libavfilter/vf_pad.c:370: error: Uninitialized Value
  The value read from bar_y was never initialized.

libavfilter/vf_pad.c:370:9: 
368.                           pad->line, pad->line_step, pad->hsub, pad->vsub,
369.                           0, bar_y, pad->w, bar_h);
370.         ff_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
             ^
371.     }
372. }
