libavformat/mpegtsenc.c:589: error: Uninitialized Value
  The value read from buf[_] was never initialized.

libavformat/mpegtsenc.c:589:17: 
587.         if (stuffing_len > 0) {
588.             /* add stuffing with AFC */
589.             if (buf[3] & 0x20) {
                     ^
590.                 /* stuffing already present: increase its size */
591.                 afc_len = buf[4] + 1;
