Recording CRT Computer Monitors
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Date: 2022-04-14
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Comments and reviews: 10
singhcr
Thanks for this! Very helpful. One question: I want to do an animation cel painting video where I am using a lightbox and as I live in the US it refreshes at 60 Hz. I noticed that shooting with 1/60th sec shutter speed -30fps seems to reduce the flickering more than 1/60th - 24fps, but I really wanted to keep 24fps for more of a cinematic feel. Is there a reason why this is so? Could I perhaps record at 30fps and then convert to 24fps in post to join the rest of my footage sans lightbox at 24fps? I could try the polarizer idea too, I hadn't considered that. Thanks for showing a bit of how you tackle these issues, I really appreciate the effort you take in making your videos look and sound great in addition to the entertaining content and host: )
I have a Panasonic FZ1000 camera, perhaps it has a synchro shutter feature as well because if the lightbox was truly 60 Hz it should go away completely. Maybe it's like 60. 1 Hz and when I blow it up on my 65- TV downstairs especially I can clearly see it.
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Thanks for this! Very helpful. One question: I want to do an animation cel painting video where I am using a lightbox and as I live in the US it refreshes at 60 Hz. I noticed that shooting with 1/60th sec shutter speed -30fps seems to reduce the flickering more than 1/60th - 24fps, but I really wanted to keep 24fps for more of a cinematic feel. Is there a reason why this is so? Could I perhaps record at 30fps and then convert to 24fps in post to join the rest of my footage sans lightbox at 24fps? I could try the polarizer idea too, I hadn't considered that. Thanks for showing a bit of how you tackle these issues, I really appreciate the effort you take in making your videos look and sound great in addition to the entertaining content and host: )
I have a Panasonic FZ1000 camera, perhaps it has a synchro shutter feature as well because if the lightbox was truly 60 Hz it should go away completely. Maybe it's like 60. 1 Hz and when I blow it up on my 65- TV downstairs especially I can clearly see it.
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Pavel
Heya. Love the show. I'm full nerd showing the 14 year old cool tech. My first PC i bought with part time money in 95 was the P100 (8GB hard drive 8MB ram no vid card with 14. 4bps modem. [still have the PC]) and ended up buying a IDE zip drive (few years later) due to studying computer sci at uni (we studies JAVA 1. 0 as the first Uni at Australia studying Java. yeah. i know. second year sucked. I now work in Policing in Australia. Anyhow. Whenever i see CCTV footage of me (usually top down) i go -oh my god. my hair(79 child)-. Anyhow. I went full buzz cut number 2 all over embracing the lake of no hair. You need to. Please. Keep the beard but shave the hair. You will be -Cool +15- for me. Better still. Embrace it and do a vid of shaving. Don't go full Babbish. go short number 2.
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Heya. Love the show. I'm full nerd showing the 14 year old cool tech. My first PC i bought with part time money in 95 was the P100 (8GB hard drive 8MB ram no vid card with 14. 4bps modem. [still have the PC]) and ended up buying a IDE zip drive (few years later) due to studying computer sci at uni (we studies JAVA 1. 0 as the first Uni at Australia studying Java. yeah. i know. second year sucked. I now work in Policing in Australia. Anyhow. Whenever i see CCTV footage of me (usually top down) i go -oh my god. my hair(79 child)-. Anyhow. I went full buzz cut number 2 all over embracing the lake of no hair. You need to. Please. Keep the beard but shave the hair. You will be -Cool +15- for me. Better still. Embrace it and do a vid of shaving. Don't go full Babbish. go short number 2.
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Iris
Can I add something extra: do not compare DSLR camera's to videocamera's, because the video feature needs to be considered a luxury extra, where as actual videocamera's (and in the really professional ones, especially) the sensor-readout technology causes a lot less of the flickering usually seen in DSLR's.
Most DSLR's use rolling shutter readout, while good videocamera's use a global shutter. Rolling shutter technology is much, much more prone to flickering screens due to the fact that it reads out pixel rows continuous while building the image, instead of reading a whole frame and storing it.
Flickering is caused due to the fact that the refreshing of the screen is running over the screen while the sensor is being readout in much the same way as well.
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Can I add something extra: do not compare DSLR camera's to videocamera's, because the video feature needs to be considered a luxury extra, where as actual videocamera's (and in the really professional ones, especially) the sensor-readout technology causes a lot less of the flickering usually seen in DSLR's.
Most DSLR's use rolling shutter readout, while good videocamera's use a global shutter. Rolling shutter technology is much, much more prone to flickering screens due to the fact that it reads out pixel rows continuous while building the image, instead of reading a whole frame and storing it.
Flickering is caused due to the fact that the refreshing of the screen is running over the screen while the sensor is being readout in much the same way as well.
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Morahman7vnNo2
Here's an idea I use to take pictures of books with glossy covers:
_Adjust the angle of the subject itself. _
Sound like a decent idea?
I know that this is a lot easier to us do books than heavy cathode ray tube based displays, but it is manageable. Here at 14: 39 for example, I know this glare was done deliberately, however, still the monitor could have been pointed lower and the angle and placement of the camera adjusted accordingly.
Also, for capturing footage when (you yourself are) in front of the CRT monitor, I would recommend angling yourself -45 degrees right of the monitor-, with the camera farther away, zoom in, -45 degrees left of the monitor. - Think X/Y pattern for stereo mic placement.
Hope someone found this useful.
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Here's an idea I use to take pictures of books with glossy covers:
_Adjust the angle of the subject itself. _
Sound like a decent idea?
I know that this is a lot easier to us do books than heavy cathode ray tube based displays, but it is manageable. Here at 14: 39 for example, I know this glare was done deliberately, however, still the monitor could have been pointed lower and the angle and placement of the camera adjusted accordingly.
