From: "Rick Gerard" <AE-List@media-motion.tv>
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Subject: Re: [AE] Playing Back Video with Transparent BG
Date: Sun, 4 Mar 2018 06:27:21 -0800
References: <list-6413715@media-motion.tv>
To: After Effects Mail List <AE-List@media-motion.tv>
In-Reply-To: <list-6413715@media-motion.tv>
Message-Id: <17D697A2-0CA1-4802-8012-3134BA3D30F5@mstrg.com>
Sender:  Rick Gerard <ae@mstrg.com>

If you are playing those movies in a media player on a website you are =
not seeing through the movies so the background of the website is =
showing through. What you are seeing is a representation of the =
transparency grid that you see in an app like Photoshop, Illustrator or =
After Effects. They create that grid as a graphic and put it at the =
bottom of the layer stack and render a file for the web. Then the =
product is delivered in a format that supports transparency.

If you could download open one of the sample clips from a site like =
Shutterstock and you put that clip in an AE project or checked for an =
alpha channel you would see that there is no transparency in the video.=20=


If you purchased one of those clips with a transparent background and =
loaded it in any media player the transparent part of the clip would be =
black because there is nothing there to see. You would not see your =
desktop through the media player. That=E2=80=99s not how media players =
work.

I do not recall ever seeing a desktop behind Quicktime Pro either. No =
video =3D no pixels =3D black background.

I hope this helps.=20

> On Mar 4, 2018, at 2:50 AM, Peter Matulavich <AE-List@media-motion.tv> =
wrote:
>=20
> Thanks everyone. Unfortunately I don't have QT Player 7 Pro to =
experiment, but even if I did, would I be able to save the movie so that =
the transparent checkerboard pattern would appear by someone playing the =
movie whose player was NOT set to those settings?  I don't think I =
could, so let me rephrase my original question somewhat:  I've seen =
movies being offered for sale on stock footage website (like =
Shutterstock)  with those kinds of transparent backgrounds.  According =
to the specs on the site, they are rendered in the Animation codec.  =
When I click on the movies on that site,  are they playing in Flash?   =
How did the creators of those movies save movies with transparent =
backgrounds so that they can be seen by anyone clicking on the movies at =
that site?
>=20
> Pete
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