Trying to capture DVI out from a 1280x1024p60 thermal camera - Magewell USB

[Rookie_Mistake]

First post newbie here....

I have a circa 2008 thermal camera manufactured by L3 (actually, thermal with Image Intensifier, digitally fused). The goal is to be able to record the digital video, ideally using portable battery-powered hardware.

The thermal camera has a wonky proprietary port for video out, and can allegedly output "DVI" and "NTSC" video formats. It came with a cord that converts to female DVI-I port, but I don't think there is any analog on it.

If I hook the thermal camera up to a DVI computer monitor (such as Dell S2309W) with a DVI-D single link cable, it recognizes the video as 1280x1024p60.

If I hook the thermal camera up to an HDMI computer monitor (Samsung) via a bidirectional DVI to HDMI cable or dongle, the monitor recognizes the video as 1280x1024p60 with 64.0kHz horizontal sync rate.

I have an Atomos Ninja V that does not recognize the HDMI stream. I recently acquired a Magewell USB Capture HDMI 4K Plus. Although it lists 1280x1024 as an accepted HDMI format, it is not able to identify the video output or lock on it.

There is a place to edit EDID values, front porch, etc. as well as the precise frame rate. I have tried most of the common ones for 1280x1024p60 VESA.

Any idea how to get more diagnostic info off the DVI video, and/or figure out a way to grab the video?

[october262]

First post newbie here....

I have a circa 2008 thermal camera manufactured by L3 (actually, thermal with Image Intensifier, digitally fused). The goal is to be able to record the digital video, ideally using portable battery-powered hardware.

The thermal camera has a wonky proprietary port for video out, and can allegedly output "DVI" and "NTSC" video formats. It came with a cord that converts to female DVI-I port, but I don't think there is any analog on it.

If I hook the thermal camera up to a DVI computer monitor (such as Dell S2309W) with a DVI-D single link cable, it recognizes the video as 1280x1024p60.

If I hook the thermal camera up to an HDMI computer monitor (Samsung) via a bidirectional DVI to HDMI cable or dongle, the monitor recognizes the video as 1280x1024p60 with 64.0kHz horizontal sync rate.

I have an Atomos Ninja V that does not recognize the HDMI stream. I recently acquired a Magewell USB Capture HDMI 4K Plus. Although it lists 1280x1024 as an accepted HDMI format, it is not able to identify the video output or lock on it.

There is a place to edit EDID values, front porch, etc. as well as the precise frame rate. I have tried most of the common ones for 1280x1024p60 VESA.

Any idea how to get more diagnostic info off the DVI video, and/or figure out a way to grab the video?

does the camera have an sd card slot to save the video on to an sd card ??

[Rookie_Mistake]

First post newbie here....

I have a circa 2008 thermal camera manufactured by L3 (actually, thermal with Image Intensifier, digitally fused). The goal is to be able to record the digital video, ideally using portable battery-powered hardware.

The thermal camera has a wonky proprietary port for video out, and can allegedly output "DVI" and "NTSC" video formats. It came with a cord that converts to female DVI-I port, but I don't think there is any analog on it.

If I hook the thermal camera up to a DVI computer monitor (such as Dell S2309W) with a DVI-D single link cable, it recognizes the video as 1280x1024p60.

If I hook the thermal camera up to an HDMI computer monitor (Samsung) via a bidirectional DVI to HDMI cable or dongle, the monitor recognizes the video as 1280x1024p60 with 64.0kHz horizontal sync rate.

I have an Atomos Ninja V that does not recognize the HDMI stream. I recently acquired a Magewell USB Capture HDMI 4K Plus. Although it lists 1280x1024 as an accepted HDMI format, it is not able to identify the video output or lock on it.

There is a place to edit EDID values, front porch, etc. as well as the precise frame rate. I have tried most of the common ones for 1280x1024p60 VESA.

