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

[FFmpeg]

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

 I have Now Attached a ZIP-File containing an '''Uncompressed YUV 10 bit
 422''' file & the resulting Output '''.m2v''' file. Below is the command I
 used.

 You need to Zoom in a lot, specially in the grey areas. Then you will see
 the artefacts. I used After Effects to Zoom.

 The only way to get rid of the Artefacts was to use '''"-dc 8"'''. '''"-dc
 9"''' and higher always gives bad artefacts no matter if you transcode SD
 or HD.



 {{{
 ffmpeg -y -i Uncompressed_YUV_10_bit_422.mov -vcodec mpeg2video -aspect
 16:9 -r 25 -pix_fmt yuv422p -timecode_frame_start 0 -minrate 150000k
 -maxrate 150000k -b:v 150000k -intra -flags +ildct+ilme+cgop -intra_vlc 1
 -non_linear_quant 1 -dc 9 -sc_threshold 1000000000 -q:v 1 -qmin 1 -qmax 12
 -bufsize 47185920 -rc_init_occupancy 47185920 -rc_buf_aggressivity 0.25
 -top 1 -s 720x576 -an OUTPUT.m2v
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4261#comment:5>
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