Tutorials > Measurement tutorials > Video acquisition

To include the high speed video in DEWESoft, only few steps are necessary.

1.	After acquisition of the video file and the DEWESoft data, please copy the *.avi camera file to the directory where DEWESoft data file is located.

2.	Please rename the video file to this specification: xxxxx.cam0.avi

where xxxxx is the name of the DEWESoft file to be synchronized. If we have more video files, we can name them xxxx.cam0.avi, xxxx.cam1.avi and so on.

Video post synchronization - rename file

The picture above shows an example of what this looks like.

3.	After this, open DEWESoft and enter the Analysis mode.

Video post synchronisation - selecting file

Double click on file to open it and DEWESoft will recognize that this file has no synchronization information included and will ask to synchronize it manually.

It will automatically recognize how many frames are stored in the file. Please enter the correct Frame rate of the camera (sometimes the .avi files hold the correct values, but most of the times not). In the info field Video size, you will enter the video length in seconds .

Also enter how many pictures were taken before the video trigger - Pre trigger - occurred . You can enter it in frames, seconds or milliseconds .

Trigger time can initially be selected from trigger (so long as the storing of analog data has been triggered from the same trigger source) or in the relative time from start of measurement in seconds .

When finished, DEWESoft will go to the video screen to see the result of the synchronization and the recorder will show the video frame ticks aligned with the analog data.

You can go back and forth with the yellow cursor to observe the quality of the synchronization.

Analysis - Video post synchronization

If you need to realign the video, please select menu item Post sync. Here you can change the parameters. Also, there is the option to select start of video from the current position. In this case, the yellow cursor will be taken as the origin of synchronization.

In order to store the synchronization info for future post processing once you are done and satisfied don't forget to choose Save. Be careful, this can be done only once and since it is written into the original video file, it is recommended to keep a copy of the video.