QGroundControl supports recording the video stream directly to the receiving device. If you would like to record your video with the QGroundControl application elements displayed, you should use a separate screen recording software. The video is saved under the path selected in the General tab of the Application Settings page. The default path is User/Documents/QGroundControl.
To record video in QGroundControl, click the red circle in the lower right-hand corner of the video window. The red video recording icon is a square when QGroundControl is currently recording the video stream to a file. When QGroundControl is not recording video, the red video recording icon is a circle. Each time the red circle is clicked to start recording, a new video file is created. The videos are saved in Matroska format (.mkv) by default. Matroska was chosen because it is robust against corruption in case of errors. Other formats are supported and can be selected on the General tab of the Application Settings page. If you would like to use your video in another format, you must convert the .mkv file with a transcoding program like VLC.
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