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29 Jun 20043 min read 589.6K   18.8K   172   157
Peer to peer video conference application.


This application allows any 2 persons on the LAN/Intranet (possibly Internet too) to have video conference. There are several video conference applications existing today. Each has its own performance enhancement techniques. The major problem in video conference is that the size of video frames is too big for transmission. Hence the performance is based on the codec used for encoding and decoding the frame. I am using Fast h263 Encoder library which gives better compression rate at high speed. This application can also be used on the Internet with little modification.

Recording and Playing Audio

I have used the same RecordSound and PlaySound classes which I have used in my previous voice conference application. Here, I will provide a brief overview of how to use this RecordSound and PlaySound classes.

// Create and Start Recorder Thread 
record=new RecordSound(this); 

// Create and Start Player Thread 
play=new PlaySound1(this); 

// Start Recording 

// Start Playing 

// During audio recording , data will be available in OnSoundData 
// callback function of RecordSound class.Here you can place your 
// code to send the data to remote host... 

// To play the data received from the remote host 

// Stop Recording 

// Stop Playing 

// At last to Stop the Recording Thread 

// To stop playing thread... 

Video Capture

Video capture is done using VFW (Video For Windows) API. It provides support for capturing the video from web cam. VideoCapture.h and VideoCapture.cpp are the files which contain the code for complete video capture process.

Here are the brief details of how to use this class....

// Create instance of Class 
vidcap=new VideoCapture(); 

// This is later used to call display function of 
// main dialog class when the frame is captured... 

// This does lot of work including connecting to driver 
// and setting the desired video format. Return TRUE if 
// successfully connected to videocapture device. 

// If successfully connected then you can get BITMAPINFO 
// structure associated with video format. This is later 
// used for displaying the captured frame... 

// Now you can start the capture.... 

// Once capture started frames will arrive in callback function 
// "OnCaptureVideo" of VideoCapture class.Here you call display 
// function to display the frame. 

// To stop the capture 

// If your job is over....just destroy it.. 

If you do this much work, your code will compile well....but linker will trouble you. You must link the suitable libraries....

#pragma comment(lib,"vfw32") 
#pragma comment(lib,"winmm")

Displaying the Captured Video Frame

There are various methods and APIs for displaying the captured frame. You can use SetDIBitsToDevice() method to directly display the frame. But this is quite slow as it is based on Graphics Device Interface (GDI) functions. The better method is to use DrawDib API to draw the frame. The DrawDib functions provide high performance image-drawing capabilities for device-independent bitmaps (DIBs). DrawDib functions write directly to video memory, hence provide better performance.

Here is the brief view of how to use DrawDib API to display frame:

// Initialize DIB for drawing... 
HDRAWDIB hdib=::DrawDibOpen(); 

// Then call this function will suitable parameters.... 

// Now if you are ready with frame data just 
// invoke this function to display the frame 

// Finally termination... 

Encoder and Decoder Library


I have used fast h.263 encoder library for the encoding. This library was the modified version of Tmndecoder to make it more faster for real time encoding. I have converted this library from C to C++ so that it can be integrated into any Windows application easily. I have removed some of the unnecessary codes/files from the fast h263 library. Also moved definitions and declarations in their proper .h and .cpp files.

Brief view of usage of H263 Encoder library

// Initialize the compressor 
CParam cparams; 
cparams.format = CPARAM_QCIF; 

//If you need conversion from RGB24 to YUV420 then call this 

// Set up the callback function 
// OwnWriteFunction is the global function called 
// during encoding to return the encoded data... 
WriteByteFunction = OwnWriteFunction; 

// For compression data must be in YUV420 format... 
// Hence before compression invoke this method 

// Compress the frame..... 
cparams.inter = CPARAM_INTRA; 
cparams.Q_intra = 8;; // Data in YUV format... 
CompressFrame(&cparams, &bits); 

// You can get the compressed data from callback function 
// that you have registerd at the begining... 

// Finally terminate the encoder 
// ExitH263Encoder();


This is the modified version of tmndecoder (H.263 decoder). It was in ANSI C. I have converted it into C++ so that it can be integrated into any Windows application. I have removed some of the files which had display and file storing functions. I have removed the unnecessary code and also added some new files.

Original library dealt with files. It was not suitable to use for real time decoding. I have done some major changes so that it can be easily integrated into the application for real time decoding process. Now one can use this library for decoding H263 frames. This library is quite fast and gives better performance.

Usage of Decoder .....

//Initialize the decoder 

// Decompress the frame.... 
// > rgbdata must be large enough to hold the output data... 
// > decoder produces the image data in YUV420 format.After 
// decoding it is converted into RGB24 format... 

