Chrome API: Media update listener is not invoked as expected.

[GoogleCodeExporter]

Documentation for the Chrome API states that changes to the following 
properties will trigger a listener registered against Media.addUpdateListener:

 - currentTime
 - volume
 - metadata
 - playbackRate
 - playerState 
 - customData

Additionally, the docs state that: 

"Instead of calling [getStatus], apps should prefer relying on the automatic 
invocation of media update listeners."

However, listeners on addUpdateListener() get called sporadically at best, and 
in some cases not at all. In many cases it seems that in order for the SDK to 
even be aware of a state change, you *must* call getStatus() -  essentially 
manually invoking the status listener - and prod the SDK into realising 
something has changed. 

This does not make for a great development experience.

A simple reproduction of this is to register a listener against a Media object 
containing an audio track, and play that track. Playing a track will change the 
currentTime. Changes to currentTime are documented as invoking the listener. 
The listener is not invoked.

Although currentTime is listed as deprecated, this illustrates the problem 
perfectly (and at the very least currentTime should not be listed as a 
trigger). 

A more elaborate setup description is available here: 
http://stackoverflow.com/questions/32223498/google-cast-detect-queueitems-that-f
ail-to-load - The setup is different but the problem is the same: the system 
state is not synced until a call to getStatus.

This behaviour is observed running a cast sender app in Chrome on Debian, 
Ubuntu and Windows 8.1. 

The problem occurs both against a styled media receiver and when casting to 
audio-only devices.

The problem has been present for at least the last 3 months and is still 
present in the latest Cast Beta Extension (15.827.0.6).

Original issue reported on code.google.com by hims...@duncanhall.net on 8 Oct 2015 at 10:07

[GoogleCodeExporter]

Can you reproduce the issue when casting to your styled media receiver and 
audio-only device? Please make sure logging is enabled and try to test for 
multiple changes that should trigger a listener, not just currentTime, and 
provide the repro steps here and the logs as a text file.

Original comment by jonathan...@google.com on 8 Oct 2015 at 10:18

• Changed state: NeedInfo

[GoogleCodeExporter]

If you are still seeing the issue, can you reproduce it and provide the 
requested information?

Original comment by jonathan...@google.com on 16 Oct 2015 at 4:43