high performance video transmission technology svftp (swift video file transmission protocol) kddi...
TRANSCRIPT
High performance video transmission High performance video transmission technologytechnology
SVFTP (Swift Video File Transmission SVFTP (Swift Video File Transmission Protocol)Protocol)
KDDI R&D Laboratories Inc.
23/04/19 KDDI R&D Laboratories Inc. 2
Background
Professional user’s requirement for video transmission over IP networks• High-quality image• High-speed transmission
The existing data transmission protocol• RTP (UDP type): Audio and video streaming• FTP (using TCP): File transfer
23/04/19 KDDI R&D Laboratories Inc. 3
Issues
Issues of typical data transmission protocol• UDP: No guarantee of packet arrival
• TCP: Throughput performance degradation due to network environment
Impact on image quality
Impact on transmission speed
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Concept of SVFTP
Advantage1) High speed 4) Live transmission
2) High reliability 5) User authentication
3) Functionality
Multi-connection (TCP/IP based)
<Transmitter>
buffering
<Receiver>
Reassembling and buffering
Encode
r Decode
r
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Throughput characteristics over wireless LAN (2Mbit/s)Throughput characteristics over wireless LAN (2Mbit/s)
0
0.2
0.4
0.6
0.8
1
1.2
1.E- 04 1.E- 03 1.E- 02 1.E- 01Packet loss rate
Thr
ough
put
(Mbi
t/s) FTP CN=1
CN=2 CN=3
200msec round trip delay and x% packet loss
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Actual performance of long-distance communication (800km)Actual performance of long-distance communication (800km)
0
1020
3040
50
6070
8090
100
0 2 4 6 8 10
Connection Number
Thr
ough
put
(Mbi
t/s)
ftp
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Our product using SVFTP
VistaFinder• Store & Forward News Gathering System
VistaFinder Bx
Camcoder
IP networkCable: ADSL, FTTH
Wireless: 3G mobile phone, InmarsatM4
transmitter receiver
VistaFinder Rx
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Demonstration
Client< Receiver >
Sever< Transmitter >
< Network emulator >
Data (650Mbyte)
Network environments- Round trip delay 1) 0msec 2) 10msec 3) 150msec