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Author:Lu, Shengye
Title:Real-time media streaming over challenged networks
Publication type:Master's thesis
Publication year:2011
Pages:[9] + 74      Language:   eng
Department/School:Tietotekniikan laitos
Main subject:Tietokoneverkot   (T-110)
Supervisor:Ylä-Jääski, Antti
Instructor:Ott, Jörg
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto     | Archive
Keywords:RTSP/RTP streaming
proxy
caching
CHIANTI
SOCKS
DTN
Abstract (eng): Real-time media streaming is one of today's popular Internet applications.
This application can yield satisfactory performance only under certain Quality of Service (QoS) provisions.
In challenged networks - e.g., mobile wireless networks, which are characterized by intermittent connectivity, unpredictable delays and high error rates - it is very difficult for media streaming applications to achieve satisfactory performance.
In this thesis, we focus on RTSPIRTP streaming, and present an approach to enable RTSP/RTP streaming to accomplish smooth play back over challenged networks.

We develop a performance enhancement proxy (PEP) to work in conjunction with CHIANTI infrastructure.
While CHIANTI infrastructure takes care of transmitting application data reliably without loss, our proxy is trying to diminish the resulting long delay by performing "caching and pre-fetching" operation.
The proxy consists of two parts - the client module and the server module.
The server module retrieves more media data than those needed for real-time playback, and forwards them to the client module; the client module keeps those media data in a local cache, and then streams them to the media client at ordinary rate.
The extra media data cached ahead of schedule can bridge the long delay caused by network interruptions.

The practical contribution of this thesis is a multi-purpose RTSP/RTP proxy application.
The application implements the above PEP.
It relays and modifies RTSP messages, retrieves and caches RTP packets, and then streams them towards the media player according to flexible speed and schedule.
In addition, our application implements built in SOCKS proxies in order to allow the PEP function as CHIANTI Chain Modules.
The application can also be configured to operate over a DTN overlay network.
ED:2011-02-18
INSSI record number: 41533
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