This Wiki page is edited by participants of the HTML Accessibility Task Force. It does not necessarily represent consensus and it may have incorrect information or information that is not supported by other Task Force participants, WAI, or W3C. It may also have some very useful information.
From HTML accessibility task force Wiki
Recent Media Bugs
Bug 13400 - Audio: Change note on accessibility for the audio element
Bug 13432 - Editorial changes to The Video element [1 of 5]
Bug 13434 - Editorial changes to The Video element [2 of 5]
Bug 13435 - Editorial changes to The Video element [3 of 5]
Bug 13436 - Editorial changes to The Video element [4 of 5]
Bug 13437 - Editorial changes to The Video element [5 of 5]
Bug 13438 - Editorial changes to Track element [1 of 3]
Bug 13439 - Editorial changes to Track element [2 of 3]
Bug 13440 - Editorial changes to Track element [3 of 3]
Outstanding Media bugs:
Bug 12228 - All Media Elements should have the ability to have both short and longer textual descriptions associated to the element.
Bug 12544 - <video> MEDIA CONTROLLER requires track kind for in-band tracks
Bug 12794 - <video> Add a non-normative note on how to provide text alternatives for media elements
Bug 13383 - Feature request: pause media when hidden
Bug 12405 - <video> There's a problem with overlaying a sign-language video and using native controls, because the overlaid video overlaps the native controls
Bug 11391 - Provide examples of actual <track> usage, user agent implications
Bug 11593 - <video> the <track> @kind attribute should include the all of the identified accessibility content types
Bug 13184 - Allow nested chapters by having nested (time range-wise) cues
Bug 12283 - <video> No indication of parsing error
Bug 12662 - <video> Add a section with suggestions for the 'chapters' text track kind, demonstrating how nested time ranges can be used for hierarchical chapters.
http://www.w3.org/Bugs/Public/show_bug.cgi?id=12662 (possible duplication of Bug 13184)
Bug 12964 - <video>: Declarative linking of full-text transcripts to video and audio elements
Bug 12141 - <video> Specifically state that all <track> options be exposed to the end user
Bug 13359 - A way is needed to identify the type of data in a track element
Bug 13357 - Additional AudioTrack.kind categories are needed to identify tracks where audio descriptions are premixed with main dialogue.