I have also tried Camtasia and liked it! I really dont know what you find wrong with the trail... i mean after you get 30 days most people just uninstall then reinstall or you can switch your computer clock backward... or forward..
BUT it is wrong for the developers and you wont support them if you do that so i suggest you try Screen Recorder it is the next best thing..
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This article provides a step-by-step explanation of how to make a good screen recording, using My Screen Recorder, from planning to actual recording.
Planning your presentation
The first step is to have a plan for your screen recording session. To start with, you need to decide whether you want to add voice narration while recording or to record the sound played by the application.
If you're going to record a voice-over narration, it is always a good idea to have some sort of script, so that you can maintain a steady voice and pace while you record. This script can also contain a list of actions (like opening particular windows), so you don't miss recording something important. You can pause and resume the recording at anytime by using the F8 shortcut key. It is a good idea to use a friendly tone of voice, even for corporate presentations.
When you want to record the audio from the application itself, set up the audio in the following manner:
1. In My Screen Recorder, on the toolbar click on Settings and select Audio.
My Screen Recorder - Settings Menu
2. Click on the Configure button.
My Screen Recorder - Audio Settings Tab
3. To record the application's audio, select Record from speakers. Click on Auto Select to let My Screen Recorder choose the best line for you. While using Auto Select, we recommended that you disconnect the microphone. To choose manually, select the Let me select the line option. Click OK when you have done this, and then OK again to close the Options window.
It is especially important to adjust the audio settings when you are recording media players or other interactive software.
Preparing to record
To get high quality screen recordings, you need to optimize the settings of My Screen Recorder:
1. You first need to decide what screen resolution to record at. High resolution recordings played back at lower screen resolutions result in image distortion. It is generally best to determine the lowest screen resolution that your recording will be played back at, and record at slightly less than that resolution. You can change your PC's screen resolution by right-clicking on the Windows desktop and then selecting Properties > Settings. Under the Settings tab, you can lower the resolution by moving the 'Screen resolution' slider to the left. If you want to increase the resolution, move the slider to the right.
2. The next step is to decide the recording size. If you want to capture only specific parts of your screen, click on the Region button on the tool bar, then choose either the Fixed Dimensions or Rectangle option. This reduces the file size of the recorded video.
My Screen Recorder - Region Selection
3. My Screen Recorder records the video in AVI format, which can be edited easily. However, uncompressed AVI files are very large so your recordings need to be compressed. Go to Tools menu > Settings > Video tab and select a Compressor. (Generally the default compression settings are fine.) Frame rate and Key Frame rate values also affect the file size and can be changed. If you are using My Screen Recorder Pro, you can also convert your AVI file to Windows Media Format. Windows Media files are much smaller, and can be streamed from a specialized web server (such as Video Desk).
good recording
Frame Rate is the number of frames to record per second. You can make it higher if you want smoother playback, especially for videos containing a lot of motion. However, higher frame rates also result in bigger files.
Key Frame Rate controls how often "full frames" are stored in an AVI file. A higher key frame rate can make it easier to "seek" within a video file, but it also increases the file size. The default settings of the frame rate and the key frame rate are optimum for most types of recordings, but you may try experimenting with these settings for better results.
4. For smoother recordings, especially of applications having fast action motion or media players, disable hardware acceleration by clicking on the Performance tab in the Settings window and then checking the option "Disable hardware acceleration" during recording.
Start Recording your Screen Activity
1. In My Screen Recorder, click the Record button on the toolbar to launch the Recording Options window. Please note the keyboard shortcuts for record (F8, by default), stop (F9 by default) and cancel (F10 by default). Check the option Pause before recording starts. Uncheck the Record audio while recording video box if you don't want to record audio. Click on OK.
2. Launch the application you would like to record. To start recording, press F8 on your keyboard. Now, perform the actions you want to document. My Screen Recorder will record them in the background. To stop the recording, press the F9 key.