[FFmpeg-trac] #3785(swscale:new): SWSCALE: in_range, in_color_matrix, out_range, out_color_matrix incorrect

FFmpeg trac at avcodec.org
Thu Jul 24 13:57:19 CEST 2014


#3785: SWSCALE: in_range, in_color_matrix, out_range, out_color_matrix incorrect
------------------------------------+-----------------------------------
             Reporter:  troy_s      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+-----------------------------------

Comment (by AndyF):

 Well I fell at the first hurdle trying to follow this - that being that
 the testchart.tif are just strange.

 They have bars labelled 100% but their RGB values as shown by display
 (image magick) are eg, 16, 16, 235 - I can't see that makes any sense in
 an RGB tiff.

 Other things - your ffplay command converts to 420 then it (maybe sdl)
 will stretch the yuv to full range rgb on display.

 You can't expect to convert rgb to yuv and back without loss - I think
 doing this will be the best way to test Issues that may exist as you
 should still be able to see levels Poynton -

 http://www.poynton.com/PDFs/Merging_RGB_and_422.pdf

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3785#comment:15>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


More information about the FFmpeg-trac mailing list