libavformat/utils.c:1806: error: Uninitialized Value
  The value read from start_time[_] was never initialized.

libavformat/utils.c:1806:13: 
1804.         st = ic->streams[pkt->stream_index];
1805.         if (pkt->pts != AV_NOPTS_VALUE &&
1806.             start_time[pkt->stream_index] != AV_NOPTS_VALUE) {
                  ^
1807.             end_time = pkt->pts;
1808.             duration = end_time - start_time[pkt->stream_index];
