[Media_Piping_TF] New bug in relation to 13358 - removing tracks event

Hello,

On recommendation from Ian Hickson I am proposing the following bug to be issues in relationship to 13358 where events for adding tracks are introduced. This bug will address when the tracks are removed. Feel free to comment. I would like to aim to upload it on Thursday after the Media Piping phone conference.

Best Regards,
JanL


Title: <video> change event when tracks are removed

Description:
The Bug 13358 (http://www.w3.org/Bugs/Public/show_bug.cgi?id=13358) provides a means of receiving an event for when tracks are added. In the discussion over how the bug is resolved it was proposed to create a seperate bug for addressing when tracks are removed. Below is a description of the use case.

Support of events for when tracks are adding will create problems for application developers that need to get information when tracks are removed. This is particularly a problem when working with live broadcast (as discussed from webtv IG) or playlists controlled from the video server (single URL is used to initiate the stream). Both cases will have different content or programs being streamed with possibly each content or program having different tracks.

An example for how an application developer may have problem is when a user has language preferences beyond a single language for subtitles or audio. The user preference may be (1) spanish, (2) english, and (3) french. The application may indicate spanish based on available audio/subtitle tracks for a program in a live broadcast but then next scheduled program the spanish audio/subtitle is removed. How does an application keep track of the removed track and change it to english?