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Author Topic: Camera on drummer with screen behind him  (Read 2114 times)

John L Nobile

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Camera on drummer with screen behind him
« on: February 10, 2015, 02:36:28 pm »

I want to shoot a drummer (figuratively) who will be sitting in front of the screen that he will be projected on. The camera will be shooting it's own image as it's projected in real time.
I've never done this but will that cause any video feedback issues?
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Chris Clark

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Re: Camera on drummer with screen behind him
« Reply #1 on: February 10, 2015, 06:16:44 pm »

Depending on how close to the drummer the camera would be, could you "mask" behind him/her (basically a backdrop that would make the back of the video that instead)?

Although in all reality I'm presuming the screen would be much larger than the drummer, so in reality you'd only pick up a small fraction of the "infinite loop" I'm sure we all played with at one time in our lives. I've seen it done before and don't think it would be a huge issue.
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Jonathan Kok

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Re: Camera on drummer with screen behind him
« Reply #2 on: February 11, 2015, 11:02:10 am »

No 'feedback' other than the infinite loop. Note that due to video processing delay, the 'further' images will lag behind the 'closer' images.
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John L Nobile

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Re: Camera on drummer with screen behind him
« Reply #3 on: February 11, 2015, 11:21:08 am »

What is the "infinite loop" and how will affect the image?  I did a google search but that was useless.

This won't be happening till April but I wanted to research it first. I'm a video novice. The screen is 200" diag and will right behind him.
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Mark Olsen

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Re: Camera on drummer with screen behind him
« Reply #4 on: February 11, 2015, 02:21:39 pm »

What is the "infinite loop" and how will affect the image?  I did a google search but that was useless.

http://en.wikipedia.org/wiki/Video_feedback
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John L Nobile

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Re: Camera on drummer with screen behind him
« Reply #5 on: February 11, 2015, 02:45:28 pm »

Thanks for that link. I wanted to make sure that there's no damage done to the gear.I guess I'll have to do it to see what the actual effect is. Might be interesting for the obligatory drum solo.
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Scott Holtzman

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Re: Camera on drummer with screen behind him
« Reply #6 on: February 11, 2015, 03:07:12 pm »

I want to shoot a drummer (figuratively) who will be sitting in front of the screen that he will be projected on. The camera will be shooting it's own image as it's projected in real time.
I've never done this but will that cause any video feedback issues?

I don't know anything about your switcher but I do know years ago the Intergroup Switcher at a Trinity station (circa 1992) was able to edge out feedback pixels and background blend.  Very similar to a chroma keyer.

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Scott AKA "Skyking" Holtzman
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John L Nobile

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Re: Camera on drummer with screen behind him
« Reply #7 on: February 11, 2015, 03:18:09 pm »

I don't know anything about your switcher but I do know years ago the Intergroup Switcher at a Trinity station (circa 1992) was able to edge out feedback pixels and background blend.  Very similar to a chroma keyer.

I don't have a clue what you're talking about lol

Guess I'm going to have to educate myself if I'm going to use any video in our next show. But just enough to stay out of trouble.
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TJ (Tom) Cornish

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Re: Camera on drummer with screen behind him
« Reply #8 on: February 11, 2015, 03:26:49 pm »

I want to shoot a drummer (figuratively) who will be sitting in front of the screen that he will be projected on. The camera will be shooting it's own image as it's projected in real time.
I've never done this but will that cause any video feedback issues?
You won't damage video gear with video "feedback", you just get the infinite tunnel effect.  I agree with the others - that's probably unsightly enough to try to either figure out camera angles that won't hit the screen or put something behind the kit to block it.
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Scott Holtzman

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Re: Camera on drummer with screen behind him
« Reply #9 on: February 13, 2015, 02:55:59 am »

You won't damage video gear with video "feedback", you just get the infinite tunnel effect.  I agree with the others - that's probably unsightly enough to try to either figure out camera angles that won't hit the screen or put something behind the kit to block it.

The switcher is the device or software that selects the video signal output to the displays.  It is also where transition effects, titling etc. is done.  Chroma keying is the technique used in weather broadcasts and movie special effects to superimpose backgrounds.
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Scott AKA "Skyking" Holtzman
River Delta Audio is now:

Ghost Audio Visual Solutions, LLC
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