False positives

Discussion in 'tinyCam' started by veert, Jun 14, 2019.

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  1. veert

    veert Young grasshopper

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    I've been using TinyCam for a few months now, and I think, it's a very well thought-out app.

    One area that's giving me trouble, though, is false positives. I'll be as specific as I can:

    In-app motion detection
    Video source: Blue Iris / v4 / H264
    Sensivity: 35

    Now, it would make sense to reduce sensitivity, right? I did lower it to 25.... only to start getting more false alarms. How do I know, those are false? By cross-checking them with Blue Iris.

    No continuous recording.
    No recording within TinyCam, either.

    So, technically speaking, I can't be 100% certain, nothing happens.

    One thing I know, though,is that Blue Iris is unlikely to miss potential events in this area, since there's more than one cam watching it from different angles. Plus, for some reason, those false alarms mostly happen at night, when the area is illuminated with LED lamps. Last night, I experienced two of those within 15 minutes while holding the phone in my hand and looking at the live feed in near real time.

    The scene is indoors, so no moving trees, etc.

    Questions for the dev:
    * is a 10% drop in sensitivity not enough?
    * how can a drop in sensitivity increase the number of alarms?
    * could it be something to do with LED light spectrum, power fluctuations etc.?
     
    mat200 likes this.
  2. alexvas

    alexvas tinyCam Developer

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    Can you record a false positive mp4 file and send it to me for troubleshooting?

    * In most cases it is enough.
    * Increase of sensitivity should increase number of motion alarms.
    * That could be with power frequency fluctuations, LED light spectrum, etc.
     
  3. veert

    veert Young grasshopper

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    PM'd you.
    Everyone else - guess, I'll post an update once we have meaningful results.
     
  4. veert

    veert Young grasshopper

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    FWIW, the alarms are caused by weird artifacts, such as:
    * image suddenly turning blue, or
    * image turning blue with a green outline of the scene being visible
    * image turning black with a whitish outline of the scene visible
    ....etc.
    Naturally, such frames get registered as motion.
    What causes those, I don't know. It could be the fact that I use a custom ROM, or anything else. I don't feel like messing around w/ codecs, even though that might be the right thing to do. Tried both primary and secondary channels, if that makes any sense for a Blue Iris installation.