|Windows 7 and Vista Recording Input Source selections for recording streaming audio, sound from media players or just about anything you can hear coming through your speakers are Hidden from view and Disabled by Default.
If your sound card/system supports recording streaming audio Input Source selections such as: Stereo Mix or a similar selection, here's what you need to do to Enable it for recording:
Right-Click on your Speaker Icon in your System Tray, (near your clock), select "Recording Devices".
(You can also access these settings via Control Panel, Hardware and Sound, Sound).
In the Sound window that opens, near the top, select the "Recording" TAB.
Move your cursor down to where devices are shown.
Right-Click in the blank white area and select "Show Disabled Devices".
If supported, new selections will appear such as: Stereo Mix, etc. Right-Click on "Stereo Mix", or similar and select "Enable".
Right-Click on the same item again and select "Set as Default Device". Click OK.
Now in Easy Screen Capture Video under Audio Options in the "Audio Capture Device" box, you should have the "Stereo Mix", or similar source available to select for recording streaming, etc.
(You can also Enable other hidden selections like Microphone, Line In, etc. if they are not already shown).
If the "Stereo Mix" type device did Not show up in the "Sound" window when right-clicking and selecting Show Disabled Devices, it may indicate that you have Integrated Sound, and recording streaming, etc. is Not supported. In that case (on a Desktop PC), installing a sound card into an available slot should solve the problem.