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annoying “stripes” when videotaping a computer screen
How can I eliminate those annoying stripes that appear on screen when I videotape a computer screen? I need to show the clicking on a link, the new page appearing, etc. but it looks bad. I want it to appear clean, sharp. Currently shooting in 24 frame. Is that my problem? Thanks for any help !
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6 Replies
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why dont you use some screen capturing software such as camtasia studio 2 or commotion 4 etc.. as appose to filming the screen?
Unless you were after an actual shot of more than just the screen itself…then your going to have to change some refresh rates etc
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The “Black Line” is caused by the raster update of the video monitor running at a different rate to your video camera. That is, your monitor’s probably being redrawn 75 times per second, but your camera’s taking 24 pictures per second. Higher end cameras have “Clearscan” functions which can eliminate this, and big budget productions have very expensive synchronisation systems to deal with it.
Experiment with changing your monitor’s refresh rate, and with the shutter speed of your camera, to reduce the effect. I doubt you will have any success at 24fps. Assuming you are shooting NTSC, try 30fps and a 60Hz monitor refresh rate with a high shutter speed. If PAL, try 25fps and 50 or 75 Hz.
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Is this a CRT or LCD screen? If it’s CRT, try LCD instead.
If you’re shooting video, rent a camera with ‘clear scan’
If you’re shooting film, just rent a sync box with the cam.
Chris Smith
https://www.sugarfilmproduction.com -
When I do videos for CD-ROM which involve demonstrating part of the CD, I just use the graphic elements of it instead of videotaping the screen. For a web page, hit Print-Screen and paste the image of the website into Photoshop, doctor up a cursor in AE, and just simulate the web page. Would be easier than trying to synchronize your camera to your monitor. Unless you have an LCD monitor handy. Then you can get that nice super-close-up pixel effect.
Clint
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As some of the above people have pointed out, it would be better to do a capture then to film a CRT monitor. But if you have to, find out if your camera has clear scan. If not and you are shooting 24p, change your shutter speed, sometimes at 24p a shutter speed of 72 can get it very close, you can then also change the refresh rate of the monitor itself, get the shutter speed to 72 and then see if you can match up the CRT with that freequency. You might have to play with different shutter speeds & freequencies, but it should work.
b
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[Brian24DP] “better to do a capture then to film a CRT monitor”
You mean an LCD, no?
Chris Smith
https://www.sugarfilmproduction.com
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