vobsub: Only try to merge packets if we have an earlier one stored

Based on patch by 191919 [191919 gmail com].

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@31787 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 2 insertions, 2 deletions

diff --git a/vobsub.c b/vobsub.c
index f208b7d8de..b1c9a06c67 100644
--- a/vobsub.c
+++ b/vobsub.c
@@ -1033,11 +1033,11 @@ void *vobsub_open(const char *const name, const char *const ifo,
                                             last_pts_diff = pkt->pts100 - mpg->pts;
                                         else
                                             pkt->pts100 = mpg->pts;
-                                        if (mpg->merge) {
+                                        if (mpg->merge && queue->current_index > 0) {
                                             packet_t *last = &queue->packets[queue->current_index - 1];
                                             pkt->pts100 = last->pts100;
-                                            mpg->merge = 0;
                                         }
+                                        mpg->merge = 0;
                                         /* FIXME: should not use mpg_sub internal informations, make a copy */
                                         pkt->data = mpg->packet;
                                         pkt->size = mpg->packet_size;