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DuncansOnline

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Posts posted by DuncansOnline

  1. Posted

    There is a fair amount to absorb in your last post! Thanks.

     

    One question......I know and understand that the live TV image is superior.

     

    What happens when a recorded video is played back through the TV? Does it have the same quality as when it is viewed live?

     

    Would a person be well advised to locate their DVR caputer close to a Wide Screen LCD or Plasma TV not only for viewing, but also for playback?

  3. Posted

    This is comparison written by CollinR is obviously written from experience and is very valuable.

     

    My immediate interests in comparing has to do with the quality of video produced.

     

    I am starting to put together a FAQ on video quality, and I have identified 10 points to explore and discuss......really having to do with things other than the card.

     

    Right now I am trying to understand the difference between MPEG4 and H2.64. I am learning that H2.64 is a relatively new version of MPEG4 and is sometimes referred to as MPEG4-10

     

    I have not discovered if AVerMedia and GeoVision are using different codecs, or what the differences would be between codecs or between the images produced by either card.

     

    Any contributions to this discussion would be really helpful, very welcome and certainly invited.

     

    1. The resolution that you have set the DVR software to run at.

     

    Running at

    CIF 352 X 240

    CIF2 640 X 480

    D1 720 X 480

     

     

    The higher the resolution is set for, the greater details and image quality you will achieve. This setting however may effect performance, depending on the CPU speed, memory, and video card of the system in which you have the card installed..

     

     

    2. Video card and amount of onboard memory (on the card)

    especially as opposed to motherboard onboard memory.

     

     

    An AGP Express card will render more effectively than an AGP card

    An AGP card will render more effectively than a PCI card

    An AGP card will give better rendering than onboard video

     

    an higher end nVideo card or higher end ATI card will give better rendering than an Intel card.

    The amount of memory on the video card is a factor

     

     

    The driver...is it updated....native Windows driver or the chip sets manufacturer latest driver?

     

     

    3. The amount of memory on the Motherboard is a factor not only in systems with onboard memory but also when there are AGP Express, AGP or PCI cards handling the video.

     

     

    4. Camera resolution 380-420-480-530-550 TVLs as well as the refresh rate of the camera.

     

    5. brightness, contrast, hue and saturation controls within the DVR program

     

    6. resolution of the monitor 1024 X 768 or 1280 X 1024...The width of the monitor....19" monitors distort. The brightness, contrast, hue and saturation controls of the monitor

     

     

    7. Type of light

     

    indoor incandescent mostly blue spectrum

    indoor fluorescent mostly red spectrum

    outdoor daylight - full spectrum

     

     

    8 Speed of moving subject - type of camera - refresh rate

     

     

    9. Frames per second rate recording or viewing.

     

     

    10. Compression

     

    Indeo5

    MPEG4

    JPEG

  4. Posted

    A customer of ours has an AVerMedia nv3000 card and is using a CNB - 4.3mm - 12LED outside camera that has a SUPERHAD image sensor with 380 TVLs.

     

    When he looks at the image produced by the camera directly on his TV it is great!

     

    When he attaches his camera to the AVernv3000 card there is a dramatic loss of quality.

     

    The colors are very poor, there is a significant loss of detail such as textures of the concrete of his walkway and loss of definition of leaves on a shrub. This naturally concerns us as his ability to capture detail of an intruder is greatly diminished.

     

    He has upgraded his video card with no appreciable change in quality.

     

    Why does this problem of loss of quality happen?

     

    Would the nv5000 card render a higher quality image. or would it be the same except a higher frame rate?

     

    What can he do to improve the image? Would it change much if he upgraded to a 520 TVL camera...

     

    He is completely satisfied with the image of the 380 TVL CNB camera on his TV. Why does it degrade so much?

     

    Would a GeoVision card perform better?

     

    Thanks in advance for any thoughts or ideas to help our knowledge and understanding.

     

    Would a stand-alone DVR improve the image quality?

  5. Posted

    I have been searching with Google to find any discussions about the quality of video produced by AVerMedia cards when compared to GeoVision cards.

     

    I have not found much to read.

     

    I am particularly interested in head to head comparisons....such as the AVernv3000 directly compared to the GV-600 and of the AVernv5000 directly compared to the GV-800.

     

    Any comments would be most welcome. Especially discussing color depth, crispness, rendering of detail and crispness.

  6. Posted

    I have been searching with Google to find any discussions about the quality of video produced by AVerMedia cards when compared to GeoVision cards.

     

    I have not found much to read.

     

    I am particularly interested in head to head comparisons....such as the AVernv3000 directly compared to the GV-600 and of the AVernv5000 directly compared to the GV-800.

     

    Any comments would be most welcome. Especially discussing color depth, crispness, rendering of detail and crispness.

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