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sprintf(tmp,"%.02x",(char)0xef); would print "ffffffef" instead of "ef", in this case this leads to local array buffer overflow and hard to trace stack corruption. The quick, easy & durty solution is to use (unsigned char) or (uint8_t) Fixes Bugzilla 860 & 845 git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23728 b3059339-0415-0410-9bf9-f77b7e298cf2