libavcodec/extract_extradata_bsf.c:127: error: Uninitialized Value
  The value read from filtered_data was never initialized.

libavcodec/extract_extradata_bsf.c:127:13: 
125.             pkt->buf  = filtered_buf;
126.             pkt->data = filtered_buf->data;
127.             pkt->size = filtered_data - filtered_buf->data;
                 ^
128.         }
129.     }
