H264 live encoding in Flash Player 11 slowly?

Question

Hi,
I am using the new Flash Player 11 ability to encode H264 video within the Flash Player. I am streaming the webcam via RTMP to a FMS. I am using the following settings:
H.264 Baseline
Level 5.1
Keyframe freq. 5 seconds
25 FPS
Input size: 1280 x 720 (720p)
Output size: 1280 x 720 (720p)
Bit Rate: 1000Kbps
When I am using these settings with FMLE 3.2, the final stream plays very fluent with a good amount of FPS. If I am using Flash Player 11 for the encoding job instead, the final video is not as fluent as before and achieves less FPS (maybe 5 FPS).
So the question is: is Flash Player 11 not as good as FMLE 3.2 or am I missing some configuration? FP11 should be capable of encoding and streaming a fluent 720p stream, shouldn't it?
Thanks a alot.
Best
Malte

Answer 1

Addition: I've found out that the incoming bandwith is very constant when streaming and encoding from FMLE. It stays relatively constant around 1500 kbps:
When I am using the Flash Player 11 for encoding and streaming the incoming bandwith looks like the rocky mountains. The incoming bandwith jumps between 1000 and 6000 kbps during the whole stream:
That is definitely the reason why it "stutters" when using Flash Player 11. But I have no idea what I am doing wrong.
I am using these encoding settings for FP11 ...
var videoStreamSettings : H264VideoStreamSettings = new H264VideoStreamSettings();
videoStreamSettings.setKeyFrameInterval(5);
videoStreamSettings.setMode(1280,720, 25);
videoStreamSettings.setProfileLevel(H264Profile.BASELINE, H264Level.LEVEL_5_1);
videoStreamSettings.setQuality(1000000, 0);
... and these settings for the camera:
var camera : Camera = Camera.getCamera(0);
camera.setQuality(1000000, 0);
camera.setKeyFrameInterval(5);
camera.setMode(1280, 720, 25);
Any idea why the bandwith is not constant in FP11? The function camera.setQuality() should do the job, right (http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/media/Camera.html #setQuality%28%29)?
Thanks
Malte