exporing with alpha channel

[SpongeClock SquarePants]

Here's the deal
I want to export a short animation as a H264 quicktime mov file with alpha channel.

In the export setting there's this cool checkbox: Ignore stage color, which i checked.



After exporting the .mov play fine however i see no alpha channel whatsover, there's a black background behind my animated content.

WTF am i doing wrong or WTF is the exporting doing wrong???

using Flash CS 4 btw

[SpongeClock SquarePants]

FUCK

from the adobe help site:

Ignore stage color
    Creates an alpha channel using the stage color. The alpha channel is encoded as a transparent track, letting you overlay the exported QuickTime movie on top of other content to alter the background color or scene.

    To create a QuickTime video with an alpha channel, you must select a video Compression Type that supports 32-bit encoding with an alpha channel. Codecs that support this are Animation, PNG, Planar RGB, JPEG 2000, TIFF, or TGA. You must also select Million of Color+ from the Compressor/Depth setting. To set the compression type and color depth, click the Settings button in the Video category of the Movie Settings dialog box.