Also, for capturing footage when (you yourself are) in front of the CRT monitor, I would recommend angling yourself -45 degrees right of the monitor-, with the camera farther away, zoom in, -45 degrees left of the monitor. - Think X/Y pattern for stereo mic placement.
Hope someone found this useful.
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LMacNeill
I'm 49, so I can no longer hear the 15. 750 kHz horizontal refresh on older computer monitors and CRT televisions, but I can remember when I was a kid being able to hear it. It was especially bad if a computer monitor was on, but didn't have an input signal, because someone had turned off the computer but forgot to turn off the monitor - they'd -really- crank out a loud whine then. I'd walk around the the computer lab at school and turn off those monitors -- I could hear them that well back then, that I could pinpoint from across the room where the noise was coming from. LOL. Definitely can't hear those frequencies any more though. I'm lucky to hear anything over 10kHz, and only then if it's -really- loud. Too damn many rock concerts in my 20s.
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I'm 49, so I can no longer hear the 15. 750 kHz horizontal refresh on older computer monitors and CRT televisions, but I can remember when I was a kid being able to hear it. It was especially bad if a computer monitor was on, but didn't have an input signal, because someone had turned off the computer but forgot to turn off the monitor - they'd -really- crank out a loud whine then. I'd walk around the the computer lab at school and turn off those monitors -- I could hear them that well back then, that I could pinpoint from across the room where the noise was coming from. LOL. Definitely can't hear those frequencies any more though. I'm lucky to hear anything over 10kHz, and only then if it's -really- loud. Too damn many rock concerts in my 20s.
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Dosgamert
I'm really happy to hear all of this, and that I know what you're talking about, since I know how camera's work. I work with people (I kid you not) that do not know the difference between f1/25 and 25 frames per second (fps. And yes, I'm talking about the videoproduction team. In Dutch a Aperature is Diafragma, so that can be confusing too. So when setting up the camera, the person is just winging it. After filming a darker scene, h just keeps turning wheels and sliding options untill the screen lightens up. See! I don't need all of these lights. And after importing footage asking himself why his footage is so grainy. I stopped explaining what ISO does.
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I'm really happy to hear all of this, and that I know what you're talking about, since I know how camera's work. I work with people (I kid you not) that do not know the difference between f1/25 and 25 frames per second (fps. And yes, I'm talking about the videoproduction team. In Dutch a Aperature is Diafragma, so that can be confusing too. So when setting up the camera, the person is just winging it. After filming a darker scene, h just keeps turning wheels and sliding options untill the screen lightens up. See! I don't need all of these lights. And after importing footage asking himself why his footage is so grainy. I stopped explaining what ISO does.
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warrax111
Thank you LGR for this video, you've inspirated me about some projects about old 90's computers and games, particulary LAN parties. Those computers you have, look awesome, and also recorded image on them. Never seen so good looking images of CRT monitors, it looked almost like real, and colors were shining live, like you are looking at real monitor and DOS games. Felt urgue to join, and play some oldies, like when I see real old computer with DOS game on screen and noone behind. That feeling from your images was like in reality, just sit behind computer and enjoy some oldies.
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Thank you LGR for this video, you've inspirated me about some projects about old 90's computers and games, particulary LAN parties. Those computers you have, look awesome, and also recorded image on them. Never seen so good looking images of CRT monitors, it looked almost like real, and colors were shining live, like you are looking at real monitor and DOS games. Felt urgue to join, and play some oldies, like when I see real old computer with DOS game on screen and noone behind. That feeling from your images was like in reality, just sit behind computer and enjoy some oldies.
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Anders
Some clarification.
Shutter speed is not Framerate
Framerate of the camera is measured in fps and shutter speed is measured in fractions of a second. 1/60 shutter speed and 60 fps framerate would mean the shutter is open for the entire frame (shutter angle 360 deg) which is probably the most important thing. Most cameras will default to something like 180 degrees shutter angle 1/(2xframerate) seconds shutter speed and that is why you get things like half the screen being dim
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Some clarification.
Shutter speed is not Framerate
Framerate of the camera is measured in fps and shutter speed is measured in fractions of a second. 1/60 shutter speed and 60 fps framerate would mean the shutter is open for the entire frame (shutter angle 360 deg) which is probably the most important thing. Most cameras will default to something like 180 degrees shutter angle 1/(2xframerate) seconds shutter speed and that is why you get things like half the screen being dim
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CreativeType
I was recently working on a music video and had all of these frustrations. We were using a big projector to project text/fire onto a persons chest. Depending on the video that we used it would capture flickering while a different video would work perfect. We did 24FPS video and recorded at 180 shutter angle. I tried changing so many settings, tried so many different FPSs for both the camera and the projector. Altogether it was super difficult
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I was recently working on a music video and had all of these frustrations. We were using a big projector to project text/fire onto a persons chest. Depending on the video that we used it would capture flickering while a different video would work perfect. We did 24FPS video and recorded at 180 shutter angle. I tried changing so many settings, tried so many different FPSs for both the camera and the projector. Altogether it was super difficult
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Robert
Why are you using a camera to record your monitors? I can understand when you are doing a display review. You can keep the camera on you and use a signal splitter to record direct from the computer display output. at some point you are sending a signal to utube that is digital. you do not need to record from the screen. yes you can review the monitor display but your reviews are of the computer and software, not the display. so why?
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Why are you using a camera to record your monitors? I can understand when you are doing a display review. You can keep the camera on you and use a signal splitter to record direct from the computer display output. at some point you are sending a signal to utube that is digital. you do not need to record from the screen. yes you can review the monitor display but your reviews are of the computer and software, not the display. so why?
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