[FFmpeg-trac] #4983(undetermined:new): Grayscale PNG to grayscale rawvideo gives strange result

[FFmpeg]

#4983: Grayscale PNG to grayscale rawvideo gives strange result
-------------------------------------+-------------------------------------
             Reporter:  kagami       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 I have simple 16x16 grayscale PNG image with checkboard pattern. Pixel
 values go like this: {{{0x00 0xff ..}}}
 I convert it to rawvideo grayscale with: {{{ffmpeg -i in.png -f rawvideo
 -pix_fmt gray out.y}}} and it gives me following result:

 {{{
 $ xxd out.y
 00000000: ff00 ff00 ff00 ff00 ff00 ff00 ff00 ff00  ................
 00000010: 00ff 00ff 00ff 00ff 00ff 00ff 00ff 00ff  ................
 00000020: ff00 ff00 ff00 ff00 ff00 ff00 ff00 ff00  ................
 00000030: 00ff 00ff 00ff 00ff 00ff 00ff 00ff 00ff  ................
 00000040: ff00 ff00 ff00 ff00 ff00 ff00 ff00 ff00  ................
 00000050: 00ff 00ff 00ff 00ff 00ff 00ff 00ff 00ff  ................
 00000060: ff00 ff00 ff00 ff00 ff00 ff00 ff00 ff00  ................
 00000070: 00ff 00ff 00ff 00ff 00ff 00ff 00ff 00ff  ................
 00000080: ff00 ff00 ff00 ff00 ff00 ff00 ff00 ff00  ................
 00000090: 00ff 00ff 00ff 00ff 00ff 00ff 00ff 00ff  ................
 000000a0: ff00 ff00 ff00 ff00 ff00 ff00 ff00 ff00  ................
 000000b0: 00ff 00ff 00ff 00ff 00ff 00ff 00ff 00ff  ................
 000000c0: ff00 ff00 ff00 ff00 ff00 ff00 ff00 ff00  ................
 000000d0: 00ff 00ff 00ff 00ff 00ff 00ff 00ff 00ff  ................
 000000e0: ff00 ff00 ff00 ff00 ff00 ff00 ff00 ff00  ................
 000000f0: 00ff 00ff 00ff 00ff 00ff 00ff 00ff 00ff  ................
 }}}

 For some reason I get {{{0xff 0x00 ..}}} pattern in the output.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4983>
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