Any idea how to get more diagnostic info off the DVI video, and/or figure out a way to grab the video?

does the camera have an sd card slot to save the video on to an sd card ??

No, it has no built in recording function whatsoever.

The only ports are battery and the proprietary weird video out (looks like a miniature d-sub) with the funky cable that goes to DVI.

[october262]

First post newbie here....

I have a circa 2008 thermal camera manufactured by L3 (actually, thermal with Image Intensifier, digitally fused). The goal is to be able to record the digital video, ideally using portable battery-powered hardware.

The thermal camera has a wonky proprietary port for video out, and can allegedly output "DVI" and "NTSC" video formats. It came with a cord that converts to female DVI-I port, but I don't think there is any analog on it.

If I hook the thermal camera up to a DVI computer monitor (such as Dell S2309W) with a DVI-D single link cable, it recognizes the video as 1280x1024p60.

If I hook the thermal camera up to an HDMI computer monitor (Samsung) via a bidirectional DVI to HDMI cable or dongle, the monitor recognizes the video as 1280x1024p60 with 64.0kHz horizontal sync rate.

I have an Atomos Ninja V that does not recognize the HDMI stream. I recently acquired a Magewell USB Capture HDMI 4K Plus. Although it lists 1280x1024 as an accepted HDMI format, it is not able to identify the video output or lock on it.

There is a place to edit EDID values, front porch, etc. as well as the precise frame rate. I have tried most of the common ones for 1280x1024p60 VESA.

Any idea how to get more diagnostic info off the DVI video, and/or figure out a way to grab the video?

does the camera have an sd card slot to save the video on to an sd card ??

No, it has no built in recording function whatsoever.

The only ports are battery and the proprietary weird video out (looks like a miniature d-sub) with the funky cable that goes to DVI.

whats the model of the thermal camera ??

[Rookie_Mistake]

First post newbie here....

I have a circa 2008 thermal camera manufactured by L3 (actually, thermal with Image Intensifier, digitally fused). The goal is to be able to record the digital video, ideally using portable battery-powered hardware.

The thermal camera has a wonky proprietary port for video out, and can allegedly output "DVI" and "NTSC" video formats. It came with a cord that converts to female DVI-I port, but I don't think there is any analog on it.

If I hook the thermal camera up to a DVI computer monitor (such as Dell S2309W) with a DVI-D single link cable, it recognizes the video as 1280x1024p60.

If I hook the thermal camera up to an HDMI computer monitor (Samsung) via a bidirectional DVI to HDMI cable or dongle, the monitor recognizes the video as 1280x1024p60 with 64.0kHz horizontal sync rate.

I have an Atomos Ninja V that does not recognize the HDMI stream. I recently acquired a Magewell USB Capture HDMI 4K Plus. Although it lists 1280x1024 as an accepted HDMI format, it is not able to identify the video output or lock on it.

There is a place to edit EDID values, front porch, etc. as well as the precise frame rate. I have tried most of the common ones for 1280x1024p60 VESA.

Any idea how to get more diagnostic info off the DVI video, and/or figure out a way to grab the video?

does the camera have an sd card slot to save the video on to an sd card ??

No, it has no built in recording function whatsoever.

The only ports are battery and the proprietary weird video out (looks like a miniature d-sub) with the funky cable that goes to DVI.

whats the model of the thermal camera ??

The thermal camera is a very obscure (practically prototype) device. It was made by the defense contractor L3. It came with a small stapled paper manual. There are literally zero public documents or references to it on the web. This is for a science experiment and it is the only HW available that can do a few things.

Any idea if a dedicated DVI-to-USB capture device might have more special sauce at decoding DVI-D video?

[usually_quiet]

I looked at the specification for the Magewell USB Capture HDMI 4K Plus provided on the product page at Magewell's website but didn't see 1280x1024 listed as a supported resolution. Where did you find documentation stating that 1280x1024 could be captured using this device?

