ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource?

Raphael

What is the mime type of a media fragment? What is its relation with its parent resource?

State:
CLOSED
Product:
Raised by:
Raphaël Troncy
Opened on:
2009-01-21
Description:
Related to a discussion started by Guillaume [1].

A media fragment URI can be used for addressing, for example, a particular audio track of a mkv movie, or a particular key-frame of a video. What is the resulting mime type of the secondary resource specified by the fragment (audio, thumbnail, text)? Should we specify it in the recommendation?
What RFC3986 does say about the mime type of a fragment [2]?

Side issue: in case we create a new resource (i.e. using the query '?' parameter instead of the fragment '#' parameter), how do we make explicit the relationship with the parent resource it was extracted from?
Do we use Link: rel="part_of" <video_uri> as suggested by Yves [3]?

[1] http://lists.w3.org/Archives/Public/public-media-fragment/2008Nov/0076.html
[2] http://tools.ietf.org/html/rfc3986#section-3.5
[3] http://lists.w3.org/Archives/Public/public-media-fragment/2008Dec/0011.html
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Related emails:
  1. Re: Media Fragments Working Group: Agenda 81 February, Telecon 1000 UTC (from michael.hausenblas@deri.org on 2009-02-17)
  2. Re: Media Fragments Working Group: Agenda 81 February, Telecon 1000 UTC (from silviapfeiffer1@gmail.com on 2009-02-17)
  3. Re: Media Fragments Working Group: Agenda 81 February, Telecon 1000 UTC (from ylafon@w3.org on 2009-02-17)
  4. Re: Media Fragments Working Group: Agenda 81 February, Telecon 1000 UTC (from silviapfeiffer1@gmail.com on 2009-02-17)
  5. Media Fragments Working Group: Agenda 81 February, Telecon 1000 UTC (from Raphael.Troncy@cwi.nl on 2009-02-16)
  6. Re: Proposed text to close ISSUE-2 (from silviapfeiffer1@gmail.com on 2009-02-13)
  7. Re: Proposed text to close ISSUE-2 (from conrad@metadecks.org on 2009-02-12)
  8. Re: Proposed text to close ISSUE-2 (from Raphael.Troncy@cwi.nl on 2009-02-12)
  9. Re: Proposed text to close ISSUE-2 (from conrad@metadecks.org on 2009-02-12)
  10. Proposed text to close ISSUE-2 (from Raphael.Troncy@cwi.nl on 2009-02-12)
  11. minutes of 2009-02-11 teleconference (from Raphael.Troncy@cwi.nl on 2009-02-12)
  12. Media Fragments Working Group: Agenda 11 February, Telecon 1000 UTC (from Raphael.Troncy@cwi.nl on 2009-02-10)
  13. Re: ISSUE-2 (Raphael): What is the mime type of a media fragment? What is its relation with its parent resource? (from conrad@metadecks.org on 2009-02-05)
  14. minutes of 2009-01-28 teleconference (from Raphael.Troncy@cwi.nl on 2009-01-28)
  15. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-28)
  16. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-28)
  17. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from silviapfeiffer1@gmail.com on 2009-01-28)
  18. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from Raphael.Troncy@cwi.nl on 2009-01-28)
  19. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-28)
  20. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from Raphael.Troncy@cwi.nl on 2009-01-28)
  21. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from Raphael.Troncy@cwi.nl on 2009-01-28)
  22. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from silviapfeiffer1@gmail.com on 2009-01-28)
  23. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from silviapfeiffer1@gmail.com on 2009-01-28)
  24. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from silviapfeiffer1@gmail.com on 2009-01-28)
  25. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from silviapfeiffer1@gmail.com on 2009-01-28)
  26. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-27)
  27. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-27)
  28. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from Jack.Jansen@cwi.nl on 2009-01-27)
  29. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from ylafon@w3.org on 2009-01-27)
  30. Media Fragments Working Group: Agenda 28 January, Telecon 1000 UTC (from Raphael.Troncy@cwi.nl on 2009-01-27)
  31. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from yves.raimond@gmail.com on 2009-01-27)
  32. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-27)
  33. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from yves.raimond@gmail.com on 2009-01-27)
  34. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-27)
  35. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from singer@apple.com on 2009-01-27)
  36. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from yves.raimond@gmail.com on 2009-01-27)
  37. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from Raphael.Troncy@cwi.nl on 2009-01-27)
  38. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from singer@apple.com on 2009-01-27)
  39. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-27)
  40. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-27)
  41. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from Raphael.Troncy@cwi.nl on 2009-01-27)
  42. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from singer@apple.com on 2009-01-27)
  43. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from Raphael.Troncy@cwi.nl on 2009-01-27)
  44. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from singer@apple.com on 2009-01-27)
  45. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-27)
  46. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from Raphael.Troncy@cwi.nl on 2009-01-27)
  47. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from michael.hausenblas@deri.org on 2009-01-27)
  48. Re: ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from silviapfeiffer1@gmail.com on 2009-01-27)
  49. ISSUE-2: What is the mime type of a media fragment? What is its relation with its parent resource? (from Raphael.Troncy@cwi.nl on 2009-01-27)
  50. ISSUE-2 (Raphael): What is the mime type of a media fragment? What is its relation with its parent resource? (from sysbot+tracker@w3.org on 2009-01-21)

Related notes:

[raphael]: http://www.w3.org/2008/WebVideo/Fragments/tracker/issues/2

28 Jan 2009, 10:51:58

The mime type of a media fragment is the *same* mime time of its parent resource. Hence, a media fragment addressing a single frame of a video would be of mime type video. If the media format constrains the playability of such resource (e.g. MP4 or 3GP explicitly forbid to have video with a zero duration), then the selection of this fragment will fail. In other words, media fragment URI are bound to the limitations of the underlying coding and container formats.

Raphaël Troncy, 12 Feb 2009, 13:23:19

Addressing a single frame of a video as an image will create a *new* resource. It is therefore *NOT* a fragment. It might be possible to create such a resource using a '?' followed by the same syntax of the media fragment URI. It might be possible to use the link header provided by http to provide a (typed) link towards the video resource from which the image comes from. The mime type of this new resource would certainly be image/*.
The summary is, returning an image frame from a video is not a fragment of this video.

Raphaël Troncy, 12 Feb 2009, 14:30:39

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Raphaël Troncy <Raphael.Troncy@eurecom.fr>, Erik Mannens <erik.mannens@ugent.be>, Chairs, Yves Lafon <ylafon@w3.org>, Thierry Michel <tmichel@w3.org>, Staff Contacts
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