libavfilter/vf_pad.c:265: error: Uninitialized Value
  The value read from bar_y was never initialized.

libavfilter/vf_pad.c:265:9: 
263. 
264.     if (bar_h) {
265.         ff_draw_rectangle(link->dst->outputs[0]->out_buf->data,
             ^
266.                           link->dst->outputs[0]->out_buf->linesize,
267.                           pad->line, pad->line_step, pad->hsub, pad->vsub,
