I am tasked to create a video that has a transparent background.
Something like this - http://updates.html5rocks.com/2013/07/Alpha-transparency-in-Chrome-video
I came across a solution called JQuery See Thru - https://github.com/m90/jquery-seeThru
But before the plugin can work, I will need to append the alpha channel below the actual video. I have tried using track matte in AE but it doesn't work.
Any advice or any other solution to create alpha transparent video for html5?
Thank you very much.
This has nothing and really, really nothing to do with AE beyond rendering out the videos suitably, which is basic stuff. Watch a tutorial and read the help. Seriously.
To build on what Mylenium said, you need to render your video out of After Effects with an alpha channel. If you're looking to deliver a video for the web, it'd be best to render a lossless file out of AE (with Alpha) and use the Adobe Media Encoder to make the FLV with alpha.