I have created a short (<3 seconds) video comprised of 2 layers. Each layer was filmed as a green screen, and I used Keylight in After Effects CC to create a transparent background. My ultimate objective is to use the clip to create a transition for use in ProShow Producer, as described in the link http://www.youtube.com/watch?v=qg74Os8Y2wU. To do this, I need the main video file, and a second file containing only the alpha channel. Any ideas how to do this?
I have used Adobe Media Encoder to output a FLV, and told it to Encode Alpha Channel, as was suggested, but I only get the one file (the main video). How do I get the alpha file?
I am using AE CC. All the discussions I have been able to find on this subject are several years old and refer to an apparently much changed interface.
Choose Alpha from the Channels menu in the Output Module Settings dialog box.