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Using CamStudio with ScreenPressor Codec

Step 1. Install ScreenPressor and CamStudio

To record video from screen you need a screen capturing application and a video codec to compress the video. CamStudio is a free program for screen recording. It has its own codec but it creates very big files, using ScreenPressor allows you to make the video files 10-20 times smaller without losing a bit of quality (ScreenPressor is a lossless codec).

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Download CamStudio (free)

After installing CamStudio open its folder and rename Player.exe to Playplus.exe (removing the old one). There are two players coming with CamStudio and by default it uses Playplus.exe which is buggy. Replacing it with Player.exe solves the problem. This player is used only when CamStudio shows you the video you've just recorded. Later you can watch your video with any video player.

Step 2. Set video options

You only need to tweak the options once, CamStudio will remember them and you won't have to worry about them every time.

Launch CamStudio, from the main menu, choose Options -> Video Options


Select "Infognition ScreenPressor".


This setting is for lossy codecs and doesn't affect lossless codecs like ScreenPressor. Anyway it's good to keep it at 100.

Set Key Frames Every

Recommended setting is 1 keyframe every 200 frames.

Clear "Auto Adjust" checkbox to enable manual framerate selection.

Capture Frames Every

This field determines the input frame rate. It dictates how long the CamStudio will "sleep" after capturing each frame. One millisecond is 1/1000 of a second.

If you set this to a large value (for example 1 hour, or 3,600,000 milliseconds), you practically create a time-lapse movie. CamStudio will actually "sit and watch" for activities on the screen that takes a long time to occur and take a snapshot (say, only once every hour).

Recommended rate is 10 frames per second, it's smooth enough to see what happens, leads to small file size and close to the speed CamStudio is capable of capturing screen.

For 10 fps capture, set this value to 100.

Playback Rate 

This field determines the output frame rate per second. A higher value means a smoother playback.
Typical values of 10 – 20 frames per seconds are adequate for most purposes.


Click this button to configure the parameters of selected compressor.

Maximum interval between key frames setting should be set at 200.

Step 3. Start recording

 To start recording, click the red button. A rectangle will appear for you to select the area you want to record.

 When you want to stop recording, click the blue stop button. A dialog will appear for you to name and save the file.

 To pause a recording to adjust your screen, click the pause button. You can resume recording by clicking on the record button again.

Step 4. Setting Regions

From the main menu, choose Regions -> Region or Fixed Region or Full Screen

You should set the Input Region before recording. This allows you to define the area and type of video capture. From the main menu, chooseRegion

There are 3 types of regions you can choose:

1) Region

Before recording starts, you can define an arbitrary rectangular region with the mouse. The cursor turns into a pen on cross-hairs, which you use to define a rectangular region on your screen by click-dragging the left mouse button.

2) Fixed Region...

You can capture a fixed-size rectangular region. A dialog allows you to define the size of the region in pixels.

  • If the Fixed Top-Left Corner checkbox is not selected.

Before the recording starts, you can move the fixed-size region around the screen to determine where you want the input area to be. To cancel recording, you can click the right mouse button.

  • If the Fixed Top-Left Corner checkbox is selected.

Recording will start immediately when the Record Button  is clicked. The region of capture is specified by the Left, Top, Width and Height values of the dialog above.

  • If the Drag Corners to Pan checkbox is selected, you can drag either one of the four corners of the recording region (indicated by the flashing rectangle) with your mouse during recording. The mouse cursor will change to a four-pointed arrow when it is over one of the corners. When this happens, click and drag the region to the new location.

3) Screen

The entire computer screen is captured.

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