[FFmpeg-trac] #4000(undetermined:new): mpeg4: Magenta color shift in first GOP

[FFmpeg]

#4000: mpeg4: Magenta color shift in first GOP
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             Reporter:               |                    Owner:
  ErikCJohansson                     |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by ErikCJohansson):

 > How can I see in the histogram plots that frame 1 has a higher magenta
 colour shift than frame 0?

 The histogram each consists of three curves, one for each of R, G and B.
 They are color coded as you would expect. In the histogram of the source
 frame and frame 0, the peak around 900 has three separate peaks - one for
 each of the plotted colors. In the histogram for frame 1 the blue and red
 curves have been shifted to the right.

 > How did you produce this histogram? Did you use libswscale (FFmpeg) for
 the colour space conversion?
 I used Baselight (www.filmlight.ltd.uk), libswscale not involved.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4000#comment:5>
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