[FFmpeg-trac] #4151(swscale:new): Crash the ffmpeg then convert YV12 (yuv420p) to NV12 if width is less than 32

[FFmpeg]

#4151: Crash the ffmpeg then convert YV12 (yuv420p) to NV12 if width is less than
32
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             Reporter:  v0lt     |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  swscale  |                  Version:  git-master
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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 Summary of the bug:
 I have same samples with  lagarith YV12 (yuv420p). When the width is less
 than 32 fmppeg crash when converting to NV12.

 How to reproduce:
 {{{
 % ffmpeg -i bw16x16_yv12.avi -vcodec rawvideo -pix_fmt nv12
 bw16x16_nv12.avi
 ffmpeg version N-68141-g4280150
 built on Dec  1 2014 22:02:05 with gcc 4.9.2 (GCC)
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4151>
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