libavcodec/h264_refs.c:346: error: Uninitialized Value
  The value read from pic_structure was never initialized.

libavcodec/h264_refs.c:346:21: 
344.                 ref_from_h264pic(&sl->ref_list[list][index], ref);
345.                 if (FIELD_PICTURE(h)) {
346.                     pic_as_field(&sl->ref_list[list][index], pic_structure);
                         ^
347.                 }
348.             }
