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Frequently Asked Questions

  • What kind of HD video inputs does the LT-101 have?

    The HD inputs are via DVI and SDI. DVI is a very flexible HD input and when combined with inexpensive (meaning a few dollars) cable adapters it can accept HDMI, DVI-I, DVI-A, analog RGB, analog component / YPrPb / YUV, and VGA. SDI is an option on the LT-101 and accepts both SD and HD signals. Read More
  • Do the LT-101 products have HDCP support for HDMI sources?

    No. Audio/video materials that are copy protected with HDCP can't be acquired or compressed by general purpose hardware such us ours. As our products are not closed systems there is no way for us to guaranty that they won't be used for illegal duplication or transmission of copy protected materials. Consequently, we are not permitted to include HDCP decoding. Unfortunately, there are some equipment manufacturers who have taken to HDCP encoding their outputs even for non copy protected materials (e.g. home movies, etc.) We have seen this problem with the HDMI outputs of some BlueRay players which treat non-copy and copy protected material identically. If this is the case, you can try an adapter such as the HDfury (use your favorite search engine to find one). Read More
  • Can I use an inexpensive camcorder as an HDTV camera with the LT-101 products?

    If the camcorder has an HDMI, RGB, or component output, it should work. Recently, several low cost HD camcorders with HDMI outputs have been introduced giving good quality 1080 video. Read More
  • What are I and P frames?

    A frame is a picture (or an image) in compression terminology. I frames are Intra coded images where the same image content is used as reference for prediction. Inter frames are temporal referenced pictures. Read More
  • What does "Intra SAD threshold" mean?

    "Intra SAD threshold" is a parameter that is used to steer the amount of "Intra" coded Macroblocks in a frame. 17000 should be a good average value. This value has been determined empirically. If set to 0, all Macroblocks will be coded as Intra Read More
  • What does "Use I-frame EPL" mean?

    "Use I-frame EPL" stands for use Intra frame entry point layer syntax element. EPL is an optional VC-1 header syntax element that can be placed just before an Intra frame. This syntax element allows a player to enter the stream at random positions. Read More
  • How does demo application's "constant quality mode work"?

    When used, this mode bypasses the bitrate control mechanism and configures a constant quantization parameter. The result is a constant quality video no matter what target bitrate has been set. If set to 0, bitrate control will try to achieve the target bitrate given by the user. Read More
  • How Does LT101 behave, when you connect it to a computer graphics card"?

    Is the LT-101 the same as a monitor? We are not exactly like a general purpose monitors. Unlike most monitors we have a single DVI connector for both analog and digital signals. Monitors typically have a VGA (DB15) input for analog signals and a DVI-D/HDMI input for digital signals. Monitors do this to avoid confusing for the lay user. Connection scenarios. Graphics card connected to a monitor via DVI-I cable: The graphics card will output digital video as the analog pins on the monitor’s DVI connector are not connected internally. The graphics card had also attempted to detect an analog receiver but never found one. Graphics card connected to a monitor via DVI-D cable: Obviously the graphics card will output digital video as the analog signals are not present in the cable. Again the graphics card had also attempted to detect an analog receiver but never found one. Graphics card connected to a monitor via VGA cable: Of course the graphics card never detected a digital receiver as there is none connected to the DVI port. It will output analog. Graphics card connected to LT-101 via DVI-I cable. Here the graphics card detects both an analog receiver and a digital receiver. What will it choose? Our tests have shown that it can go either way. And there is nothing we can do about it. It’s entirely up to the graphics card. Graphics card connected to LT-101 via DVI-D cable. Here the graphics card detects on the digital receiver as the analog signal are not present in the cable . The graphics card has, of course, attempted to detect an analog receiver as well but never found one. Graphics card connected to LT-101 via VGA cable. Here the graphics card detects an analog receiver as there are no digital signals. How does the graphics card detect the presence of an analog or digital receiver? The usual technique is to simply check for a load. The graphics card will output video to the signals for which it has detected a load. If it detects an analog load, it outputs analog video. The same applies to a digital load. As we will see this load detection is not done continuously. So when does the graphics card check for a load present? In all probability this is the crux of the issue. It depends on the graphics card and its driver. Most graphics cards rescan Read More
  • What is a GOP?

    A GOP is made up of one I-frame followed by zero or more P-frames. E.g. a GOP of 5 is composed of following I and P frames IPPPPIPPPPPI... Read More
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