[FFmpeg-trac] #3785(swscale:new): SWSCALE: in_range, in_color_matrix, out_range, out_color_matrix incorrect
FFmpeg
trac at avcodec.org
Sun Jul 20 02:04:38 CEST 2014
#3785: SWSCALE: in_range, in_color_matrix, out_range, out_color_matrix incorrect
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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 |
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Comment (by troy_s):
Just performed a git pull and tested the raw YCbCr output again. Looks
better, but still not quite there given that there are channels that use
the whole range of values.
Working on a better test case, but until then, here's the result which
again shows error in the Cb plane from what I can see:
{{{
Channel statistics:
Red:
min: 0 (0)
max: 255 (1)
mean: 103.415 (0.40555)
standard deviation: 84.4958 (0.331356)
kurtosis: -1.32109
skewness: 0.447833
Green:
min: 18 (0.0705882)
max: 255 (1)
mean: 130.343 (0.51115)
standard deviation: 43.1051 (0.169039)
kurtosis: 0.529155
skewness: 0.18529
Blue:
min: 0 (0)
max: 255 (1)
mean: 0.940625 (0.00368873)
standard deviation: 13.2052 (0.051785)
kurtosis: 269.06
skewness: 15.9677
}}}
Cb showing 18 is close to broadcast range, but still off. No idea what
might be causing it, but it suggests more than pure broadcast scaling.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/3785#comment:9>
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