lavf/hlsenc: append last incomplete segment when closing the output

Also introduce missing check on PTS value in case of NOPTS value.

libavformat/hlsenc.c

@@ -49,6 +49,7 @@ typedef struct HLSContext {
     int has_video;
     int64_t start_pts;
     int64_t end_pts;
+    int64_t duration;      ///< last segment duration computed so far, in seconds
     int nb_entries;
     ListEntry *list;
     ListEntry *end_list;
@@ -252,7 +253,7 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
     AVFormatContext *oc = hls->avf;
     AVStream *st = s->streams[pkt->stream_index];
     int64_t end_pts = hls->recording_time * hls->number;
-    int ret;
+    int ret, is_ref_pkt = 0;
 
     if (hls->start_pts == AV_NOPTS_VALUE) {
         hls->start_pts = pkt->pts;
@@ -260,17 +261,23 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
     }
 
     if ((hls->has_video && st->codec->codec_type == AVMEDIA_TYPE_VIDEO)      &&
+        pkt->pts != AV_NOPTS_VALUE) {
+        is_ref_pkt = 1;
+        hls->duration = av_rescale(pkt->pts - hls->end_pts,
+                                   st->time_base.num, st->time_base.den);
+    }
+
+    if (is_ref_pkt &&
         av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
                       end_pts, AV_TIME_BASE_Q) >= 0 &&
         pkt->flags & AV_PKT_FLAG_KEY) {
 
-        ret = append_entry(hls, av_rescale(pkt->pts - hls->end_pts,
-                                           st->time_base.num,
-                                           st->time_base.den));
+        ret = append_entry(hls, hls->duration);
         if (ret)
             return ret;
 
         hls->end_pts = pkt->pts;
+        hls->duration = 0;
 
         av_write_frame(oc, NULL); /* Flush any buffered data */
         avio_close(oc->pb);
@@ -300,6 +307,7 @@ static int hls_write_trailer(struct AVFormatContext *s)
     avio_closep(&oc->pb);
     avformat_free_context(oc);
     av_free(hls->basename);
+    append_entry(hls, hls->duration);
     hls_window(s, 1);
 
     free_entries(hls);