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

FFmpeg trac at avcodec.org
Wed Jan 14 17:13:02 CET 2015

#4261: Systematic artefacts from 10bit Source
             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            |

Comment (by solidghost):

 Here you can download a ZIP-File containing som 10_bit files and ProRes.


 1: Use the files above with the command line below.

 ffmpeg -i INPUT.mov -vcodec mpeg2video -aspect {$aspectRatio} -r 25
 -pix_fmt yuv422p -timecode_frame_start 0 -minrate 150000k -maxrate 150000k
 -b 150000k -intra -flags +cgop -flags2 +ivlc+non_linear_q -dc 11
 -sc_threshold 1000000000 -qscale 1 -qmin 1 -qmax 12 -bufsize 47185920
 -rc_init_occupancy 47185920 -rc_buf_aggressivity 0.25 -s {$resolution}
 -vframes {$frameDuration} -an OUTPUT.m2v

 2: Open the .m2v file in a software that you can zoom in. Like Adobe After

 3: At the end of the footage you will see some color bars. Zoom-in to the
 upper left grey column. There and other places you can see the systematic
 artefact pixels. Looks like a checker board.

Ticket URL: <https://trac.ffmpeg.org/ticket/4261#comment:3>
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