- From: <bugzilla@jessica.w3.org>
- Date: Tue, 30 Aug 2011 00:41:30 +0000
- To: public-html-a11y@w3.org
http://www.w3.org/Bugs/Public/show_bug.cgi?id=13357 --- Comment #6 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> 2011-08-30 00:41:27 UTC --- Bob, you are referring to the "pass-through" rule and references to the use of secondary audio programming in the FCC ruling. What this refers to is the use of multichannel video programming distributors (MVPDs), which provide a second and separate audio channel to the main one in which additional audio content can be distributed. Most of the concerns raised in the FCC document are about the current use of the secondary channel for a second language audio track and that a requirement to provide audio descriptions would require stopping that service which is not acceptable for a different part of the MVPDs audience. All of the discussion in the FCC document are about MVPDs, i.e. about distributing audio descriptions in a secondary audio track. Nowhere do I see a discussion about a mixed audio tracks. The only mixing that happens is in the receiving device for display purposes. So, I don't really follow your argument that this is a reason for introducing a new @kind value. In contrast, the ATSC Digital Television specification indeed allows an associated visually impaired service to the main service to be either a single channel (which is what is typically implemented) or a complete mix of all program elements (i.e. main and audio description). See http://www.atsc.org/cms/standards/a_54a_with_corr_1.pdf (6.6.2.3, 6.6.4.3) and http://www.atsc.org/cms/index.php/standards/document-download/doc_download/13-a52b-digital-audio-compression-standard-ac-3-e-ac-3-revision-b (p. 117, full_svc flag) However, it seems that most implementations only do a single channel. Do you know if there are actual implementations out there that do such a mixed delivery? And do they actually mix the channels or do they dedicate, for example, the center channel to audio descriptions, thus retaining the separation? -- Configure bugmail: http://www.w3.org/Bugs/Public/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
Received on Tuesday, 30 August 2011 00:41:33 UTC