Live rtmp dynamicstreamingvideosource with spark VideoPlayer, picks lowest bitrate stream

Hi,

I'm publishing 3 live streams on a FMS, bitrates: 1000, 2500, 4000.

As the video player i use the spark VideoPlayer. According to the documentation i can use dynamic streaming by assigning the source property to this:

<s:DynamicStreamingVideoSource id="myvid"
    host="rtmp://95.211.0.xx/live/">
    
     <s:DynamicStreamingVideoItem id="stream_1" streamName="stream_1" bitrate="1000" />
     <s:DynamicStreamingVideoItem id="stream_2" streamName="stream_2" bitrate="2500" />
     <s:DynamicStreamingVideoItem id="stream_3" streamName="stream_3" bitrate="4000" />
 
</s:DynamicStreamingVideoSource>

My problem is that whenever i start the player it always streams the lowest bitrate. When i set myvid.initialIndex = 2, it starts with the best stream, 4000 bitrate, but the quality quickly falls to 1000 kpbs. (I have enough bandwidth)

What am I doing wrong? Does the FMS need some additional configuration?

Any help will be much appreciated..

kind regards,

Arjen Veneman.