Capture Video Based On Instant Messaging Applications And Research

Instant Messaging is currently the most popular way to communicate on the Internet, by the way various Instant Messaging software have been continuously appearing; service provider offers more and more communication services nowadays. As the development of the Internet, Instant Messaging will perform a wider use .With the higher demand for Instant Messaging, People want video as well as sound. So video capture technique is an important point and key prerequisite in these applications. Windows operating system supplies a few kinds of video capture techniques, which mainly includes Video for Windows based on MCI(Multimedia Control Interface) and DirectShow.Video for Windows (VFW) The first video capture and display system developed by Microsoft for the Windows operating system. The design of VFW video capture was optimized for capturing data to disk.Microsoft DirectShow is an architecture for streaming media on the Microsoft Windows platform. DirectShow provides for high-quality capture and playback of multimedia streams. It supports capture date using Windows Driver Model (WDM) devices. It supports a wide variety of formats, including ASF, MPEG, AVI, MP3, and WAV sound files and so on. DirectShow is based on the Component Object Model (COM). You can also create your own DirectShow components to support new formats.In this thesis, the author mainly do study on the technical. Architecture of Video for Windows firstly, and it analyses the realized mechanism of its function module AVICap used for video capture. With its technique the author provide the workflow and key steps of realizing video capture. Based on research upwards; the author analyses the advantage and disadvantage of VFW. Then the author do more research on technical architecture of DirectShow...