lavf/mov.c: Don't correct edit list start to zero, when we can't find a frame...

lavf/mov.c: Don't correct edit list start to zero, when we can't find a frame before edit list start.

After c2a8f0fc this can happen on normal edit lists starting on a B-frame.
Signed-off-by: Sasi Inguva <isasi@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/mov.c

@@ -3380,13 +3380,11 @@ static void mov_fix_index(MOVContext *mov, AVStream *st)
             if (find_prev_closest_index(st, e_old, nb_old, ctts_data_old, ctts_count_old, search_timestamp, AVSEEK_FLAG_ANY,
                                         &index, &ctts_index_old, &ctts_sample_old) < 0) {
                 av_log(mov->fc, AV_LOG_WARNING,
-                       "st: %d edit list %"PRId64" Cannot find an index entry before timestamp: %"PRId64".\n"
-                       "Rounding edit list media time to zero.\n",
+                       "st: %d edit list %"PRId64" Cannot find an index entry before timestamp: %"PRId64".\n",
                        st->index, edit_list_index, search_timestamp);
                 index = 0;
                 ctts_index_old = 0;
                 ctts_sample_old = 0;
-                edit_list_media_time = 0;
             }
         }
         current = e_old + index;

tests/fate/mov.mak

@@ -12,6 +12,7 @@ FATE_MOV = fate-mov-3elist \
            fate-mov-ibi-elst-starts-b \
            fate-mov-elst-ends-betn-b-and-i \
            fate-mov-frag-overlap \
+           fate-mov-bbi-elst-starts-b \
 
 FATE_MOV_FFPROBE = fate-mov-aac-2048-priming \
                    fate-mov-zombie \
@@ -63,6 +64,11 @@ fate-mov-ibi-elst-starts-b: CMD = framemd5 -flags +bitexact -i $(TARGET_SAMPLES)
 # Makes sure that we handle overlapping framgments
 fate-mov-frag-overlap: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/frag_overlap.mp4
 
+# Makes sure that we pick the right frames according to edit list when there is no keyframe with PTS < edit list start.
+# For example, when video starts on a B-frame, and edit list starts on that B-frame too.
+# GOP structure : B B I in presentation order.
+fate-mov-bbi-elst-starts-b: CMD = framemd5 -flags +bitexact -i $(TARGET_SAMPLES)/h264/twofields_packet.mp4
+
 fate-mov-aac-2048-priming: CMD = run ffprobe$(PROGSSUF)$(EXESUF) -show_packets -print_format compact $(TARGET_SAMPLES)/mov/aac-2048-priming.mov
 
 fate-mov-zombie: CMD = run ffprobe$(PROGSSUF)$(EXESUF) -show_streams -show_packets -show_frames -bitexact -print_format compact $(TARGET_SAMPLES)/mov/white_zombie_scrunch-part.mov