[FFmpeg-trac] #4261(undetermined:new): Systematic artefacts from 10bit Source

FFmpeg trac at avcodec.org
Fri Apr 17 16:38:37 CEST 2015


#4261: Systematic artefacts from 10bit Source
-------------------------------------+-------------------------------------
             Reporter:  solidghost   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by solidghost):

 Im sorry but my ffmpeg build cant use those "sdl" & "xv".

 But I have testet your code below.
 {{{
 ffmpeg -i out.m2v -vf crop=100:100:0:0,scale=1000:1000 -qscale 2 -vframes
 1 out.jpg
 }}}
 1: if you use the m2v-file that was coded from the 10 bit source using
 "-dc 11" it will absolutely have artefacts.
 2: if you use the same command but uses the 10 bit source instead of the
 m2v file, that jpg will look clean.

 Just compare those 2 jpg pictures. Its hard to see but the one from the
 m2v-file, if you look very closely will look almost little green every
 second column of pixels. And if you take both of these pictures to any
 program that can measure pixel colour values you will see when dragging
 your mouse over them that the one from the m2v-file will have color
 changes. Small but still they are not constant as the other .jpg created
 from the 10bit source mov.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4261#comment:17>
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