[FFmpeg-trac] #2538(undetermined:new): FFMPEG crash in decoding MPEG4 using NEON

[FFmpeg]

#2538: FFMPEG crash in decoding MPEG4 using NEON
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             Reporter:               |                    Owner:
  felixyang_tw                       |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  crash        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by felixyang_tw):

 I found the reason. When I set AVCodecContext:lowres to 3, it always crash
 in MPEG4 decoding, but it's fine in H.264. When I set
 AVCodecContext:lowres to 0, it is OK. I trace the code I find if the
 lowres is not 0 , MPV_motion_lowres will be called. MPV_motion_lowres will
 call ff_put_h264_chroma_mc2_neon and it crashes. I don't know is there any
 limitation in ff_put_h264_chroma_mc2_neon?

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2538#comment:5>
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