[Theora-dev] erroneous implementation?

Ivan Popov pin at medic.chalmers.se
Tue Aug 31 06:07:37 PDT 2004


I am curious, what is the cause of some encoding artifacts,
I guess part of them should not be present.

- when encoding with a defined bitrate, some artifacts show up which I'd not
  suppose to be there at all. I attach a screenshot from the beginning og
  Harry Potter 1 at the moment before the "Privet Drive" plate slowly appears
  from the darkness. Note the green and red rectangles.
  It is encoded with -V 600 with encoder_example
  and the effect is there with ot without mmx-optimizations and at other
  bitrates too, though as a bit different pattern, in the same part of the
  screen. I can not see any pattern there in the original.

  (I gamma-corrected (x2) the screenshot to make the effect more visible)

Any comments?

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