So far the INOGENI DVIUSB is the only capture device that I have found that specifically says that it captures 1280x1024 at 60, 59.94, 50, 30, 29.97, 25, 24, or 23.98 Hz from DVI. See specifications at https://inogeni.com/product/converters-comparison-table-5/

I will keep looking for other devices and come back with any others that I find.

[Edit]If you can use a desktop PC, there is a discontinued PCI-e X1 card, the Startech PEXHDCAP, that captures 1280x1024 video from DVI. Spec sheet: https://media.startech.com/cms/pdfs/pexhdcap_datasheet.pdf You might be able to find a used one on eBay at a reasonable price. This card is quite versatile and was used by retro gamers for capture. See https://videogameperfection.com/2012/07/25/startech-pexhdcap-capture-card-review-added/

[Rookie_Mistake]

I looked at the specification for the Magewell USB Capture HDMI 4K Plus provided on the product page at Magewell's website but didn't see 1280x1024 listed as a supported resolution. Where did you find documentation stating that 1280x1024 could be captured using this device?

So far the INOGENI DVIUSB is the only capture device that I have found that specifically says that it captures 1280x1024 at 60, 59.94, 50, 30, 29.97, 25, 24, or 23.98 Hz from DVI. See specifications at https://inogeni.com/product/converters-comparison-table-5/

I will keep looking for other devices and come back with any others that I find.

[Edit]If you can use a desktop PC, there is a discontinued PCI-e X1 card, the Startech PEXHDCAP, that captures 1280x1024 video from DVI. Spec sheet: https://media.startech.com/cms/pdfs/pexhdcap_datasheet.pdf You might be able to find a used one on eBay at a reasonable price. This card is quite versatile and was used by retro gamers for capture. See https://videogameperfection.com/2012/07/25/startech-pexhdcap-capture-card-review-added/

I now have both a Magewell USB Capture HDMI 4K Plus and a Magewell USB Capture DVI Plus.

Magewell's config tool lists 1280x1024 among the many that it can capture. The HDMI 4k plus can basically be configured to grab damn near any video signal with a pixel clock less than 595MHz.

The 1280x1024p60 works out to be ~180MHz in most versions.

I know the signal is there since I can get it on computer monitor DVI and computer monitor HDMI, but HDMI TVs (and my Atomos Ninja V) can't grab it.

So far, I am having zero luck with either magewell product.

[usually_quiet]

I guess the capture software you are using doesn't provide a log file with any clues about what went wrong or display any informative error messages when connected to L3 thermal camera.

Your capture devices won't capture HDCP-protected signals, so ordinarily, I'd suspect HDCP was the problem. However, the output from a camera shouldn't use HDCP, so that can't be it.

DVI is supposed to provide EDID data and use a handshake to negotiate the connection between the source device (camera) and sink device (capture device), just as HDMI does. Maybe that is where the problem lies. Unfortunately, I don't know how to diagnose it.

[Rookie_Mistake]

I guess the capture software you are using doesn't provide a log file with any clues about what went wrong or display any informative error messages when connected to L3 thermal camera.

Your capture devices won't capture HDCP-protected signals, so ordinarily, I'd suspect HDCP was the problem. However, the output from a camera shouldn't use HDCP, so that can't be it.

DVI is supposed to provide EDID data and use a handshake to negotiate the connection between the source device (camera) and sink device (capture device), just as HDMI does. Maybe that is where the problem lies. Unfortunately, I don't know how to diagnose it.

I don't think it is HDCP issue.

Both the DVI Plus and the HDMI 4K plus devices have no trouble recognizing a 1920x1080p60 panasonic camcorder.

With the Magewell DVI Plus, I can go from "no signal" to "unsupported signal" when I toggle the thermal camera video on-off.

What is frustrating is that old computer monitors have no trouble locking the signal, but neither Magewell USB capture device can get it.

