libavcodec/ffv1.c:783: error: Buffer Overrun L1
  Offset: [3, 4] Size: 2.

libavcodec/ffv1.c:770:32: <Length trace>
768. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){
769.     int x, y;
770.     int_fast16_t sample_buffer[2][w+6];
                                    ^
771.     int_fast16_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};
772. 

libavcodec/ffv1.c:770:32: Array declaration
768. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){
769.     int x, y;
770.     int_fast16_t sample_buffer[2][w+6];
                                    ^
771.     int_fast16_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};
772. 

libavcodec/ffv1.c:771:30: Assignment
769.     int x, y;
770.     int_fast16_t sample_buffer[2][w+6];
771.     int_fast16_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};
                                  ^
772. 
773.     s->run_index=0;

libavcodec/ffv1.c:783:24: Array access: Offset: [3, 4] Size: 2
781.         sample[1]= temp;
782. 
783.         sample[1][-1]= sample[0][0  ];
                            ^
784.         sample[0][ w]= sample[0][w-1];
785. 
