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Multisof VIDEO GRABBER Technical Manual

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VIDEO GRABBER
Technical Manual

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Summary of Contents for Multisof VIDEO GRABBER

  • Page 1 VIDEO GRABBER Technical Manual...
  • Page 2 Description Author 27.04.2015 New document 28.04.2015 Revised to match software version 1.8 26.10.2015 Revised to match software version 1.10 20.12.2015 Revised to match software version 1.13 17.03.2016 Revised to match software version 1.19 Video Grabber Technical Manual - ver. 1.4...

  • Page 3: Table Of Contents

    2.2.2. Modeline string format..................11 2.2.3. Deploying custom Modeline using Video Grabber Web Interface......14 Appendix A – Video Grabber protocol v2 ................. 15 Appendix B – Supported resolutions ..................17 Video Grabber Technical Manual - ver. 1.4...

  • Page 4: Features

    1. Features Multisoft Video Grabber is a device that captures video signal between Graphics Card and Monitor. Armed with two DVI-I video sockets, for capturing Analogue (using D-SUB to DVI adaptor or hybrid cable) as well as digital signal using Digital Virtual Interface cables. Captured video can be send via two independent Gigabit Ethernet ports to two separated recorders.

  • Page 5: Technical Specification

    2x DVI-I (24 + 5 pin) sockets for capturing video signal (VGA -> DVI adaptors required for capturing analogue signal; not included) Output 2x Gigabit Ethernet NIC’s for transferring captured video Table 1: Technical specification Video Grabber Technical Manual - ver. 1.4...

  • Page 6: Video Adjustment

    2. Video adjustment 2.1. Preview & adjust In Preview & adjust tab of Video Grabber Web Interface allowing to modify or correct detected video setting. Because of many manufacturers and display types, detected analogue video parameters are not always satisfactory. To do this, override video position (VGA only check button must be active).

  • Page 7: Extended Display Identification Data (Edid)

    For this purpose, we will use the EDID section in the Configuration tab. Figure 2. Video Grabber Configuration – EDID section Video Grabber Technical Manual - ver. 1.4...
  • Page 8 Clear EDID table in device and load default EDID table. Table 2. Video Grabber EDID sections parameter description In order to check currently used EDID table please use Status tab in web-based Video Grabber interface as is shown on Figure 3. Video Grabber Status Tab – EDID table.

  • Page 9: Calculating Custom Modeline

    In some hardware configurations, you need to calculate custom Modeline because of the screen resolution, which has not been sent from the display to Video Grabber via EDID (Extended Display Identification Data) or because Pixel Clock of this resolution is higher than supported by device. Some Graphics Adapters are provided tools to set or check actual Modeline but not all graphics drivers display this information.
  • Page 10 3. From timing Drop-Box button please select Automatic – LCD standard (1). 4. In the two fields below please type horizontal number of pixels (2) and vertical number of lines (3). All remaining fields will be filled automatically. Video Grabber Technical Manual - ver. 1.4...

  • Page 11: Modeline String Format

    Figure 6. Example of Modeline string for resolution 1920x1080 Modeline "1920x1080" 148 1920 2008 2052 2200 1080 1084 1089 1125 -hsync +vsync Figure 6. Example of Modeline string for resolution 1920x1080. Figure 7. Modeline calculation Video Grabber Technical Manual - ver. 1.4...
  • Page 12 Expected vertical lines + front porch + sync width F + G + H Total vertical lines Horizontal sync polarity +hsync / -hsync Vertical sync polarity +vsync / -vsync Table 3. Modeline parameters description table (ref. to Figure 7 for values). Video Grabber Technical Manual - ver. 1.4...
  • Page 13 ( [ +hsync / +vsync ], [ +hsync / -vsync ], [ -hsync / +vsync ], [ -hsync / -vsync ] ). All parameters in Modeline string are space separated, different separation symbol is not acceptable and take no effect with device. Video Grabber Technical Manual - ver. 1.4...

  • Page 14: Deploying Custom Modeline Using Video Grabber Web Interface

    2.2.3. Deploying custom Modeline using Video Grabber Web Interface. In Preview & Adjust tab is a special field, where we can define our custom modeline. To do that Override video position (VGA only) and Update modeline checkboxes, must be checked.

  • Page 15: Appendix A - Video Grabber Protocol V2

    Appendix A – Video Grabber protocol v2 Data is streamed using UDP packets. Every frame is identified by header that is formatted: MAGIC: 4 * UCHAR header: ‘V’ ‘G’ ‘B’ ‘R’ VER: UCHAR version: 0x01 VID_TYP: UCHAR frame type: Bits 2:0 – video frame format: 0x0 –...
  • Page 16 After finding right header, next one doesn’t have to be found, because it can be calculated: Next_fram_off = current_frame_off + sizeof (VideoGrabber_PseudoFrame_t). In case of losing some data (network problems) synchronization process has to be repeated. Video Grabber Technical Manual - ver. 1.4...

  • Page 17: Appendix B - Supported Resolutions

    2048 1536 2048 2048 Table 4. Video Grabber VGA / DVI - Supported resolutions table - It’s required to set CVT reduced blank in driver’s settings. - DVI Dual Link Cable is required. Video Grabber Technical Manual - ver. 1.4...

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