libavfilter/vsrc_buffer.c:132: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned32 by call to `avfilter_unref_buffer`.

libavfilter/vsrc_buffer.c:128:5: Assignment
126.     picref->pixel_aspect    = c->pixel_aspect;
127.     picref->interlaced      = c->frame.interlaced_frame;
128.     picref->top_field_first = c->frame.top_field_first;
         ^
129.     avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
130.     avfilter_draw_slice(link, 0, link->h, 1);

libavfilter/vsrc_buffer.c:130:5: Call
128.     picref->top_field_first = c->frame.top_field_first;
129.     avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
130.     avfilter_draw_slice(link, 0, link->h, 1);
         ^
131.     avfilter_end_frame(link);
132.     avfilter_unref_buffer(picref);

libavfilter/avfilter.c:293:1: Parameter `link->cur_pic->linesize[*]`
  291. }
  292. 
  293. void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
       ^
  294. {
  295.     uint8_t *src[4], *dst[4];

libavfilter/vsrc_buffer.c:132:5: Call
130.     avfilter_draw_slice(link, 0, link->h, 1);
131.     avfilter_end_frame(link);
132.     avfilter_unref_buffer(picref);
         ^
133. 
134.     c->has_frame = 0;

libavfilter/avfilter.c:57:1: <LHS trace>
55. }
56. 
57. void avfilter_unref_buffer(AVFilterBufferRef *ref)
    ^
58. {
59.     if(!(--ref->buf->refcount))

libavfilter/avfilter.c:57:1: Parameter `ref->buf->refcount`
  55. }
  56. 
  57. void avfilter_unref_buffer(AVFilterBufferRef *ref)
      ^
  58. {
  59.     if(!(--ref->buf->refcount))

libavfilter/avfilter.c:59:10: Binary operation: ([0, +oo] - 1):unsigned32 by call to `avfilter_unref_buffer` 
  57. void avfilter_unref_buffer(AVFilterBufferRef *ref)
  58. {
  59.     if(!(--ref->buf->refcount))
               ^
  60.         ref->buf->free(ref->buf);
  61.     av_free(ref);
