libavfilter/vf_pad.c:285: error: Uninitialized Value
  The value read from bar_y was never initialized.

libavfilter/vf_pad.c:285:9: 
283. 
284.     if (bar_h) {
285.         draw_rectangle(link->dst->outputs[0]->out_buf,
             ^
286.                        pad->line, pad->line_step, pad->hsub, pad->vsub,
287.                        0, bar_y, pad->w, bar_h);
