How do you make a video with a transparent background?
by Borba Fett
on
Nov 7, 2007 at 7:18:47 pm
I've spent the better part of the last 24 hours reading every forum I could find on this subject. But I'm still at square one. What I'm trying to achieve in the end is an swf file (flash) with a transparent background so I can put it on my websites homepage and have my actual website as the background. (The video is of me talking)
So last night I used my DVX100a and shot a 1-minute clip in front of a true green screen. I went into Vegas and used the chroma keyer to remove the green background. (Which made it look like a dark blue background) I chose an uncompressed .avi without the alpha channel as my rendering method.
I could go on with the details, but it's a mess. I just want to render the video out with a transparent background so I can bring it into flash and make an swf out of it with a transparent background.
Re: How do you make a video with a transparent background? by DSE/Spot on Nov 7, 2007 at 8:26:44 pm
1. Shoot
2. Use Chromakey, Mask tool, or secondary color corrector to create transparent areas.
3. Render as uncompressed avi and in Custom, select the "render Alpha Channel and Create OpenDML.
This will give you the transparent channel you want. Only a 32bit file can carry the alpha channel.
You could also output a sequential PNG with transparency.
Douglas Spotted Eagle
VASST
Certified Sony Vegas Trainer
Aerial Camera/Instructor
Re: How do you make a video with a transparent background? by Holly O'Neil on May 21, 2008 at 9:05:32 pm
Hello Borba Fett,
I am in search of the same thing you were about creating a transparent background "on" my chroma key green screen in Vegas. We want to also import it into flash. I see the answer you got but it didn't work for us. Do you have any further insight?
The part selecting "render Alpha Channel" was greyed out and already checked it appeared. That was the only part of the directions we weren't able to influence.
Any suggestions? Thank you so very much, in advance, Holly
Re: How do you make a video with a transparent background? by Douglas Spotted Eagle on May 21, 2008 at 10:38:04 pm
If you want to import it to Flash, you'll need to use the Uncompressed template, with the transparency enabled. There are other workflows, but this is the best way we've found.
http://www.liveoutloud.com/eventsAboutTeleseminars.php
Douglas Spotted Eagle
VASST
Certified Sony Vegas Trainer
Aerial Camera/Instructor
Re: How do you make a video with a transparent background? by Holly O'Neil on May 22, 2008 at 2:16:49 pm
Thanks so much. The color picker (eyedropper?) did take out the green. I rendered as uncompressed AVI. Where is the transparency enabler? In Flash? If so, where in Flash? Our Flash person doesn't know.
Re: How do you make a video with a transparent background? by Lee Bateman on May 28, 2008 at 10:25:39 pm
I am still having trouble where is the transparent setting? I have used crhoma keyer for projects before but not a transparent background for a video. I have tryed all suggestions above and I am not sure what to try next.
Thank you
Lee
Re: How do you make a video with a transparent background? by Edward Troxel on May 29, 2008 at 12:15:45 pm
You have to render to a format that can handle the alpha channel. Try rendering to Uncompressed AVI, go into the preferences, and make sure the option to include Alpha Channel is turned on.
Re: How do you make a video with a transparent background? by Holly O'Neil on May 29, 2008 at 1:44:46 pm
Well, we had success this way. Open the video from the chroma keyer movie icon on the video. It is the little icon on the bottom right. It opens up all kinds of options. It's the Video Event FX button. Then select the Chroma Keyer option. Then use the eydropper tool to take away green (or whatever color) background. You can even do this on the preview screen. Then to adjust the thresholds appropriately go ahead and place some video underneath the chroma key video to move thresholds till you get the best look. Then go ahead and delete that video. Then render as: Video for Windows AVI, use default template- uncompressed, then choose custom setting and then choose video rendering quallity best, then select the Video settings button and set at 720x480, field order none (progressive scan) and make sure render alpha channel (uncompressed window formats only) and create an OpenDML are checked. Then render. Voila! Thanks Douglas Spotted Eagle, Holly O'Neil
Re: How do you make a video with a transparent background? by Holly O'Neil on May 29, 2008 at 1:46:45 pm
Well, we had success this way. Open the video from the chroma keyer movie icon on the video. It is the little icon on the bottom right. It opens up all kinds of options. It's the Video Event FX button. Then select the Chroma Keyer option. Then use the eydropper tool to take away green (or whatever color) background. You can even do this on the preview screen. Then to adjust the thresholds appropriately go ahead and place some video underneath the chroma key video to move thresholds till you get the best look. Then go ahead and delete that video. Then render as: Video for Windows AVI, use default template- uncompressed, then choose custom setting and then choose video rendering quallity best, then select the Video settings button and set at 720x480, field order none (progressive scan) and make sure render alpha channel (uncompressed window formats only) and create an OpenDML are checked. Then render. Voila! Thanks Douglas Spotted Eagle, Holly O'Neil
