libavformat/avidec.c:437: error: Buffer Overrun L1
  Offset: -1 Size: 20.

libavformat/avidec.c:232:1: <Offset trace>
230. }
231. 
232. static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
     ^
233. {
234.     AVIContext *avi = s->priv_data;

libavformat/avidec.c:232:1: Parameter `s->nb_streams`
230. }
231. 
232. static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
     ^
233. {
234.     AVIContext *avi = s->priv_data;

libavformat/avidec.c:232:1: <Length trace>
230. }
231. 
232. static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
     ^
233. {
234.     AVIContext *avi = s->priv_data;

libavformat/avidec.c:232:1: Parameter `s->streams[*]`
230. }
231. 
232. static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
     ^
233. {
234.     AVIContext *avi = s->priv_data;

libavformat/avidec.c:437:22: Array access: Offset: -1 Size: 20
435.                 url_fskip(pb, size);
436.             } else {
437.                 st = s->streams[stream_index];
                          ^
438.                 switch(codec_type) {
439.                 case CODEC_TYPE_VIDEO:
