ISSUE-5

spatial cropping

Handling spatial cropping requires information at client-side

State:
OPEN
Product:
Raised by:
Jack Jansen
Opened on:
2009-04-07
Description:
For temporal clipping, we have said that it is possible to do it either server-side or client-side. The client can detect the fact that it has been done server side (either fully or even partially) by inspecting the HTTP reply headers, and do additional cropping if needed.

For spatial cropping we need similar information too: if the client is to know whether it has to do additional cropping it needs to know not only the width and height of the image it received from the server (which it can probably deduce by inspecting the returned media item) but also the original width and height and, in case the server has already done some cropping, the x and y (in original-media space) of the topleft corner of the returned image.

Special care needs to be taken that the information returned is complete enough that percent-based cropping can be done client-side.
Related Actions Items:
No related actions
Related emails:
  1. Media Fragments Working Group: Agenda 18 November, Telecon 1000 UTC (from Raphael.Troncy@cwi.nl on 2009-11-18)
  2. Re: Media Fragments Working Group: Agenda 07 October, Telecon 0900 UTC (from michael.hausenblas@deri.org on 2009-10-07)
  3. Re: Media Fragments Working Group: Agenda 07 October, Telecon 0900 UTC (from silviapfeiffer1@gmail.com on 2009-10-07)
  4. Media Fragments Working Group: Agenda 07 October, Telecon 0900 UTC (from Raphael.Troncy@cwi.nl on 2009-10-06)
  5. Re: Media Fragments Working Group: Agenda 30 September, Telecon 0900 UTC *NEW HOUR* (from silviapfeiffer1@gmail.com on 2009-09-30)
  6. Media Fragments Working Group: Agenda 30 September, Telecon 0900 UTC *NEW HOUR* (from Raphael.Troncy@cwi.nl on 2009-09-28)
  7. Media Fragments Working Group: Agenda 23 September, Telecon 0900 UTC *NEW HOUR* (from Raphael.Troncy@cwi.nl on 2009-09-23)
  8. Re: Media Fragments Working Group: Agenda 9 September, Telecon 1200 UTC (from conrad@metadecks.org on 2009-09-09)
  9. RE: Media Fragments Working Group: Agenda 9 September, Telecon 1200 UTC (from davy.vandeursen@ugent.be on 2009-09-08)
  10. Media Fragments Working Group: Agenda 9 September, Telecon 1200 UTC (from Raphael.Troncy@cwi.nl on 2009-09-08)
  11. RE: ISSUE-11 (Duration-header): How the UA knows the full media duration when only a fragment is served? (from ylafon@w3.org on 2009-09-02)
  12. RE: Media Fragments Working Group: Agenda 2 September, Telecon 1200 UTC (from davy.vandeursen@ugent.be on 2009-09-02)
  13. Re: Media Fragments Working Group: Agenda 2 September, Telecon 1200 UTC (from michael.hausenblas@deri.org on 2009-09-01)
  14. Media Fragments Working Group: Agenda 2 September, Telecon 1200 UTC (from Raphael.Troncy@cwi.nl on 2009-09-01)
  15. Re: Media Fragments Working Group: Agenda 26 August, Telecon 1200 UTC (from tmichel@w3.org on 2009-08-25)
  16. Re: Media Fragments Working Group: Agenda 26 August, Telecon 1200 UTC (from conrad@metadecks.org on 2009-08-25)
  17. Media Fragments Working Group: Agenda 26 August, Telecon 1200 UTC (from Raphael.Troncy@cwi.nl on 2009-08-24)
  18. RE: Media Fragments Working Group: Agenda 19 August, Telecon 1200 UTC (from davy.vandeursen@ugent.be on 2009-08-19)
  19. Re: Media Fragments Working Group: Agenda 19 August, Telecon 1200 UTC (from michael.hausenblas@deri.org on 2009-08-18)
  20. Media Fragments Working Group: Agenda 19 August, Telecon 1200 UTC (from Raphael.Troncy@cwi.nl on 2009-08-18)
  21. Regrets: Media Fragments Working Group: Agenda 12 August, Telecon 1200 UTC (from golivrin@meraka.org.za on 2009-08-12)
  22. Media Fragments Working Group: Agenda 12 August, Telecon 1200 UTC (from erik.mannens@ugent.be on 2009-08-11)
  23. RE: Media Fragments Working Group: Agenda 5 August, Telecon 1200 UTC (from davy.vandeursen@ugent.be on 2009-08-04)
  24. Media Fragments Working Group: Agenda 5 August, Telecon 1200 UTC (from erik.mannens@ugent.be on 2009-08-04)
  25. Re: Media Fragments Working Group: Agenda 29 July, Telecon 1200 UTC (from michael.hausenblas@deri.org on 2009-07-29)
  26. Re: Media Fragments Working Group: Agenda 29 July, Telecon 1200 UTC (from silviapfeiffer1@gmail.com on 2009-07-29)
  27. Re: Media Fragments Working Group: Agenda 29 July, Telecon 1200 UTC (from michael.hausenblas@deri.org on 2009-07-28)
  28. RE: Media Fragments Working Group: Agenda 29 July, Telecon 1200 UTC (from davy.vandeursen@ugent.be on 2009-07-28)
  29. Media Fragments Working Group: Agenda 29 July, Telecon 1200 UTC (from erik.mannens@ugent.be on 2009-07-28)
  30. Re: Media Fragments Working Group: Agenda 22 July, Telecon 1200 UTC (from michael.hausenblas@deri.org on 2009-07-22)
  31. Media Fragments Working Group: Agenda 22 July, Telecon 1200 UTC (from erik.mannens@ugent.be on 2009-07-22)
  32. Re: Media Fragments Working Group: Agenda 15 July, Telecon 1200 UTC (from conrad@metadecks.org on 2009-07-15)
  33. Re: Media Fragments Working Group: Agenda 15 July, Telecon 1200 UTC (from silviapfeiffer1@gmail.com on 2009-07-15)
  34. Media Fragments Working Group: Agenda 15 July, Telecon 1200 UTC (from erik.mannens@ugent.be on 2009-07-15)
  35. Re: Media Fragments Working Group: Agenda 24 June, Telecon 1200 UTC (from tmichel@w3.org on 2009-06-24)
  36. Media Fragments Working Group: Agenda 24 June, Telecon 1200 UTC (from Raphael.Troncy@cwi.nl on 2009-06-24)
  37. Re: Media Fragments Working Group: Agenda 17 June, Telecon 1200 UTC (from michael.hausenblas@deri.org on 2009-06-17)
  38. Media Fragments Working Group: Agenda 17 June, Telecon 1200 UTC (from erik.mannens@ugent.be on 2009-06-17)
  39. Re: Media Fragments Working Group: Agenda 10 June, Telecon 1200 UTC (from michael.hausenblas@deri.org on 2009-06-10)
  40. RE: Media Fragments Working Group: Agenda 10 June, Telecon 1200 UTC (from davy.vandeursen@ugent.be on 2009-06-10)
  41. Re: Media Fragments Working Group: Agenda 10 June, Telecon 1200 UTC (from ylafon@w3.org on 2009-06-09)
  42. Media Fragments Working Group: Agenda 10 June, Telecon 1200 UTC (from Raphael.Troncy@cwi.nl on 2009-06-09)
  43. RE: Media Fragments Working Group: Agenda 20 May, Telecon 1200 UTC (from erik.mannens@ugent.be on 2009-05-19)
  44. Media Fragments Working Group: Agenda 20 May, Telecon 1200 UTC (from Raphael.Troncy@cwi.nl on 2009-05-19)
  45. RE: Media Fragments Working Group: Agenda 13 May, Telecon 1200 UTC (from erik.mannens@ugent.be on 2009-05-13)
  46. Re: Media Fragments Working Group: Agenda 13 May, Telecon 1200 UTC (from michael.hausenblas@deri.org on 2009-05-13)
  47. RE: Media Fragments Working Group: Agenda 13 May, Telecon 1200 UTC (from davy.vandeursen@ugent.be on 2009-05-13)
  48. Media Fragments Working Group: Agenda 13 May, Telecon 1200 UTC (from Raphael.Troncy@cwi.nl on 2009-05-12)
  49. Re: Media Fragments Working Group: Agenda 29 April, Telecon 1200 UTC (from conrad@metadecks.org on 2009-04-29)
  50. RE: Media Fragments Working Group: Agenda 29 April, Telecon 1200 UTC (from davy.vandeursen@ugent.be on 2009-04-29)
  51. Media Fragments Working Group: Agenda 29 April, Telecon 1200 UTC (from Raphael.Troncy@cwi.nl on 2009-04-29)
  52. Re: Discovery and fallback for media segment addressing over HTTP (from conrad@metadecks.org on 2009-04-08)
  53. Re: Discovery and fallback for media segment addressing over HTTP (from Raphael.Troncy@cwi.nl on 2009-04-07)
  54. ISSUE-5: Handling spatial cropping requires information at client-side (from sysbot+tracker@w3.org on 2009-04-07)

Related notes:

2009-04-17 14:55:30: There may be an loose analogy in the temporal domain: we currently specify that clipped begin- and end-time are transmitted from server to client, but by passing more information here (begin- and end-time per track?) we may be able to let the UA re-sync tracks that got out of sync because of non-transcoding or something. [Jack Jansen]

Display change log ATOM feed

Raphaël Troncy <Raphael.Troncy@cwi.nl>, Erik Mannens <erik.mannens@ibbt.be>, Chairs, Yves Lafon <ylafon@w3.org>, Thierry Michel <tmichel@w3.org>, Staff Contacts
Tracker, originally developed by Dean Jackson, is developed and maintained by the Systems Team <w3t-sys@w3.org>.
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