gadgets hence satisfying in the needs of future generations. So in all Virtual Classroom is a must have
application for the students who prefer better utilization of resources in an efficient manner.
II. LITERATURE STUDIES
In the present scenario there is considerable development in the accessibility of resources. The information
sharing and internet facilities have embarked their presence in the current prospective WiFi , a type of
IEEE 802.11 WLAN (Wireless Local Area Network) that is a name for WiFi Fidelity defined by WiFi 
Alliances. It is designed for cable replacement in corporate environment, providing IP connectivity.
Android  is an operating system that runs on top of Linux kernel with a custom JVM set on top of it. It
allows only JAVA  applications to be installed. It shows better performance compared to Sun embedded
JVM without JIT because of bionic libc and better VM design. It is developed in C, C++ language.
Video Coding  deals with the compression of image to that of being most ubiquitous resource activity for
the audience to learn about coding standards without having to plough through formal documentation .Basic
stress is given on video generalization, digitalization and formats. A major video codec that we have used in
“Virtual Classroom” is H.264 . It is a latest video coding standard of ITU-T Video Coding Experts Group
and ISO/IEC Moving Picture Experts Group. Scope of Video coding standardization is shown in Fig 1.
Fig.1: Scope of Video Coding Standardization 
XML Parsing  starts with character conversion followed by lexical analysis that is invariant among
different parsing models with syntactic analysis creates data representation based on parsing model used.
Using xml parsing in “Virtual Classroom” we have included the streaming capability feature. It requires low
latency and memory usage and usually parses a small portion of document sequentially without having full
fledged information of entire document structure.
Video Streaming  in android is divided into five layers, including the user interface, data capture and data
output codec and network transmission layer. With this the cycle and complexity of media application cycle
gets reduced and hence improves overall software maintainability. This development was meant to enhance
the stability and provide portability to the various android based applications.
III. PROPOSED METHOD
Android  operating system is defined as an open source system developed by Google in Linux platform
using C, C++ and JAVA  language. In “Virtual classroom” we have proposed an android version of 2.2.
Basic implementation of the application comprises of the following desired tasks. Starting with the feature
that is the basic idea for the application prototype is video streaming from the server which is at the same
network of android mobile client. Next is the subtopics task to provide easiness and is potent in viewing the
video lecture. When a user feels tired or exhausted while viewing the lecture he/she can pause at that moment
and record the timeline so that whenever the video is buffered it starts from the last saved timeline, this
feature is called bookmark. Its updating is also possible from application context. Moreover if a user is not
comfortable in understanding English then an option called subtitle is provided to adjust it according to the
preferable language. And the latest feature that is imposed is based on multiple video format support in
android  mobile device. Our proposed software is the solution for the problem discussed above .Basic
implementation of this software can be summarized in following lines. Basically after installing the android
application connect with the same network through which server is connected. On server video, lectures and
xml files and subtitles files are stored. When you first start the application it will ask for the IP of server and
connection will be created with server. Now in android client list of the video lectures will be displayed. User
can select any of the video lectures that are played and XML  file corresponding to that video lectures will
be parsed and you can view the subtopics in a list view. Also there are additional features like bookmarking
and play with subtitle. In bookmarking feature user can save timing of video lecture along with its complete
URL. These timings are stored on SQLITE  database and retrieved again. Another feature is playing
subtitle along with video in different regional languages, this enhances better understand ability of concepts.
The tasks are developed using the tools like Eclipse, Android , XML Parsing, External Storage, SQL Lite
Database, Wi-Fi and JAVA  language.
IV. TEST RESULTS
Application was tested on Samsung Galaxy S5360Y.All the operations can be summarized as in the
TABLE I: TESTING RESULTS
ID Test Description Test Result Check
1 Installing .apk file Installation successful 1
2 Launch+WI-Fi Check Prompt user if Wi-Fi disabled 1
3 Launching Time Valid connection with server. 1
4 Subtitle check Loads subtitle if exists 1
5 Subtopics Xml is loaded + topics displayed 1
6 Bookmark Video buffered from last bookmark 1
Fig.2:Data Flow Diagram
Using the Data Flow Diagram Fig.2 all its respective features are presented .The diagrammatical description
starts from user perspective where a user starts in either from Wi-Fi  connectivity or through SD card
 .On successful connection video list is displayed in the mobile device. The next depiction of Data Flow
Diagram indicates in that selected video is being played and its XML  is loaded in to the device and it can
be activated using sliding drawer where all the topics are indexed. Additional option are provided to subtitle
in the a particular video and hence a user is allowed to bookmark and also update in a particular video by
saving in current timeline and then resuming the video in case a user wants to continue from the last
bookmarked position. At the end of Data Flow Diagram Fig.2 a user adds in the bookmark in SQLITE 
database and that particular timestamp is recorded and hence saved in when video is again processed.
The motive of data Flow Diagram is to provide in clear view in the minds of user who access in the
application for first time. The one sided arrows indicates that the process is irreversible and the circle
indicates that it is a process while open rectangular block signifies that it is a storage whereas closed
rectangle is a user. All the testing results are shown in Table 1.
Education is the most expensive and proposed portal in the current scenario. It makes a person literate and
gives him/her knowledge to learn the basic needs of life. So taking all these things in mind an android
application “Virtual Classroom” is developed to dynamically load /stream the video lectures just by making a
secure Wi-Fi connection with the available local server .Some of the inbuilt features in the application are-
Bookmark feature that helps in pausing the lecture and marking a timestamp so that whenever it is
again started, buffers from the last modified time.
Subtitles (.srt files) allow a user to view the lecture in his/her preferred language.
There is one option to store the important lectures in the SD card , in case there is loss of Wi-Fi
Bookmark updating feature.
Supports video formats like 3GPP, MPEG-4
Virtual Classroom would definitely provide new revolution in our education system scenario. The portability
it provides is beneficial from student’s point of view. The feature it has makes it a better education tool for
In this paper we have stated the utility of the application “Virtual Classroom” that would certainly define the
future perspective of the education in society. The methods that are being implicated are useful for learning
and saving time and effort.
The application provides a real time streaming of video and is portable so the range within which one can
operate is reasonable.
Finally we can conclude that the use of this application will embark a true mark in the education society and
then learning would be affordable to distances.
VII. FUTURE DIRECTION
Virtual Classroom not only creates an interactive environment but also save their time and enhance the mode
of portability by enabling a user with the proposed features. So taking its compatibility in mind there are
some future perspective to improve the overall performance.
Audio Dubbing in different languages in order to view lecture in regional languages.
Support of all video formats on android mobile client.
Adjusting the video quality and aspect ratio according to network strength.
User can adjust the speed of the buffered video lecture according to the need.
Shows the list of related video lecture at the end of current video lecture.
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