[FFmpeg-trac] #4881(swscale:new): API:swscale with slices gives bad output

[FFmpeg]

#4881: API:swscale with slices gives bad output
------------------------------------+--------------------------------------
             Reporter:  rxt         |                     Type:  defect
               Status:  new         |                 Priority:  normal
            Component:  swscale     |                  Version:  git-master
             Keywords:  regression  |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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 Summary of the bug:
 After the fix in #4877 the scaler no longer crashes with slices, but the
 output is totally wrong. Only some lines at the top of the image are
 drawn, the rest of the picture is black.
 Also this time undefining FILTER_NEW in swscale_internal.h fixes it.

 How to reproduce:
 Compile and run the attached code
 {{{
 gcc -g scaling_r.c  -L/usr/local/lib -lswscale -lm -lavutil -o scaling_r
 }}}
 It will create a file named "qqq". Play the resulting file with
 {{{
 ffplay -f rawvideo -pix_fmt rgb24 -video_size 720x540 qqq
 }}}
 To see how the picture should look line just recompile and run the code
 defining NO_SLICES

 Version
 ffmpeg version N-74836-gaff3acc Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.9.2 (Debian 4.9.2-10)
   configuration: --enable-gpl --enable-postproc --enable-libopencore-amrnb
 --enable-libopencore-amrwb --enable-nonfree --enable-version3 --enable-
 libmp3lame --samples=fate-suite/
   libavutil      55.  2.100 / 55.  2.100
   libavcodec     57.  3.100 / 57.  3.100
   libavformat    57.  2.100 / 57.  2.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6.  8.100 /  6.  8.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
   libpostproc    54.  0.100 / 54.  0.100

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Ticket URL: <https://trac.ffmpeg.org/ticket/4881>
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