# Record a series of videos, then acquire a series of trials

Aim

To record a number of video files while the tests are carried out. Video tracking is done in a later phase.

important With this method, Trial Control is not applied during video recording. This means that for example you cannot stop video recording automatically after 10 minutes. To stop video recording, do so manually (see below). Trial Control is applied in the second phase (acquire trial).

Prerequisites

1.For general recommendations, see Acquire a series of trials - live.

2.Choose Acquisition > Open Acquisition. In the Acquisition Settings window, select Save video only, track later.

3.If no trials are planned, click the New trial button in the Playback Control window.

Procedure

Record a series of video files

1.Choose Acquisition > Start Trial, or press Ctrl+F5, or click the Start trial button in the Playback Control window.

The Video window says Recording video.

2.Release the animal in the arena.

3.To stop video recording, choose Acquisition > Stop Trial, or press Ctrl+F6, or click the Stop trial button in the Playback Control window.

Repeat the procedure for more video files.

Acquire a series of trials from the video files

1.In the Acquisition Settings window, select Track all saved video files.

2.Make sure that the video file is positioned at its beginning or, in any case, at the point where you want to start data acquisition.

optional Select Detection determines speed in the Playback Control window to make sure that samples are not missed. See DDS (Detection determines speed) for the advantages of applying this option.

3.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.

4.Acquisition stops automatically when the video file has reached the end and EthoVision XT automatically proceeds with the next saved video in your Trial List.

5.When all the videos have been analyzed, a message informs you that acquisition is done.

Notes

▪If you wish to discard the tracks and re-do tracking from that video, see Redo a trial.

▪To make sure that tracking starts and stops at the correct moment in the video, you must define appropriate Trial Control settings.