--- ffmpeg-3.3.2.old/libavformat/mux.c
+++ ffmpeg-3.3.2/libavformat/mux.c
@@ -630,7 +630,7 @@
         ((!(s->oformat->flags & AVFMT_TS_NONSTRICT) &&
           st->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE &&
           st->codecpar->codec_type != AVMEDIA_TYPE_DATA &&
-          st->cur_dts >= pkt->dts) || st->cur_dts > pkt->dts)) {
+          st->cur_dts > pkt->dts) || st->cur_dts > pkt->dts)) {
         av_log(s, AV_LOG_ERROR,
                "Application provided invalid, non monotonically increasing dts to muxer in stream %d: %s >= %s\n",
                st->index, av_ts2str(st->cur_dts), av_ts2str(pkt->dts));