avformat/hlsenc: correct log text and supply packet details

libavformat/hlsenc.c

@@ -2471,7 +2471,8 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
             if (pkt->duration) {
                 vs->duration += (double)(pkt->duration) * st->time_base.num / st->time_base.den;
             } else {
-                av_log(s, AV_LOG_WARNING, "pkt->duration = 0, maybe the hls segment duration will not precise\n");
+                av_log(s, AV_LOG_WARNING, "Stream %d packet with pts %" PRId64 " has duration 0. The segment duration may not be precise.\n",
+                       pkt->stream_index, pkt->pts);
                 vs->duration = (double)(pkt->pts - vs->end_pts) * st->time_base.num / st->time_base.den;
             }
         }