![]() In the case of a live programme, this may be to improve the synchronisation, or on any programme this may correct errors or mistakes in the subtitles. One of the main reasons we keep the subtitles as a sidecar file is that it’s not unusual for subtitles to change after publication. On all other platforms, we deliver the subtitles as a separate XML file (often called a “sidecar” file), but Apple require it to be more closely coupled with the media (specifically, referenced from the HLS manifest). The big difference between Apple’s approach and the approach the BBC uses on all other platforms is how the subtitles are handled relative to the media. This is much closer to the BBC’s strategic format, EBU-TT-D (the two standards aren’t precisely the same, but it is possible to produce files that conform to both). ![]() However, in recent years Apple have added support for the W3C’s “TTML Profiles for Internet Media Subtitles” format, usually abbreviated to “IMSC”. We are working towards it but > don't currently have timelines associated with this support.Ĭould you please therefore provide a summary of the technical challenges faced in adopting the captioning framework made available in tvOS?īelow is a summary of the challenges associated with delivering subtitles to Apple TV:ĪppleTV for a long time supported only WebVTT subtitles, and the BBC does not support that format as it has significant limitations and is not compatible with the BBC Subtitle Guidelines. > There are technical challenges associated with delivering subtitles to > Apple TV which will require a significantly different solution to that > which we use on all other platforms. The help centre article "Why are there no subtitles on BBC iPlayer via Apple TV?" states the following: Thank you for your request to the BBC of 21 August 2020 seeking the following information under the Freedom of Information Act 2000 (‘the Act’): An update on this one, someone helpfully sent in an FOI request recently and had this response:īritish Broadcasting Corporation Room BC2 A4 Broadcast Centre White City Wood Lane London W12 7TP Telephone 020 8008 2882 Email Rights bbc.co.uk/foi bbc.co.uk/privacyįreedom of Information Request - RFI20201271
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