[Cornucopia]

Not all signals that are possible with HDMI are supported by the capture device(s), and this sounds like one of them. There are EDIDs that are PC-centric and there are those that are Consumer Electronics (CE)-centric. The latter is almost always completely supported, but the former has so many variations, that not all are covered, even when the combination falls within the limits of the bandwidth & sample clock.

You could keep trying various capture cards/devices until you find one that supports this specific flavor. Or you could get a hold of a scalar that would convert it to a more standard format (e.g. 1366x1024p60, 1280x720p60, 1440x1080p60, etc). There are a variety of scalars out there, and some support more format flavors than others. I know, for example, that the Extron IN1608 (I own one) supports your flavor, but it isn't cheap.


Scott

[Rookie_Mistake]

Not all signals that are possible with HDMI are supported by the capture device(s), and this sounds like one of them. There are EDIDs that are PC-centric and there are those that are Consumer Electronics (CE)-centric. The latter is almost always completely supported, but the former has so many variations, that not all are covered, even when the combination falls within the limits of the bandwidth & sample clock.

You could keep trying various capture cards/devices until you find one that supports this specific flavor. Or you could get a hold of a scalar that would convert it to a more standard format (e.g. 1366x1024p60, 1280x720p60, 1440x1080p60, etc). There are a variety of scalars out there, and some support more format flavors than others. I know, for example, that the Extron IN1608 (I own one) supports your flavor, but it isn't cheap.


Scott

Allegedly, according to Magewell, the USB Capture HDMI 4K Plus 32090 does support 1280x1024p60 input (seems to be backed up by EDID decode below), as does the Magewell USB Capture Plus 32080 (does not seem to have 1280x1024p60 per the EDID decode below).

The resolution is listed in the Magewell software as an input option. No idea how to get it to actually lock.

The Inogeni product (DVI2USB3) might support it.

Unfortunately, for the experiment I need to run, I can't lug a rack-mount video scaler out there.

[Rookie_Mistake]

I ran the Magewell USB Capture HDMI 4K Plus through the Monitor Asset Manager software (reads the EDID of the capture device and/or monitors).

It lists "1280 x 1024p at 60Hz - VESA STD" as a standard timing that is supported. Output below.


Monitor
Model name............... USB Capture
Windows description...... Generic PnP Monitor
Manufacturer............. MGW
Plug and Play ID......... MGW0001
Serial number............ 1
Manufacture date......... 2016, ISO week 1
Filter driver............ None
-------------------------
EDID revision............ 1.3
Input signal type........ Digital
Color bit depth.......... Undefined
Display type............. Monochrome/grayscale
Screen size.............. Undefined or variable
Power management......... Not supported
Extension blocs.......... 1 (Unknown type)
-------------------------
DDC/CI................... n/a

Color characteristics
Default color space...... Non-sRGB
Display gamma............ 2.20
Red chromaticity......... Rx 0.640 - Ry 0.330
Green chromaticity....... Gx 0.300 - Gy 0.600
Blue chromaticity........ Bx 0.150 - By 0.060
White point (default).... Wx 0.313 - Wy 0.329
Additional descriptors... None

Timing characteristics
Horizontal scan range.... 15-135kHz
Vertical scan range...... 15-150Hz
Video bandwidth.......... 600MHz
CVT standard............. Not supported
GTF standard............. Not supported
Additional descriptors... None
Preferred timing......... Yes
Native/preferred timing.. 3840x2160p at 60Hz (16:9)
Modeline............... "3840x2160" 529.200 3840 3864 3880 3920 2160 2168 2178 2250 +hsync +vsync
Detailed timing #1....... 1920x1080p at 60Hz (16:9)
Modeline............... "1920x1080" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync

