libavcodec/h264.c:3328: error: Uninitialized Value
  The value read from frame_num was never initialized.

libavcodec/h264.c:3328:13: 
3326.             if(s->avctx->debug&FF_DEBUG_MMCO)
3327.                 av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n", h->mmco[i].short_pic_num, h->short_ref_count);
3328.             remove_short(h, frame_num, structure ^ PICT_FRAME);
                  ^
3329.             break;
3330.         case MMCO_SHORT2LONG:
