
sip323sip323SIP-H.323
signaling gateway
Conferencing
Programmable SIP servers
Unified messaging
Streaming media
Hardware SIP phone
Desktop SIP clients
sipgwsipgw
PSTN
MGCPSIP-MGCP gateway
SIP-PSTN gateway
Regular telephones
A Integrated SIP Service System
ENUM example: Voice
Telekom PSTN Switch
nic.at43.at
1. +43 780 123456
6.5.4.3.2.1.0.8.7.3.4.e164.arpa
4. sip:[email protected]
5. INVITE sip:[email protected]
PSTN-IP Gateway
2. +43 780.*
DNS
6. INVITE sip:[email protected]
PSTN Internet
ENUM example: SMS delivery
MO SMS Center
nic.at43.at
6.5.4.3.2.1.0.8.7.3.4.e164.arpa
4. sip:[email protected]
5. MESSAGE sip:[email protected]
at43 SMPPServer
2. SMS via SMPP
DNS
6. MESSAGE sip:[email protected]
PSTN Internet
1. SMS an +43 780 123456
cross-domain call ENUM
nic .at43.at fwd.pulver.com
ENUM DNS
SIP server
SIP server
sip:[email protected] sip:[email protected] sip:[email protected]
+878106242237537
session
IN NAPTR 7.3.5.7.3.2.2.4.2.6.0.1.8.7.8.e164.arpa. ?
... NAPTR ... "!^.*!sip:[email protected]!"
DNS SRV lookupfwd.pulver.com
PSTN
Internet
ENUM
DNS
AsteriskLinux PBX
AsteriskLinux PBX
PBX
PBX2PBX using ENUM
PCM or SIP or IAX or H.323
+421257296666
IN NAPTR 6.6.6.6.9.2.7.5.2.1.2.4e164.arpa. ?
... NAPTR ... "!\\+421257296(.*)$!sip:2\\[email protected]!"
PCM or SIP or IAX or H.323
EN
UM
+442079025500
+442079025500
Skype
Based on Kazaa Overlay network Unstructured p2p file sharing overlay Overlay p2p network consisting of ordinary and
Super Nodes (SN). Ordinary node connects to network through a
Super Node. Centralized authentication server Excellent Audio quality based on Internet Low
Bit rate Codec ILBC (http://rfc3951.x42.com/)
iLBC – MOS (Audio Quality) behavior versus percentage packet loss
Skype Skype client listens on configured TCP and UDP ports. Uses a variant of STUN to identify the type of NAT and
firewall. Usage of TCP port 80 enables client to reach super node
even through firewalls. Call signaling is done over TCP, messages are preferably
transported over UDP. In the presence of NAT or firewalls, calls between caller
and callee are routed by an intermediate node All Skype messages are encrypted.
HD Video resolution
HD video sizeHD video size1920
1080
1080i HD1080
1440 HDV
720
1280720p HD
704
576
4CIF/FullD1 (SD)
352
288
CIF (SD)
320
240
digvid
1.2 High Quality Digital Video Technologies
Resolution Bandwidth Delay
HDTV
Uncompressed
1080i (1920x1080 30fps)
720p(1280x720 60fps)
1~1.5Gbps 100msec
MPEG2 20~80Mbps 1~2 sec
H.264 10Mbps 2~3 sec
SDTV
Uncompressed
480i(720x480 30fps)
250Mbps 100msec
DV 30Mbps ~300msec
MPEG2 5~6Mbps 1~2 sec
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Video Streaming Over the Network
WMV1.5Mbps 25Mbps
5Mbps
50Mbps
100Mbps
1Gbps
10Gbps
HD
DVMPEG4
MPEG1
DVD
H.261
128Kbps
MPEG2
SD
QHD
Bandwidth
10Mbps
H.263
Lab Tests
Centaurus
10 GigE
Centaurus
10 GigE
UltraGrid Sender
UltraGrid Receiver
LDK-6000PDP-
502MX
1.485 Gbps
RTP/UDP/IP
SMPTE 292M SMPTE 292M
Back-2-back tests: Video: 720p Duration: 10 min RTT: 70 µs MTU: 8800 bytes
Results: No loss or reordering 1198.03 Mbps throughput Total 10,178,098 packets
sent and received
HDV over IP system
MPEG-2 TS
IP Network
PacketizerPacketizer and MPEG2 Decoder
Sender Receiver
TS Packets …
…RTP Packets
HD Camcorder
IEEE1394Interface
HD Display
…
…
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i2CAT experiences with HD
2001 Open Opera Live transmission of an Opera (La Traviata) from Liceu Opera House to a cinema both
in Barcelona to compare spectators feelings. After several tests with experts, we concluded that the only acceptable quality was
uncompressed high definition
i2CATMedia
Gateway
HDSDI
SD
I MPEG2(10 Mbps )
CINESA Diagonal
UNIVERSITIES (UPC, UdG, UdL)IP Multicast
HDSDI (1,5 Gbps )
Liceu Opera House
Video Packetization and IP Transport
RTP packetization is based on: ``RTP Payload Format for Uncompressed Video’’, RFC 4175 Ladan Gharai and Colin Perkins
RFC 4175 covers packetization of various video formats: Supports range of formats including standard & high definition video Interlaced and progressive RGB, RGBA, BGR, BGRA, YUV Various color sub-sampling: 4:4:4, 4:2:2, 4:2:0, 4:1:1
RTP
RFC 1889: RTP: A Transport Protocol for Real-Time Applications
RFC 2250: RTP Payload format for MPEG1/MPEG2 Video RTP Payload contain integral number of MPEG
transport packet (188byte). Suggest several MPEG picture fragmentation rules. RTP Header fields for MPEG2 Video
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