[FFmpeg-trac] #6192(undetermined:new): bus error core dump in swscale optimizations on arm

FFmpeg trac at avcodec.org
Sat Feb 25 18:34:19 EET 2017

#6192: bus error core dump in swscale optimizations on arm
             Reporter:  peterbennett  |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  undetermined  |                  Version:  3.2.1
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
 This happened in MythTV (www.mythtv.org) in arm architecture only. In this
 instance MythTV uses sws_scale to convert a frame to RGB format without
 changing its size.

 MythTV has a private copy of FFMPEG source (currently 3.2).

 If input format is AV_PIX_FMT_YUV420P and output format is
 AV_PIX_FMT_BGRA, and the input and output sizes are the same, sws_scale
 fails with a bus error. If I use an output width 1 pixel less than input,
 it avoids some optimization and then works correctly.

 Source code (look for #if ARCH_ARM at line 166).

 There is more info in this ticket

Ticket URL: <https://trac.ffmpeg.org/ticket/6192>
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