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Fix segfault with non existing input files.
Originally committed as revision 14369 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -120,6 +120,10 @@ int main(int argc,char* argv[]){
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f[0]= fopen(argv[1], "rb");
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f[1]= fopen(argv[2], "rb");
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if(!f[0] || !f[1]){
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fprintf(stderr, "couldnt open input files\n");
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return -1;
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}
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fseek(f[shift<0], shift < 0 ? -shift : shift, SEEK_SET);
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fseek(f[0],skip_bytes,SEEK_CUR);
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