Standard timings supported
720 x 400p at 70Hz - IBM VGA
720 x 400p at 88Hz - IBM XGA2
640 x 480p at 60Hz - IBM VGA
640 x 480p at 67Hz - Apple Mac II
640 x 480p at 72Hz - VESA
640 x 480p at 75Hz - VESA
800 x 600p at 56Hz - VESA
800 x 600p at 60Hz - VESA
800 x 600p at 72Hz - VESA
800 x 600p at 75Hz - VESA
832 x 624p at 75Hz - Apple Mac II
1024 x 768i at 87Hz - IBM
1024 x 768p at 60Hz - VESA
1024 x 768p at 70Hz - VESA
1024 x 768p at 75Hz - VESA
1280 x 1024p at 75Hz - VESA
1152 x 870p at 75Hz - Apple Mac II
640 x 480p at 60Hz - VESA STD
800 x 600p at 60Hz - VESA STD
1024 x 768p at 60Hz - VESA STD
1152 x 864p at 60Hz - VESA STD
1280 x 1024p at 60Hz - VESA STD
1920 x 1200p at 60Hz - VESA STD
2048 x 1152p at 60Hz - VESA STD

Report information
Date generated........... 4/11/2022
Software revision........ 2.91.0.1043
Data source.............. Registry
Operating system......... 10.0.19044.2

Raw data
00,FF,FF,FF,FF,FF,FF,00,34,F7,01,00,01,00,00,00,01 ,1A,01,03,80,00,00,78,02,EE,95,A3,54,4C,99,26,
0F,50,54,FF,FF,80,31,40,45,40,61,40,71,40,81,80,D1 ,00,E1,C0,01,00,B8,CE,00,50,F0,70,5A,80,18,10,
8A,00,50,1D,74,00,00,1E,02,3A,80,18,71,38,2D,40,58 ,2C,45,00,50,1D,74,00,00,1E,00,00,00,FD,00,0F,
96,0F,87,3C,00,00,00,00,00,00,00,00,00,00,00,FC,00 ,55,53,42,20,43,61,70,74,75,72,65,0A,20,01,62

[Rookie_Mistake]

I also ran the Magewell USB Capture DVI Plus device through. It does not appear to support 1280x1024p60 natively, although it does support 1280x1024p75.




Monitor
Model name............... USB Capture
Windows description...... Generic PnP Monitor
Manufacturer............. MGW
Plug and Play ID......... MGW0206
Serial number............ 12345678
Manufacture date......... 2017, ISO week 1
Filter driver............ None
-------------------------
EDID revision............ 1.3
Input signal type........ Digital
Color bit depth.......... Undefined
Display type............. Monochrome/grayscale
Screen size.............. 480 x 270 mm (21.7 in)
Power management......... Not supported
Extension blocs.......... 1 (Unknown type)
-------------------------
DDC/CI................... n/a

Color characteristics
Default color space...... sRGB
Display gamma............ 2.20
Red chromaticity......... Rx 0.640 - Ry 0.330
Green chromaticity....... Gx 0.300 - Gy 0.600
Blue chromaticity........ Bx 0.150 - By 0.060
White point (default).... Wx 0.313 - Wy 0.329
Additional descriptors... None

Timing characteristics
Horizontal scan range.... 12-120kHz
Vertical scan range...... 25-120Hz
Video bandwidth.......... 170MHz
CVT standard............. Not supported
GTF standard............. Supported
Additional descriptors... None
Preferred timing......... Yes
Native/preferred timing.. 1920x1080p at 60Hz (16:9)
Modeline............... "1920x1080" 138.500 1920 1968 2000 2080 1080 1083 1088 1111 +hsync -vsync
Detailed timing #1....... 1920x1200p at 60Hz (16:9)
Modeline............... "1920x1200" 154.000 1920 1968 2000 2080 1200 1203 1209 1235 +hsync +vsync

