Click here to Skip to main content
13,355,292 members (61,410 online)
Click here to Skip to main content
Add your own
alternative version


146 bookmarked
Posted 24 Nov 2004

Capture Activities on Screen in a Movie

, 24 Nov 2004
Rate this:
Please Sign up or sign in to vote.
An article on how to capture activities on screen as a movie file using Microsoft Windows Media Encoder 9.

Sample Image - CaptureScreenAsVideo.jpg


bkniazi asked me a question on, about how to capture the activities going on on a machine as a movie. I found the question interesting, so looked for it, but could not find any good solution for it. Though, I found some software which do this kind of work. I found Windows Media Encoder 9 very interesting. While looking into it, I found its SDK and I started looking into it. It is quite interesting. So I made this small sample after looking into the API and seeing some samples.


You will be needing Windows Media Encoder 9 Series and SDK.

Using the code

Best thing about this API is that it is totally interface based. WMEncoder is the main class. Set its parameters and start the encoder to start encoding. Stop it to save in file.

Encoder = New WMEncoder

Create a Source Group named SG_1 in Encoder's Collection.

Dim SrcGrp As IWMEncSourceGroup2
Dim SrcGrpColl As IWMEncSourceGroupCollection
SrcGrpColl = Encoder.SourceGroupCollection
SrcGrp = SrcGrpColl.Add("SG_1")

Specify the input types for Video and Audio. Specify the screen capture plug-in to set up the video source.


Find the profile and set Encoder's group profile from all the profiles available.

ProColl = Encoder.ProfileCollection
lLength = ProColl.Count
For i = 0 To lLength - 1
    Pro = ProColl.Item(i)
    If Pro.Name = "Windows Media Video 8 for Local Area Network (384 Kbps)" Then
        SrcGrp.Profile = Pro
        Exit For
    End If

Specify header information of the Encoder. I.e., description or attributes.

Dim Descr As IWMEncDisplayInfo
Descr = Encoder.DisplayInfo
Descr.Author = "Armoghan Asif"
Descr.Copyright = "Copyright information"
Descr.Description = "Text description of encoded content"
Descr.Rating = "Rating information"
Descr.Title = "Title of encoded content"

' Add an attribute to the collection.
Dim Attr As IWMEncAttributes
Attr = Encoder.Attributes
Attr.Add("URL", "IP address")

You may do some cropping of the Encoder if required.

' Crop 2 pixels from each edge of the video image.
SrcVid.CroppingBottomMargin = 2
SrcVid.CroppingTopMargin = 2
SrcVid.CroppingLeftMargin = 2
SrcVid.CroppingRightMargin = 2

Specify the Local File as output. You may also set additional fields of the file, like size of file, seconds of file etc.

Dim File As IWMEncFile
File = Encoder.File
File.LocalFileName = "C:\OutputFile.avi"

Start the encoding process:

' Start the encoding process.

Stop the encoding process:

' Stop the encoding process.

Points of Interest

No fancy things are placed in the demo. It just illustrates the screen capture. It can be easily added in any existing application. Nothing else :)


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Armoghan Asif
Pakistan Pakistan
No Biography provided

You may also be interested in...

Comments and Discussions

GeneralMy vote of 1 Pin
Srinath G Nath24-Mar-10 20:43
memberSrinath G Nath24-Mar-10 20:43 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

Permalink | Advertise | Privacy | Terms of Use | Mobile
Web04 | 2.8.180111.1 | Last Updated 24 Nov 2004
Article Copyright 2004 by Armoghan Asif
Everything else Copyright © CodeProject, 1999-2018
Layout: fixed | fluid