high performance video transmission technology svftp (swift video file transmission protocol) kddi...
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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
23/04/19 KDDI R&D Laboratories Inc. 4
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
23/04/19 KDDI R&D Laboratories Inc. 5
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
23/04/19 KDDI R&D Laboratories Inc. 6
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
23/04/19 KDDI R&D Laboratories Inc. 7
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
23/04/19 KDDI R&D Laboratories Inc. 8
Demonstration
Client< Receiver >
Sever< Transmitter >
< Network emulator >
Data (650Mbyte)
Network environments- Round trip delay 1) 0msec 2) 10msec 3) 150msec
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