ffplay: Fallback to dts if pts is unavailable in pkt_in_play_range calculation

Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

ffplay.c

@@ -2881,6 +2881,7 @@ static int read_thread(void *arg)
     int orig_nb_streams;
     SDL_mutex *wait_mutex = SDL_CreateMutex();
     int scan_all_pmts_set = 0;
+    int64_t pkt_ts;
 
     memset(st_index, -1, sizeof(st_index));
     is->last_video_stream = is->video_stream = -1;
@@ -3143,8 +3144,9 @@ static int read_thread(void *arg)
         }
         /* check if packet is in play range specified by user, then queue, otherwise discard */
         stream_start_time = ic->streams[pkt->stream_index]->start_time;
+        pkt_ts = pkt->pts == AV_NOPTS_VALUE ? pkt->dts : pkt->pts;
         pkt_in_play_range = duration == AV_NOPTS_VALUE ||
-                (pkt->pts - (stream_start_time != AV_NOPTS_VALUE ? stream_start_time : 0)) *
+                (pkt_ts - (stream_start_time != AV_NOPTS_VALUE ? stream_start_time : 0)) *
                 av_q2d(ic->streams[pkt->stream_index]->time_base) -
                 (double)(start_time != AV_NOPTS_VALUE ? start_time : 0) / 1000000
                 <= ((double)duration / 1000000);