[FFmpeg-trac] #474(avcodec:new): SIG SEV in clear_blocks_sse in ff_h263_decode_mb

FFmpeg trac at avcodec.org
Wed Sep 21 01:58:41 CEST 2011

#474: SIG SEV  in clear_blocks_sse in ff_h263_decode_mb
             Reporter:  sgarcia    |                    Owner:
                 Type:  defect     |                   Status:  new
             Priority:  important  |                Component:  avcodec
              Version:  git        |               Resolution:
             Keywords:             |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |

Comment (by sgarcia):

 More info..

 If I run my program under valgrind I cannot reproduce the crash.

 Also changing the  line



 memset(s->block[0], 0, 2*6*64);

 Also seems to fix the issue.

 I run several h263/flv1 encoders while running the h263 decoder, could
 there be a concurrence problem with the sse assembler function?

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/474#comment:5>
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