Camtasia error :video codec open failed

Open Camtasia9.0 and click record. Click the red record button in the upper left corner to adjust the recording area. When clicking the ammonium button of “REC”, a dialog box popped up, indicating “Error occurred in Recorder: Video Codec Open Failed”.
After a reason to find the final solution, just download three decoder installation on the official website can be. Share this with others who are experiencing these problems.

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