ffplay: use frame->pkt_pts instead of pkt->pts in audio pts calculation

Fixes ticket #2717.
Signed-off-by: Marton Balint <cus@passwd.hu>

ffplay.c

@@ -2177,8 +2177,8 @@ static int audio_decode_frame(VideoState *is)
                 tb = (AVRational){1, is->frame->sample_rate};
                 if (is->frame->pts != AV_NOPTS_VALUE)
                     is->frame->pts = av_rescale_q(is->frame->pts, dec->time_base, tb);
-                if (is->frame->pts == AV_NOPTS_VALUE && pkt_temp->pts != AV_NOPTS_VALUE)
-                    is->frame->pts = av_rescale_q(pkt_temp->pts, is->audio_st->time_base, tb);
+                else if (is->frame->pkt_pts != AV_NOPTS_VALUE)
+                    is->frame->pts = av_rescale_q(is->frame->pkt_pts, is->audio_st->time_base, tb);
                 if (pkt_temp->pts != AV_NOPTS_VALUE)
                     pkt_temp->pts += (double) is->frame->nb_samples / is->frame->sample_rate / av_q2d(is->audio_st->time_base);