H264 video published with FP11 to FMS4.5 not playing anywhere else

I have created an swf where I can record the webcam picture as H264 video to a FMS 4.5 (I am using the developer version).

My code is looking like this:

var h264Settings = new H264VideoStreamSettings();

h264Settings.setProfileLevel("baseline", "1.2");

stream.videoStreamSettings = h264Settings;

stream.publish("mp4:mystream.f4v, "record");

I can then replay the video from FMS just fine, but if I try to copy the video from the FMS application directory into a local project and try to play the video with the FLVPlayback component, or with the Adobe Media Player, it is not playing at all.

Is this to be expected? Can't I record a webcam video with FMS in H264 and use that video later without FMS?