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

[FFmpeg]

#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
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 I tested the following:
 {{{
 $ ffmpeg -r 0.1 -i Uncompressed_YUV_10_bit_422.mov -qscale 2 -dc 11 -r 25
 out.m2v
 }}}
 {{{
 $ ffmpeg -i out.m2v -vf crop=100:100:0:0,scale=1000:1000 -qscale 2
 -vframes 1 out.jpg
 }}}
 {{{
 $ ffmpeg -i out.m2v -sws_flags
 lanczos+accurate_rnd+full_chroma_int+full_chroma_inp -vf
 crop=100:100:0:0,scale=1000:1000 -qscale 2 -vframes 1 out2.jpg
 }}}
 And I have difficulties seeing systematic artefacts visible in out.jpg and
 even less in out2.jpg indicating you are reporting a scaler issue in your
 decoding application.
 Additionally, I tested:
 {{{
 $ ffmpeg -i out.m2v -f xv -vf
 crop=100:100:0:0,scale=1000:1000,format=yuyv422 -
 }}}
 And the output looks essentially gray here.

 (I think) I also tested with my hardware scaler:
 {{{
 $ ffmpeg -i out.m2v -f xv -vf crop=100:100:0:0,format=yuyv422 -
 }}}
 Enlarging the small window to my hd1080 screen shows no artefacts here.

 I also tested the following but I don't think ffplay is a good application
 for this test (it doesn't support yuv422 and depends on an external
 library):
 {{{
 $ ffplay out.m2v -vf crop=100:100:0:0,scale=1000:1000
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4261#comment:15>
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