Standard timings supported
720 x 400p at 70Hz - IBM VGA
720 x 400p at 88Hz - IBM XGA2
640 x 480p at 60Hz - IBM VGA
640 x 480p at 67Hz - Apple Mac II
640 x 480p at 72Hz - VESA
640 x 480p at 75Hz - VESA
800 x 600p at 56Hz - VESA
800 x 600p at 60Hz - VESA
800 x 600p at 72Hz - VESA
800 x 600p at 75Hz - VESA
832 x 624p at 75Hz - Apple Mac II
1024 x 768i at 87Hz - IBM
1024 x 768p at 60Hz - VESA
1024 x 768p at 70Hz - VESA
1024 x 768p at 75Hz - VESA
1280 x 1024p at 75Hz - VESA
1152 x 870p at 75Hz - Apple Mac II
1280 x 720p at 60Hz - VESA STD
1280 x 800p at 60Hz - VESA STD
1280 x 960p at 60Hz - VESA STD
1440 x 900p at 60Hz - VESA STD
1600 x 1200p at 60Hz - VESA STD
1680 x 1050p at 60Hz - VESA STD
1920 x 1080p at 60Hz - VESA STD
1920 x 1200p at 60Hz - VESA STD

Report information
Date generated........... 4/11/2022
Software revision........ 2.91.0.1043
Data source.............. Registry
Operating system......... 10.0.19044.2

Raw data
00,FF,FF,FF,FF,FF,FF,00,34,F7,06,02,4E,61,BC,00,01 ,1B,01,03,80,30,1B,78,07,EE,95,A3,54,4C,99,26,
0F,50,54,FF,FF,80,81,C0,81,00,81,40,95,00,A9,40,B3 ,00,D1,C0,D1,00,1A,36,80,A0,70,38,1F,40,30,20,
35,00,C4,8E,21,00,00,1A,28,3C,80,A0,70,B0,23,40,30 ,20,36,00,C4,8E,21,00,00,1E,00,00,00,FC,00,55,
53,42,20,43,61,70,74,75,72,65,0A,20,00,00,00,FD,00 ,19,78,0C,78,11,00,00,00,00,00,00,00,00,01,63

[Rookie_Mistake]

I also ran a Samsung HDMI computer monitor (that is able to decode the thermal camera DVI out) through the EDID app. It seems to be using a VESA standard mode.

1280 x 1024p at 60Hz - VESA STD



Monitor
Model name............... SMS24A350H
Windows description...... Generic PnP Monitor
Manufacturer............. Samsung
Plug and Play ID......... SAM07D6
Serial number............ 1513304119
Manufacture date......... 2011, ISO week 26
Filter driver............ None
-------------------------
EDID revision............ 1.3
Input signal type........ Digital
Color bit depth.......... Undefined
Display type............. RGB color
Screen size.............. 530 x 300 mm (24.0 in)
Power management......... Active off/sleep
Extension blocs.......... 1 (Unknown type)
-------------------------
DDC/CI................... n/a

Color characteristics
Default color space...... Non-sRGB
Display gamma............ 2.20
Red chromaticity......... Rx 0.631 - Ry 0.351
Green chromaticity....... Gx 0.334 - Gy 0.615
Blue chromaticity........ Bx 0.157 - By 0.051
White point (default).... Wx 0.313 - Wy 0.329
Additional descriptors... None

Timing characteristics
Horizontal scan range.... 31-81kHz
Vertical scan range...... 50-75Hz
Video bandwidth.......... 170MHz
CVT standard............. Not supported
GTF standard............. Not supported
Additional descriptors... None
Preferred timing......... Yes
Native/preferred timing.. 1920x1080p at 60Hz (16:9)
Modeline............... "1920x1080" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
Detailed timing #1....... 1280x720p at 60Hz (16:9)
Modeline............... "1280x720" 74.250 1280 1390 1430 1650 720 725 730 750 +hsync +vsync

