OSMF Bitrate Autoswitching for DynamicStreamingResource doesn't work

Question

Hi 
I'm having trouble getting dynamic streaming resources to automatically switch bitrates during playback. This mainly affects MP4 type videos.
The video stream being played stays at the same bitrate forever and never switches despite the network speed being more than adequate.
This problem only occurs when I construct the DynamicStreamingResource manually in the code.
When I use a MediaFactory to read a F4M video stream, it is able to properly auto switch bitrates appropriately when playing back.
I am manually constructing the DynamicStreamingResource in the code and pulling the video sources from a 3rd party web service. I'm placing these video file paths and their respective bitrates into individual DynamicStreamingItems which are then placed into the DynamicStreamingResources' resource vector.
This is what the DynamicStreamingResource object would contain:
DynamicStreamingResource()
Vector[0] = new DynamicStreamingItem(“rtmp://video1.mp4”, 100)
Vector[1] = new DynamicStreamingItem(“rtmp://video2.mp4”, 200)
Vector[2] = new DynamicStreamingItem(“rtmp://video3.mp4”, 300)
Vector[3] = new DynamicStreamingItem(“rtmp://video4.mp4”, 400)
After I attach MetaData for an Akamai authentication token, I then feed the DynamicStreamingResource object into a MediaFactory that has loaded the AkamaiBasicStreamingPlugin because the videos are hosted through Akamai.
The MediaFactory class returns a MediaElement that is Akamai authentication token compatible and I type coerce it into a VideoElement so I can use the smoothing and deblocking features on the video.
At this point, everything works when playing back except for auto bitrate switching.
Can anyone make any suggestions?
Thanks

Answer 1

There are a few points of failure with bitrate switching, some in code, some at the CDN level.
A few things you can do to test / debug would be to try and test each item individually first to be sure that the items are on the server.
for instance you might try:
DynamicStreamingResource()
Vector[0] = new DynamicStreamingItem(“rtmp://video4.mp4”, 400)
If that works, try placing a debug point after your MediaElement is returned from the MediaFactory and the token have been created to ensure it has the - MediaTraitType.DYNAMIC_STREAM
Another option would be to put a listener on the MediaElement to listen for when these traits are added and then ensure that all the elements are there:
I've used similar code to below but just wrote this without context so it may need some modification:
First add a listener:
element.addEventListener(MediaElementEvent.TRAIT_ADD, traitAdded);
A better view of this code:http://pastebin.com/U6104iVR
Then listen :-D:
function traitAdded(event:MediaElementEvent):void {
var element:VideoElement;//should be your video element
          if (event.traitType === withTrait){
                    var dynamicStreamTrait:DynamicStreamTrait = element.getTrait(event.traitType) as DynamicStreamTrait;
  //Make sure autoSwich is true
                    dynamicStreamTrait.autoSwitch = true;
                    dynamicStreamTrait.switchTo(1);
  trace("-----")
                    trace(dynamicStreamTrait.getBitrateForIndex(0));
                    trace(dynamicStreamTrait.getBitrateForIndex(1));
                    trace(dynamicStreamTrait.getBitrateForIndex(2));
  trace("-----")
                    dynamicStreamTrait.addEventListener(DynamicStreamEvent.SWITCHING_CHANGE, function(evt:DynamicStreamEvent):void {
                              if (evt.switching){
  trace("Dynamic stream switching in progress");
                              } else {
                                        trace("Dynamic stream switched to", dynamicStreamTrait.getBitrateForIndex(dynamicStreamTrait.currentIndex));