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

FFmpeg trac at avcodec.org
Wed Mar 1 02:47:38 EET 2017

#6192: bus error core dump in swscale optimizations on arm
             Reporter:  peterbennett  |                    Owner:
                 Type:  defect        |                   Status:  new
             Priority:  normal        |                Component:  swscale
              Version:  3.2.1         |               Resolution:
             Keywords:  crash         |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |

Comment (by peterbennett):

 Replying to [comment:7 cehoyos]:
 > Why is the line `SET_FF_NVX_TO_ALL_RGBX_FUNC(yuv420p, YUV420P,
 accurate_rnd);` that is mentioned on the MythTV bug tracker not called?
 This is FFMPEG code in FFmpeg/libswscale/arm/swscale_unscaled.c. I do not
 know if or why it is not called when I run ffmpeg executable.
 > (The console output may give an indication why the neon-optimized code
 is not called.)
 I will rerun it and attach the console output here.
 > I suspect the work-around chosen is a very bad idea performance-wise.
 Normally, I agree that it would not be advisable. However in this specific
 case the program is being run once to produce a single image for a
 preview, and it makes little difference if it takes some extra time.

Ticket URL: <https://trac.ffmpeg.org/ticket/6192#comment:8>
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