Standard timings supported
720 x 400p at 70Hz - IBM VGA
640 x 480p at 60Hz - IBM VGA
640 x 480p at 67Hz - Apple Mac II
640 x 480p at 72Hz - VESA
640 x 480p at 75Hz - VESA
800 x 600p at 56Hz - VESA
800 x 600p at 60Hz - VESA
800 x 600p at 72Hz - VESA
800 x 600p at 75Hz - VESA
832 x 624p at 75Hz - Apple Mac II
1024 x 768p at 60Hz - VESA
1024 x 768p at 70Hz - VESA
1024 x 768p at 75Hz - VESA
1280 x 1024p at 75Hz - VESA
1152 x 870p at 75Hz - Apple Mac II
1152 x 864p at 75Hz - VESA STD
1280 x 800p at 60Hz - VESA STD
1280 x 960p at 60Hz - VESA STD
1280 x 1024p at 60Hz - VESA STD
1440 x 900p at 60Hz - VESA STD
1440 x 900p at 75Hz - VESA STD
1600 x 1200p at 60Hz - VESA STD
1680 x 1050p at 60Hz - VESA STD

Report information
Date generated........... 4/11/2022
Software revision........ 2.91.0.1043
Data source.............. Registry-Active
Operating system......... 10.0.19044.2

Raw data
00,FF,FF,FF,FF,FF,FF,00,4C,2D,D6,07,37,30,33,5A,1A ,15,01,03,80,35,1E,78,2A,BA,41,A1,59,55,9D,28,
0D,50,54,BF,EF,80,71,4F,81,00,81,40,81,80,95,00,95 ,0F,A9,40,B3,00,02,3A,80,18,71,38,2D,40,58,2C,
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[october262]

I guess the capture software you are using doesn't provide a log file with any clues about what went wrong or display any informative error messages when connected to L3 thermal camera.

Your capture devices won't capture HDCP-protected signals, so ordinarily, I'd suspect HDCP was the problem. However, the output from a camera shouldn't use HDCP, so that can't be it.

DVI is supposed to provide EDID data and use a handshake to negotiate the connection between the source device (camera) and sink device (capture device), just as HDMI does. Maybe that is where the problem lies. Unfortunately, I don't know how to diagnose it.

I don't think it is HDCP issue.

Both the DVI Plus and the HDMI 4K plus devices have no trouble recognizing a 1920x1080p60 panasonic camcorder.

With the Magewell DVI Plus, I can go from "no signal" to "unsupported signal" when I toggle the thermal camera video on-off.

What is frustrating is that old computer monitors have no trouble locking the signal, but neither Magewell USB capture device can get it.

try using the record desktop function with VLC Media player - https://www.vlchelp.com/how-to-record-desktop/

[usually_quiet]

try using the record desktop function with VLC Media player - https://www.vlchelp.com/how-to-record-desktop/

The only way Rookie_Mistake can watch the output from the L3 thermal camera is to connect the L3 thermal camera directly to a monitor. If Rookie_Mistake's capture devices won't accept the signal from the L3 thermal camera how is he going to get the output from the camera displayed on the computer's desktop?

[pandy]

You can sniff communication over DDC with help of logic analyzer (Saleae clone) then after capturing DDC communication you will be in position to mimic your display DDC communication - perhaps it is possible to use captured EDID so your HDMI capture device will be visible to camera in the same way as your display.

[Rookie_Mistake]

Update - I confirmed that when the thermal camera is in "DVI out" mode, it has a pixel clock right at 108.001MHz, which is pretty standard for SXGA 60 Hz.

A coworker had an HDMI to VGA converter box. With that, I was able to go camera-DVI-cable-HDMI-box-VGA-cable-dongle-Magewell USB Capture DVI plus.

The capture is a little awkward for field use and I will have to find a way to power the 5V2A ac-adapter for the converter box in the field, but it should work.

FYI, after this conversion, the analog SXGA video decodes as 1688x1067 scan area (typical for 1280x1024 SXGA is 1688x1066). Maybe I can solve the mystery and get to direct digital eventually.