FORUMS: list search recent posts

green screen/chroma screen

COW Forums : Sony XDCAM - EX & Related

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
dano motley
green screen/chroma screen
on Aug 13, 2009 at 2:38:15 am

i have a green screen shoot with the ex 3. it is for a web site insert of a talking head. i was going to shoot in 1080i until the clients web designer told me that it will not look right unless i shoot it in sd, based on his experience.

anyone have any experience with this...or what setting on the ex3 works best?



thanks in advance,

dano



Return to posts index

Michael Palmer
Re: green screen/chroma screen
on Aug 13, 2009 at 2:41:29 am

I would disagree with the SD as you have a great HD camera, I would choose 1080 30p not 60i.


Good Luck
Michael Palmer


Return to posts index

dano motley
Re: green screen/chroma screen
on Aug 13, 2009 at 2:50:17 am

mike,

the web designer complained about some black banding if you were to use an hd setting. maybe using 1080p 30 (as you suggest)would not have this effetc?

thanks for the fast response to my question...

dano



Return to posts index


Michael Palmer
Re: green screen/chroma screen
on Aug 13, 2009 at 3:58:12 am

I believe most post personnel would like a progressive image over an interlaced image to composite. If you are referring to a letterbox black banding top and bottom I would use the 4:3 aspect ratio markers to frame with so when you are exporting as SD you will get a full 4:3 image . What is your delivery?

Good Luck
Michael Palmer


Return to posts index

Craig Seeman
Re: green screen/chroma screen
on Aug 13, 2009 at 4:42:25 am

For chromakey it's best to shoot progressive because the edges will be cleaner.

For web it's best to shoot progressive because computer screens are progressive and you avoid having to deinterlace.

Black banding . . . apparently the web designer does not know that 16:9 images encoding at that aspect ratio has no bands and, alternatively, can be cropped to 4:3 as Michael notes but these days 16:9 is becoming common.

Please show the web designer a movie trailer on Apple's site

http://www.apple.com/trailers/
Play any HD clip.



Return to posts index

Greg Ball
another question similar to this
on Aug 13, 2009 at 7:06:57 pm

I'm shooting a series of presentations that will be used primarily on a client's website but will also end up on DVDs. These presentations have tons of PowerPoint Slides provided by the presenters. We're shooting the presenters on an EX1 How would you edit this? Wide screen or 4:3? Wouldn't the powerpoint need to be stretched?

I imagine that the file size will be 320 X 240. Would 16:9 be 320 X180? Would that be too small?



Return to posts index


Craig Seeman
Re: another question similar to this
on Aug 13, 2009 at 7:23:52 pm

16:9 works fine on DVD as long as it detects the flag for it.
There's no one answer for PowerPoint. It depends on the readability of the slides. You can have them in a "frame" or you could zoom in to key points if you're working in 16:9

340x180 is 16:9 but IMHO that's way too small if readability is important on the web. YouTube and Vimeo show full 1280x720p these days. If the viewer has the bandwidth then that can play without issue.

You must understand fundamentally there is no "correct" answer for an aesthetic question. You need to make readability decisions. You need to know what your bandwidth target is on the web to determine frame size/data rate.

If you don't have answers for the above you should run tests first.



Return to posts index

Greg Ball
Re: another question similar to this
on Aug 13, 2009 at 7:36:55 pm

Thanks Craig. The other issue is these presentations will be 90 minutes I'll break them down to 45 minute segments. I think full size will create huge file sizes. The audience will be industry specific doctors, so there's no way of knowing what the bandwith should be.



Return to posts index

Craig Seeman
Re: another question similar to this
on Aug 13, 2009 at 7:58:26 pm

At that length you might consider streaming server if you can afford it.
With progressive download, if they quit part way through they have to come back and rebuffer to that point.

If these are MD doctors (as opposed to the kind who are college teachers) they should have the money for the bandwidth but a lot depends on where they live as well.

In my area consumer can easily get 5000kbps down and some services offer 101,000kbps down for $99/month. Some rural areas don't offer more than 768kbps down. You're going to have to decide and part of the potential audience may be unhappy or you can offer multiple versions or, with streaming, the server may have speed / data rate adjustment.



Return to posts index


Clint Fleckenstein
Re: green screen/chroma screen
on Aug 13, 2009 at 3:22:44 pm

I disagree as well. When you're doing chromakey work you want as much information in your picture as possible. Two ways you can defeat this are a) shooting SD, and b) shooting interlaced.

I think your web guy is like many, who doesn't know the difference of different "flavors" of video. Most people who see a 16x9 SD stream probably assume it's HD because it's "wide." So he doesn't want to have a letterboxed video? No problem, shoot it with the best resolution possible and crop to 4x3.

This camera rules for chromakey work. Use the tool as it's intended. Frame it for 4x3 if that's what he requires (you can turn on the guides in your viewfinder if necessary) and enjoy a quick, easy key.

Cf


Return to posts index

dano motley
Re: green screen/chroma screen
on Aug 13, 2009 at 9:11:51 pm

just got back from the shoot and as usual...you guys are right...the web dud was a certified idiot when i met him in person. shot it progressive, put it in to key and it looks great. thanks so much for the good info...now the only question i have for your genuises is...how do you get the image to key on a web site with no backround at all. its almost like the working web page is the backround and the image is keyed in a corner with the talking head having no backround.....howdoyoudoit?

thanks again,

dano



Return to posts index

Craig Seeman
Re: green screen/chroma screen
on Aug 13, 2009 at 9:20:59 pm

That part has to built in Adobe Flash.

You'll probably need to export in a format that preserves the alpha channel unless the key itself can be built in Flash.

http://www.adobe.com/products/flash/

You'll have to ask your Flash designer to do that. I hope it's not your web page designer as history shows this person is likely to give you the wrong info.




Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]