Video source

This tab is used to define the source of the videos used by the tests.

You can choose a webcam to record videos with Ethotrack or use video files present on your computer.

webcam:

Source :

The drop-down list allows you to choose the camera that will be used to record the videos.

This list displays the cameras connected to the computer, but also those known to Ethotrack, even if they are not physically connected to the computer.
Click to refresh the list of available cameras.

	Dimensions :
	This drop-down list allows you to choose the dimensions of the image. This list depends on the selected camera.

Number of images / sec. max :

This drop-down list allows you to choose the maximum recording frequency (ie the number of frames per second) of the video. Actual video recording rate may be lower as it depends on many parameters:

•The characteristics of the webcam : if the camera does not support the desired frequency, it will use the nearest supported value.

•The recording conditions (especially brightness) : if the brightness is too low, the camera will automatically reduce the frame rate to increase the exposure time.

•The characteristics of the computer used.

The actual frame rate provided by the camera is shown at the top right of the image before you start recording :

A pictogram also indicates whether this value is correct or too low compared to the desired value :

• : the frame rate is less than half the desired value.

• : the frame rate is between half and 3/4 of the desired value.

• : the frame rate is greater than 3/4 of the desired value.

A frame rate of 10 images per second iso, in general, sufficient to have good precision and makes it possible to limit the size of the video file.

Allow the use of videos of different sizes :

Normally, it is preferable that all the videos of the same protocol are recorded under the same conditions with identical characteristics. By default, Ethotrack does not allow to associate with a test, a video whose image does not have the same dimension as that of the protocol. If some videos were recorded by mistake with a different frame size and you still want to use them check this box to remove this limitation.

Import an image :

Click this button to create a " saved image " from a file.

For more details, please consult the " Saved image " section.

	Saved image :
	Click this button to record an image from the webcam or to view the image already recorded. This allows the protocol to be changed later, even if the webcam is no longer connected to the computer.

The larger the image size and the larger the recording frequency, the larger the video file size will be. Normally a recording frequency of 10 frames per second provides sufficient precision while limiting the size of the video file.

Even if you choose a webcam as the video source for the protocol, it is still possible to use a file recorded by another application as the video source for a test.

Video files:

	Select :
	Click this button to select a video file or an image file from your computer.

Allow the use of videos of different sizes :

Normally, it is preferable that all the videos of the same protocol are recorded under the same conditions with identical characteristics. By default, Ethotrack does not allow to associate with a test, a video whose image does not have the same dimension as that of the protocol. If some videos were recorded by mistake with a different frame size and you still want to use them check this box to remove this limitation.