[FFmpeg-trac] #1178(avcodec:reopened): tiff enc: visible green dots with odd width and -pix_fmt yuv410p

[FFmpeg]

#1178: tiff enc: visible green dots with odd width and -pix_fmt yuv410p
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             Reporter:  ami_stuff   |                    Owner:
                 Type:  defect      |                   Status:  reopened
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  tif         |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Changes (by khali):

 * cc: jdelvare@… (added)


Comment:

 I am seeing a similar issue. The following command generates a file with
 some green in the bottom right hand side corner, instead of the expected
 white:

 {{{
 % ffmpeg -f lavfi -i "color=color=white:size=20x20" -frames:v 1 -vf
 "format=yuv410p" -f image2 20x20_yuv410p.tiff
 }}}

 Note that 20 isn't odd, it's even a multiple of 4, which should be
 yuv410p-friendly. The bug also shows up for 18x18, 19x19 and 21x21, but
 not 17x17 nor 22x22. It doesn't show up when writing to JPEG instead of
 TIFF. It doesn't show up with format=yuv411p.

 The green spot shows up with eog, evince, gimp and "display". When opening
 the suspect TIFF files with evince, gimp or "display", they complain with:
 "discarding 8 bytes to avoid buffer overrun." I suppose that the discarded
 bytes are creating the corruption.

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Ticket URL: <https://trac.ffmpeg.org/ticket/1178#comment:10>
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