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int main(){  const char *filename = "toto.flv";  AVInputFormat *fmt;  AVFormatContext *oc;  ByteIOContext pb;  av_register_all();  //   fmt = guess_format(NULL, filename, NULL);  //  oc->oformat = fmt;  snprintf(oc->filename, sizeof(oc->filename), "%s", filename);  av_open_input_file(&oc, filename , fmt, 0, NULL);  printf("Duration: %d\n",oc->duration);  return 0;}