How frame drop test is executed using PQA in TestStand ?

Can someone shed some light on the frame drop test which is executed using PQA in TestStand ? Also, what is the use of reference stream and trigger in the frame drop test ?
According to the manual, the Dropped Frame processor computes the difference in pixels between consecutive frames. So, in this scenario, how does the processor compare the framedrop of the test stream with reference stream (if any).
Thanks

Hello Enigma123
The Dropped Frames processor returns a metric that is the average of the absolute difference between each pixel in a frame compared to its following frame. Depending on scene transitions or a known video playback performance, you can use this processor to determine if you are missing frames. For example, imagine two 3x3 images
2 2 2           1 1 1
2 2 2     &    1 1 1
2 2 2           1 1 1
The average difference between these frames is 1. A media reference stream is not used with this processor when it runs. However, and I always recommend doing this for unreferenced tests, a data reference can be created from a reference stream to compare with future tests results. The data reference is a calcuated set of metrics that corresponds with a given PQA acquisition/processes or a set thereof.
Here is the process I would take for unreferenced tests.
Take a reference video that you know plays back properly.
Set that you wish to create a data reference, acquire that video/audio stream and perform and activate the desired processors.
Now, select that you would like to use that data reference for future acquisitions.
Perform new acquisitions using the same processors and observe the new results stream
You will see your results stream now centred at zero according to the following calculation (Test Results - Reference Results) / Reference Results [Relative Difference]
If you see any major deviations, this is a probably cause for a concern, in our case, for dropped frames
Let's continue this discussion in the following location:
PQA Help
http://forums.ni.com/t5/NI-VideoMASTER-and-NI/PQA-Help/m-p/2305242/
Thank you.
Sincerely,
Greg S.

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How frame drop test is executed using PQA in TestStand ?

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