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Trying to create a Walk-on video- can’t retain Transparenc

Posted: Sun, 11th Apr 2010, 3:04pm

Post 1 of 8

CBL

Force: 400 | Joined: 5th Mar 2010 | Posts: 4

CompositeLab Pro User

Gold Member

Trying to create a Walk-on video but can’t retain Transparent Background

I use Vegas Pro 8, but the result of the Chroma key is very poor. So I use CompositLab Pro to create a transparent Background (BG). I render the file with the Alpha Channel and next I use Moyea Flash Video Pro to convert to a FLV file with the Alpha Channel. Then the FLV file is imported into DHTML Popup Pro to create the final Walk-on Video. But, I lose the transparency --- I end up with a black BG instead of a transparent BG.

I can open the Rendered CompositLab file with Vegas Pro and use the Chroma Key to remove the Black BG and it works fine.

Why do I have to open the file in Vegas to get the Chroma Key to work.

Thanks,
Posted: Sun, 11th Apr 2010, 5:19pm

Post 2 of 8

spydurhank

Force: 1956 | Joined: 24th Jun 2008 | Posts: 1357

VisionLab User VideoWrap User FXpreset Maker Windows User FXhome Movie Maker

Gold Member

The black background means that the background is transparent.
You just need to make sure that you save with an alpha channel and you're good to go.
Posted: Sun, 11th Apr 2010, 9:20pm

Post 3 of 8

CBL

Force: 400 | Joined: 5th Mar 2010 | Posts: 4

CompositeLab Pro User

Gold Member

Thanks for your reply -- Trust me, I have saved the Alpha Channel, but I have to pull the CompositLab rendered file back into Vegas to successfully remove the background... I know the black background means that the file is transparent-- but DHTML Popup Pro does not recognize the transparency until I use the Chroma Keyer in Vegas Pro 8.

Any other ideas????

Thanks
Posted: Tue, 13th Apr 2010, 9:16am

Post 4 of 8

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

I'm not entirely clear on when you're losing the transparency. At what step does it happen?

What render and compression settings are you using in CompositeLab?
Posted: Tue, 13th Apr 2010, 12:52pm

Post 5 of 8

CBL

Force: 400 | Joined: 5th Mar 2010 | Posts: 4

CompositeLab Pro User

Gold Member

I lose the BG when the FLV file is imported into DHTML Popup Pro to create the final Walk-on Video.

I have checked this several times to make sure that I save the Alpha channel in each step. As I mentioned, I can open the file (after the CompositLab Chroma Keying) in Vegas Pro and use the Vegas Pro Chroma Key to remove the background -- then I can convert the .avi file to a FLV file and then reopen the FlV file in DHTML Popup Pro and I can get a transparent background.

Here is a list of my steps:

Step 1. Open Vegas Pro .avi file with subject on Green Background in CompositLab -- use chroma keyer to remove BG. Saved with Alpha Channel.

Step 2. Next, I open the file in Moyea Flash Video MX Pro and convert the .avi file to a FLV -- Yes. I save the file with the Alpha Channel.

Step 3. Then, I open the FlV file in DHTML Pro to create the final walk on video... Yes, the file is setup for Alpha Channel -- But it does not
work... I get a Black Background each time.

I don't understand ????
Posted: Tue, 13th Apr 2010, 12:57pm

Post 6 of 8

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker Windows User

FXhome Team Member

In that case, this sounds like an issue with Moyea Flash Video MX Pro or DHTML Pro to me, rather than CompositeLab.
Posted: Tue, 13th Apr 2010, 1:12pm

Post 7 of 8

CBL

Force: 400 | Joined: 5th Mar 2010 | Posts: 4

CompositeLab Pro User

Gold Member

If that is the case, why does it work when I take the .avi file back into Vegas Pro and use the Vegas Pro Chroma Keyer?

You asked for the Render settings:

Single file
DirectShow (.avi)
Retain Alpha Channel

Thanks for your help...
Posted: Tue, 13th Apr 2010, 1:47pm

Post 8 of 8

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

VisionLab User VideoWrap User PhotoKey 5 Pro User MuzzlePlug User PowerPlug User PhotoKey 3 Plug-in User FXhome Movie Maker FXpreset Maker Windows User

FXhome Team Member

What compression settings do you choose when you start the render?

Which AVI file are you taking into Vegas Pro?

Have you tried rendering to the Quicktime format with the Animation codec? That's what I tend to use if I need alpha (make sure you set to Millions+).