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  1. J

    Wall mount compatibility of various brackets and bullet cams

    To read that flow chart, start with the camera in question and then follow the arrows. Think of the lines as one way streets with the arrows indicating the direction of travel. The flow chart shows the HFW7 shape attaching directly to the PFA121 junction box. The PFB121W also attaches to the...
  2. J

    Help With Blurry Image

    I'm not sure what you mean by no improvement, I see a lot of improvement from your first photos to the last. You're going to need to up your shutter speed even more if you want "freeze action" images. Sports photographers typically start at 1/1000 and only get faster than that depending on the...
  3. J

    New Panoramic Cams from Dahua

    I got a price break in exchange for being the first one to buy (and test) one, but I believe they're going for ~$650. I'll be using it as an overview camera for the whole front side of the house. Really though, it's so that the Mrs. only has to monitor one feed to keep an eye on the kids when...
  4. J

    New Panoramic Cams from Dahua

    I just received one from Andy, and it's definitely not designed for flush mounting. It's designed to screw in. But if you have access to your ceiling joists, it should be possible with some extra effort. The pfb302s mount is not listed as an accessory for the PDBW8800-180, but that's probably...
  5. J

    Dahua 2MP 25x Starlight IR PTZ Network Camera (SD49225T-HN)

    Yep, it is, because the bit rate is in kilobits per second, not kilobits per frame. If you have fewer frames in a second, there are more bits to use per frame for the compression, so each frame is compressed less, which means more detail is retained. That's all in theory though, in practice you...
  6. J

    Dahua 2MP 25x Starlight IR PTZ Network Camera (SD49225T-HN)

    That's interesting that you're getting different recording times, are you positive both are set to CBR? It could be their encoder just isn't very good at hitting its target bit rate (I come from the video processing world, not CCTV, so this amount of variance might be totally normal in this...
  7. J

    Dahua 2MP 25x Starlight IR PTZ Network Camera (SD49225T-HN)

    In CBR mode, the encoder shouldn't care about B&W vs color. Depending on how they've setup their encoder, it might make a difference in VBR mode. You'd have to do a controlled test with the same scene to be able to tell for sure though. Because in VBR mode, the composition of the image, and the...
  8. J

    Dahua 2MP 25x Starlight IR PTZ Network Camera (SD49225T-HN)

    Some programs require, or work better with an MJPEG stream. E.g. OpenALPR (automatic license plate recognition). That image was not indicative of what to expect from MJPEG, it's typically slightly better quality than h264 at a significantly higher bandwidth cost. That image was probably from the...
  9. J

    Dahua 2MP 25x Starlight IR PTZ Network Camera (SD49225T-HN)

    CBR stands for Constant Bit Rate (VBR = Variable Bit Rate), so regardless of the amount of motion it's always going to be ~4096kbps. Also, the bit rate is independent of the frame rate. Whether it's 15fps or 25fps, it will still be 4096kbps. The higher the fps, the fewer bits there are to use...
  10. J

    Dahua Starlight Varifocal Bullet Z5 7-35mm (IPC-HFW5231E-Z5)

    Camera Calculator / Design Software The free version only lets you do one camera at a time. But it's still pretty handy.
  11. J

    New Panoramic Cams from Dahua

    FYI: My curiosity got the better of me and I ordered the IPC-PDBW8800-A180 from Andy. I'll keep you all in the loop as I test it out.
  12. J

    New Panoramic Cams from Dahua

    You're right about corridor mode, you can see the seems in Korgoth's video. As for resolution, this actually has the same pixel density as the 3 camera model (they're both 4096/180˚), it just has nearly twice the vertical FOV. But, you give up some lens speed (f2.0 vs f1.8) for that extra...
  13. J

    4k starlights

    So... Canon, Nikon, Toshiba, Samsung, Panasonic, etc... aren't "decent competition", but Nvidia who has absolutely no experience in the industry, and hasn't had to deal with more than one competitor in ages, would blow away Sony... I have no idea why you think Nvidia would be more successful (or...
  14. J

    Dahua 2MP 25x Starlight IR PTZ Network Camera (SD49225T-HN)

    You brought the issue to everyone's attention, and hopefully the specs on the website get corrected, or at least anyone researching the camera who is looking for long shutter times runs into this thread. Thank you for that. I think everyone here appreciates finding out about inaccuracies in the...
  15. J

    Dahua 2MP 25x Starlight IR PTZ Network Camera (SD49225T-HN)

    I know these posts are a couple weeks old, and the conversation has moved on. But I just wanted to point out that the rule of thumb in video capture is to use a shutter speed that results in the shutter being open 50% of the time. So 30fps would use a 1/60 shutter speed, 15fps 1/30 shutter...
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