The file sizes were all around 2000, which I guess is about right for 2 seconds of video:
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I then changed the pre-event recording to "0" and that seemed to fix it.
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Now my issue is that it seems to be recording for 100 seconds even if the trigger event moves out of the frame within 5 seconds. I was hoping it would be more dynamic than that, but perhaps I should lower the max recording limit to 30 seconds, to save sdcard space. I just worry about missing any movement that is actually longer than 30 seconds if I do that.