lavf: More informative error message

Print the timestamp values and not just the stream index.

libavformat/mux.c

@@ -294,7 +294,10 @@ static int compute_pkt_fields2(AVFormatContext *s, AVStream *st, AVPacket *pkt)
         return AVERROR(EINVAL);
     }
     if (pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts) {
-        av_log(s, AV_LOG_ERROR, "pts < dts in stream %d\n", st->index);
+        av_log(s, AV_LOG_ERROR,
+               "pts %" PRId64 " < dts %" PRId64 " in stream %d\n",
+               pkt->pts, pkt->dts,
+               st->index);
         return AVERROR(EINVAL);
     }