Running script on recording after complete?

[cloudy]

I'm trying to run some image processing on videos recorded by BI. The issue is, whilst I can trigger the script at the start of the recording, I don't actually know when the file is finished being written to (as subsequent triggers can make the video longer)
Is there a way to trigger something on recording end?

 

[cloudy]

Actually turns out the "alert off" trigger is at the end of the recording - has solved my issue!