libavcodec/h264.c:3280: error: Uninitialized Value
  The value read from frame_num was never initialized.

libavcodec/h264.c:3280:9: 
3278. 
3279.     for(i=0; i<mmco_count; i++){
3280.         int structure, av_uninit(frame_num);
              ^
3281.         if(s->avctx->debug&FF_DEBUG_MMCO)
3282.             av_log(h->s.avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode, h->mmco[i].short_pic_num, h->mmco[i].long_arg);
