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This is a list of links (mostly external) to some useful information and articles about such things as audio/video compression, file formats, etc.

  VC-1 Technical Overview

This is a Microsoft article that provides an overview of VC-1 and details its status as an established open standard. Comparative information is given to demonstrate how well VC-1 compares to two other codecs in use today, H.264 and MPEG-2.

  VC-1 from Wikipedia

This is a link to Wikipedia's entry about VC-1. This article gives a only brief overview of VC-1 and it's features.

  A comparison of H.264 and VC-1 from Wikipedia

A brief comparison of H.264 and VC-1. Unfortunately there are a few errors in the tables.

  Trade-offs with H.264, VC-1 and other advanced codecs

This is an 2006 EE Times article discussing the newer advanced video codecs.

  The VC-1 and H.264 Video Compression Standards for Broadband Video Services

This book, by Jae-Beom Lee and Hari Kalva, is a good reference book for those interested in the VC-1 and H.264 standards.

  An Overview of Advanced Systems Format

This Microsoft article presents Advanced Systems Format (ASF). ASF is a file and container format designed to store multimedia data. It is a format suitable for both streaming over networks and local playback.

At Enciris Technologies we are focused on providing quality and responsive technical support

We have technical staff that is fluent in English, French, German, Dutch...

Currently our support staff is based in France and is generally from about 8:00am to 7:00pm CET (UTC/GMT + 1). For our North American customers this corresponds to 2:00am/1:00pm EST.

Support Technical Compression Board

  FAQ list

Please check our FAQ. It is quite possible that your problem or question may be encountered frequently.

  Support center

If you can't find what you are looking for in our FAQ or forum please send us a support ticket using our Support Center. This is the preferred way of sending us a support request. All support tickets are assigned directly to one of our engineers.

  Contact us

Of course you are always free to contact us directly. Proceed to the contact us page.

For technical support our preferred method of contact remains our support center system as this alow for full traceability of issues and alow us to redirect the request to the appropriate person and provide you a timely response.

  • 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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