On this tab, you can request and watch videos for the past period (playbacks) from the unit cameras and save the required excerpts as files.

Requesting a playback

To request a playback, follow the steps below.

1. In the Action section, select the Request and view playback option.
   
   
2. Enter or select the name of the unit from which you want to request the playback. The list shows units for which cameras are configured. If the device type does not support the function of watching playbacks, the unit is not available for selection and the icon   is displayed next to its name. The units that are offline are not available for selection either and are marked with the icon . 
3. Click on the icon  and select one or more cameras from which you want to receive the playback. 
   
   
4. Specify the date and the time period for which you want to request the playback. You can do this manually or using the calendar. In the calendar, the days on which fuel fillings and drains were detected are marked with an icon. The tooltip of the icon shows the first four events of the day and the time at which they were detected. If there were more than four, you can also the number of other fillings and drains.
   
   When specifying the period, consider the following:
   
   • You can specify a present or a past date. By default, the current date is selected.
   • The end time should not be earlier than the start time.
   • If the current date is specified, and the end time has not come yet, the playback is requested up to now.
5. Click Request.
   
   

When switching from the Video tab to another one before the playback is loaded, the system notifies you by means of a pop-up message as soon as it is loaded.

Watching a playback

The requested playback is displayed in the right part of the window. To watch it, click on the play icon or move the slider on the timeline. 

The timeline can be completely white or grey, or it can consist of white and grey segments. White means that no data is available for the time period, and grey means that a playback is available from at least one of the selected cameras.

On the timeline, you can see the fuel fillings and drains detected within this period. They are indicated with the markers  and , respectively. The tooltip of the marker shows the name of the event and the time at which it was detected. Click on the marker to watch the playback starting 10 seconds before the event.

When watching playbacks, the following functions are available:

Unit track on the map when watching playbacks

To open the map section, click on the icon   in the upper-right corner of the tab.

After you request the playback, the map shows the unit track for the period specified during the playback request. If the unit hasn’t sent any messages with location data within this period, the track is not displayed.

When you play the video, the unit moves along the track. The unit position on the track changes according to the location data from the unit messages received during the time the video was recorded. When you point to the unit icon or a track point, the tooltip shows information from the message received at that place.

For other particularities of working with the map, not related to tracks or units, see the Live stream page.

Saving a playback to files

You can save the required playback excerpt as a file. There are two ways to do this:

1. Using the icon  in the mode of watching the playback;
2. Using the Save requested file to Files option in the Action section.

The video quality of the saved excerpt depends on the device quality settings.

Method 1

To save a playback excerpt in the first way, request a playback using the instructions above and follow these steps:

1. Move the slider to the required place on the timeline or click on the marker of the necessary event to set the slider 10 seconds before this event was detected.
   
2. Click on the icon .
3. In the left part of the window, if necessary, clear the selection of the cameras that shouldn't be included in the file. If a camera doesn't have any data for the whole interval you want to save, its name becomes grey and this camera is not included in the file.
4. Specify the duration before and after the event in seconds. The minimum allowed value is 1, and the maximum value is 30. The duration of the file you want to save is equal to the sum of the specified values and is displayed above the timeline as a red segment. 
   
   
5. In the drop-down list, select the tag corresponding to the event from the excerpt. The default tag is None.
6. Click on the Save to files button. The button is inactive if there is no data from any camera for all the interval you want to save.
7. If you want to save one or several excerpts of the same playback, move the slider and repeat steps 3 – 5. To exit the file saving mode, click on the arrow. 

You can monitor the loading progress on the Files tab. The saved file is later available on the Files tab, in messages, and in reports.

Method 2

To save a playback excerpt in the second way, follow these steps:

1. Select the Save requested file to Files in the Action section.

2. Enter or select the name of the unit for which you want to save a playback excerpt. The list shows units for which cameras are configured. If the device type does not support the function of saving video files, the unit is not available for selection and the icon   is displayed next to its name. The units that are offline are not available for selection either and are marked with the icon . 
3. Select one or more cameras from which you want to save the video file. Use the Select all option to select or cancel the selection of all cameras at the same time.
4. In the Event time field, enter the date and time of the event (to the nearest second) from the excerpt you want to save.  You can do this manually or using the calendar. In the calendar, the days on which fuel fillings and drains were detected are marked with an icon. The tooltip of the icon shows the first four events of the day and the time at which they were detected. If there were more than four, you can also the number of other fillings and drains.

5. Specify the duration before and after the event in seconds. The minimum allowed value is 1, and the maximum value is 30. The duration of the file you want to save is equal to the sum of the specified values.

6. Click Request.

The requested excerpt is saved only if the playback for the specified period is available on at least one of the selected cameras.

You can monitor the loading progress on the Files tab. The saved file is later available on the Files tab, in messages, and in reports.

If the excerpt you are saving contains intervals with no data from all the cameras, the number and duration of the saved files is equal to the number and duration of intervals with available data.

In addition to the manual saving, you can configure the automatic saving of files in Wialon. To do this, create a notification with the Save a video as a file action.