- From: <bugzilla@jessica.w3.org>
- Date: Wed, 22 May 2013 14:14:25 +0000
- To: public-html-media@w3.org
https://www.w3.org/Bugs/Public/show_bug.cgi?id=22137 Bug ID: 22137 Summary: changes in number of audio tracks during advert insertion Classification: Unclassified Product: HTML WG Version: unspecified Hardware: PC OS: Linux Status: NEW Severity: normal Priority: P2 Component: Media Source Extensions Assignee: adrianba@microsoft.com Reporter: oipfjon@gmail.com QA Contact: public-html-bugzilla@w3.org CC: mike@w3.org, public-html-media@w3.org In many cases, the main content will have more than one audio track. This could be multiple languages (depending on the market) as well as accessible audio such as either audio description for the visually impaired or clean audio for the hearing impaired (see section E.4 of TS 101 154 for the latter) or indeed both. In many cases, the audio in adverts may not include any of these tracks and could easily just include one track for audio in the most common language. In cases where more than one audio track is combined in the same byte stream (e.g. MPEG-2 Transport Stream), it is unlikely to be practical or economic to produce versions of each advert supporting each combination of audio tracks matching the content that the advert could be used with. We request the W3C relax the restrictions in section 11 that “apply to all initialization segments in a byte stream” – particularly requirements #1 (“The number and type of tracks must be consistent”) and #3 (“Track IDs must be the same across initialization segments if the segment describes multiple tracks of a single type”) – at least for audio tracks. NOTE: This issue arises from joint discussions between the Open IPTV Forum, HbbTV and the UK DTG. These organizations originally sent a liaison statement to the W3C Web & TV IG which is archived here; https://lists.w3.org/Archives/Member/member-web-and-tv/2013Jan/0000.html (W3C member only link) -- You are receiving this mail because: You are on the CC list for the bug.
Received on Wednesday, 22 May 2013 14:14:27 UTC