# Acquire a trial from a video file recorded with other programs

Aim

To carry out video tracking from a video file recorded with a program other than EthoVision XT.

Prerequisites

1.The video file is compatible with EthoVision XT. See Video file formats.

2.In the Experiment Settings, under Video Source, select From video file.

3.In the Arena Settings, Check the video aspect ratio.

4. optional Make a Trial List and add a video to each trial.

5.Choose Acquisition > Open Acquisition. If no trial is planned, to add a new trial, in the Playback control window click the New trial button or press Ctrl+F3.

To acquire a trial from a video file

1.In the Acquisition Settings window select Track next planned trial.

2.in the Acquisition Settings window, under Settings click the Video button.

Select the video file you require. To have files of all formats listed, select All files from the Files of type list.

3.Position the video at the point you require.

4.Select DDS in the Playback Control window to make sure that samples are not missed. See DDS (Detection determines speed) for more information.

5.To start the trial, choose Acquisition > Start Trial, or press Ctrl+F5, or click the Start trial button in the Playback Control window.

The video is played forward and tracking takes place.

6. Acquisition stops automatically when the video file has reached the end, or when the condition before the Start track box in the Trial Control rule is met, or when you choose Acquisition > Stop Trial, or press Ctrl+F6, or click the Stop trial button.

What next?

▪If you need to enter values of independent variables, click the Independent Variables tab in the Analysis Results and Scoring pane. Edit the values where needed.

▪You cannot Redo a trial obtained with this acquisition method.