FMS2 EnhancedSeek not working with VP6?

Enhanced seek works quite differently with VP6 video stream that with Sorenson.
With Sorenson, FMS calculate the frame you request. It generates a keyframe in that position, followed by the regular difference frames.
With Vp6 stream, FMS does not calculate the intermediate keyframe anymore. To enhance scalability, programmers have decided for a different approach to the problem: FMS send the previous keyframe and then the intermediate difference frames changing on the fly the timestamp to the same, starting value. In this way, the player is forced to decode, as fast as it can, the frame sequence till the frame to which you have seeded. Starting from this frame, the movie play at the default rate. in short, it is the flash player who decode the stream till the required seeked frame. This approach may, sometime, leads to strange behaviours.

This is a work around but appears to work.

videoWindow.attachVideo(ns);
ns.play("some_video",0,35);
ns.seek(30);

In this example it starts at 0s seeks to 30s and plays to 35s
There is minimal delay vs just starting at the 30s mark but it does work.
I'm still trying to hunt down why just using ns.play isn't working.

Adam Walsworth

Update: I had the same file encoded with Sorenson codec and with the On2 VP6 code. For the first one the EnhancedSeek works just file, for the second one it doesn't work