VideoTexture: "RENDER_STATE" not dispatched

I'm currently playing around with the new video texture feature for stage3D — which is totally awesome, BTW! 😃

While I have managed to use the live video from the webcam, I could not play back any local or embedded file. When I try to display a video in "flv" format, I get the well-known "Error #3605: Sampler 0 binds an invalid texture". And when I use an "mp4" or "3gp" video (taken from here), the "RENDER_STATE" event is never fired, and thus I cannot use the texture.

Here's the code that I'm currently using:

VideoTextureExperiments.as

That's a Starling root class to be passed to the Starling constructor. The problem is not related to Starling; as I wrote above, it's simply that the RENDER_STATE event is never fired.

Could it be that the video format is simply not supported? Could you maybe post a link to a supported video?

Or is there anything else that jumps into anyone's eye — maybe I'm doing something horribly wrong? 😉

For reference, I'm using OS X Yosemite with the AIR 16 beta (16.0.0, build 214), and I tried that both in an AIR application and in the Flash projector.

Thanks a lot in advance for any help!