libavformat/id3v2.c:227: error: Uninitialized Value
  The value read from tflags was never initialized.

libavformat/id3v2.c:227:13: 
225.         next = url_ftell(s->pb) + tlen;
226. 
227.         if (tflags & ID3v2_FLAG_DATALEN) {
                 ^
228.             get_be32(s->pb);
229.             tlen -= 4;