// Finaly terminate the decoder 

How to run the application

Copy the executable file into 2 different machines A & B which are on LAN. Run both the applications. From machine A (or B), select Connect menu item, and in the popup dialog box, enter the name or IP Address of the other host (B), and press Connect button. In the other machine (B), Accept/Reject dialog box will appear. Press Accept button. In the machine A, notification dialog box will get displayed. Press OK to begin the conference.

That's it....Enjoy......!!!


I likes to thank Paul Cheffers for his audio recording and playing sound classes. You are seeing this videonet application is because of Open Source libraries contributed by open minded persons. I am grateful to the developer Karl Lillevold of Tmndecoder and Roalt Aalmoes of h.263 fast encoder library for making it free.

If you have any queries or suggestions, please feel free to mail me at


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

Written By
Web Developer
India India
Nagareshwar is a security enthusiastic person involved in reverse engineering, vulnerability research, coding security tools etc. He spend most of the time in uncovering the secrets of computer world.

He holds 'Bachelor of Engineering' degree from National Institute of Technology of Karnataka, India. He had professional experience of 2.5 years in Novell. At Novell he was working on various security products including 'Novell Secure Login' and CASA.

For more details visit his website

Comments and Discussions

QuestionGood sound over short distances, bad sound over long distances. Pin
Peter Eugene Coleman18-Mar-18 8:17
Peter Eugene Coleman18-Mar-18 8:17 
QuestionHELP Pin
shaima'18-Sep-13 23:01
shaima'18-Sep-13 23:01 
QuestionC# Pin
zezo14979-Apr-13 15:47
zezo14979-Apr-13 15:47 
Questionbug in GetPic.cpp Pin
Peter Eugene Coleman16-Jan-13 0:19
Peter Eugene Coleman16-Jan-13 0:19 
GeneralERROR : MFC application stopped working Pin
fayyu.5u26-Nov-10 22:20
fayyu.5u26-Nov-10 22:20 
Generalcan't work on windows7 Pin
hzbinger19-Feb-10 20:35
hzbinger19-Feb-10 20:35 
GeneralRe: can't work on windows7 Pin
Phalgun2511-Apr-10 10:09
Phalgun2511-Apr-10 10:09 
QuestionCompile Error Pin
new_test_codeproject19-Jun-09 2:40
new_test_codeproject19-Jun-09 2:40 
AnswerRe: Compile Error Pin
frankcch12349-Sep-09 15:44
frankcch12349-Sep-09 15:44 
Questionh.263 compressed size of 1 frame?? Pin
k-guys28-Apr-09 17:58
k-guys28-Apr-09 17:58 
QuestionCan you help me saving the video conferencing Pin
nadine-bd30-Dec-08 0:14
nadine-bd30-Dec-08 0:14 
QuestionModification for Internet Pin
Angel Kafazov21-Nov-08 3:16
Angel Kafazov21-Nov-08 3:16 
AnswerRe: Modification for Internet Pin
Peter Eugene Coleman16-Jan-13 0:09
Peter Eugene Coleman16-Jan-13 0:09 
Generalmulti video conferencing Pin
ssribalamurugan3-Nov-08 2:33
ssribalamurugan3-Nov-08 2:33 
QuestionProblems resizing video Pin
Neil Ellerington1-Oct-08 13:07
Neil Ellerington1-Oct-08 13:07 
AnswerRe: Problems resizing video Pin
zhuchang0074-Aug-09 0:57
zhuchang0074-Aug-09 0:57 
QuestionCan I use it in an open source project? Pin
triplebit25-Aug-08 12:46
triplebit25-Aug-08 12:46 
GeneralI can't donwload the source code! Pin
Mohammad Dehghan19-Aug-08 5:03
Mohammad Dehghan19-Aug-08 5:03 
QuestionVS 2005 compiler error Pin
TouchdownsBundy30-Jul-08 2:04
TouchdownsBundy30-Jul-08 2:04 
AnswerRe: VS 2005 compiler error Pin
52yinjin13-Jul-10 16:45
52yinjin13-Jul-10 16:45 
Generaldecode H263 frame from 'output.263' file Pin
Damon__8330-Jun-08 4:32
Damon__8330-Jun-08 4:32 
GeneralThanks a lot. Pin
kevin7892-Jun-08 18:33
kevin7892-Jun-08 18:33 
Question[Message Deleted] Pin
nsh_enp17-Apr-08 0:11
nsh_enp17-Apr-08 0:11 
GeneralRe: May I use VideoNet for commercial purposes ? Pin
Thanks for all the fish25-Apr-08 10:07
Thanks for all the fish25-Apr-08 10:07 
GeneralYUV Display Pin
shiva shankar8-Apr-08 2:56
shiva shankar8-Apr-08 2:56 

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