libavfilter/vf_pad.c:269: error: Uninitialized Value
  The value read from bar_y was never initialized.

libavfilter/vf_pad.c:269:9: 
267.                           pad->line, pad->line_step, pad->hsub, pad->vsub,
268.                           0, bar_y, pad->w, bar_h);
269.         avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
             ^
270.     }
271. }
