You know when you try to film the TV, lines appear across the screen.
What causes this? And are there any tricks to minimise this?
2007-09-13 20:03:50 · 8 answers · asked by gamegirl 2 in Consumer Electronics ➔ TVs
Well, BOTH the TV and the camera create the picture using 30 frames of picture a second.....
But they need to be synchronized together to make those lines disappear...
And the only thing that I know that can do that is an "In house syncing system" and some professional cameras with external sync input and professional monitors with that same input..
B&H Video does sell some studio cameras for $9000 to $12,000 that might actually have the sync input.....but I'd call them 1st and let them set you up with a camera, synced-TV and sync-generator, along with the equipment to strip the sync off off what you're trying to record....
You might only have about $20,000 into a system like that.....
Of course, I'd personally just record it with a $90 DVD burner or Tivo it....
2007-09-13 22:54:57 · answer #1 · answered by Anonymous · 2⤊ 2⤋
Actually, the frame rate of standard home video cameras and broadcast TV are 29.97 frames per second. Each frame consists of two fields, so field rate is twice as fast. In theory then you should be able to take video of the TV screen, but in practice you will get a good picture only if the frame rates are synchronized. Otherwise you will get a picture of only a part of the frame; if the video frame starts after the TV frame does that produces a horizontal line which will move up or down in the picture.
I assumed you meant video, but you said "film"; if it really is a film camera, the problem is worse, since standard film rate is 24 frames per second, and can never be synchronized with a TV.
2007-09-14 03:20:40 · answer #2 · answered by gp4rts 7 · 4⤊ 1⤋
The screen on a t.v or PC refreshes faster then the video camera can record. So if you get an much more expensive camera you can get around this but you may need to spent over $10000 I really have no idea.
So lets say the t.v shows 300 frames per second and the camera can only record 200 frames per second theses lines or other glitches will be present. But those figures about are only examples I have no idea what the real ratio is.
Yes maybe Justin Bass is right and its the other way around?
But Hollywood camera use faster frame rates then normal cameras I believe and they can record the t.v just fine.
2007-09-14 03:08:51 · answer #3 · answered by SummerRain Girl 6 · 2⤊ 2⤋
Look this is easy ! I have recorded whole shows on my Video Camera, go into the menu on your camera and set the frame rate to 50 FPS or if in USA you can try 60FPS , anyway the proof of the pudding is in the eating just set your cams to 50 or 60 and look at the TV screen through the view finder ! you will see a perfect pic with no lines . Works on a still camera too just set shutter to to 1/50 sec and try it !!!
Cheers Pete
2007-09-14 03:33:35 · answer #4 · answered by Realist 2006 6 · 3⤊ 1⤋
I've never noticed this when I video a TV screen, and there's no reason why it should happen. Are you using a digital video camera (far inferior to analogue for this purpose)?
2007-09-14 13:02:15 · answer #5 · answered by Do not trust low score answerers 7 · 0⤊ 0⤋
Im pretty sure its caused because the frame rate of the camera is higher than that of the TV. That means the camera picks up images faster than the TV displays them, and thus there are gaps on the film. Uh.. Dunno how to solve it. I don't think TV's come with higher frame rates. I used my normal picture camera (with a video option) and it worked just fine, probably because it has a slower frame rate about equal to that of my TV.
2007-09-14 03:09:25 · answer #6 · answered by Justin Bass 2 · 1⤊ 2⤋
This is what the human naked eye cannot see. The same goes for computer screens. I don't know what causes it, and I don't know any tricks.
2007-09-14 03:06:42 · answer #7 · answered by Anonymous · 0⤊ 3⤋
a hi definition tv will eliminate these lines
2007-09-14 03:07:58 · answer #8 · answered by fantasie66 3 · 0⤊ 4⤋