lavf/mov.c: Parse upto 2 keyframes after the edit list end in mov_fix_index.

Partially fixes t/6699.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/mov.c

@@ -3298,6 +3298,7 @@ static void mov_fix_index(MOVContext *mov, AVStream *st)
     int packet_skip_samples = 0;
     MOVIndexRange *current_index_range;
     int i;
+    int found_keyframe_after_edit = 0;
 
     if (!msc->elst_data || msc->elst_count <= 0 || nb_old <= 0) {
         return;
@@ -3393,6 +3394,7 @@ static void mov_fix_index(MOVContext *mov, AVStream *st)
 
         // Iterate over index and arrange it according to edit list
         edit_list_start_encountered = 0;
+        found_keyframe_after_edit = 0;
         for (; current < e_old_end; current++, index++) {
             // check  if frame outside edit list mark it for discard
             frame_duration = (current + 1 <  e_old_end) ?
@@ -3505,18 +3507,26 @@ static void mov_fix_index(MOVContext *mov, AVStream *st)
             }
 
             // Break when found first key frame after edit entry completion
-            if (((curr_cts + frame_duration) >= (edit_list_duration + edit_list_media_time)) &&
+            if ((curr_cts + frame_duration >= (edit_list_duration + edit_list_media_time)) &&
                 ((flags & AVINDEX_KEYFRAME) || ((st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)))) {
-
-                if (ctts_data_old && ctts_sample_old != 0) {
-                    if (add_ctts_entry(&msc->ctts_data, &msc->ctts_count,
-                                       &msc->ctts_allocated_size,
-                                       ctts_sample_old - edit_list_start_ctts_sample,
-                                       ctts_data_old[ctts_index_old].duration) == -1) {
-                        av_log(mov->fc, AV_LOG_ERROR, "Cannot add CTTS entry %"PRId64" - {%"PRId64", %d}\n",
-                               ctts_index_old, ctts_sample_old - edit_list_start_ctts_sample,
-                               ctts_data_old[ctts_index_old].duration);
-                        break;
+                if (ctts_data_old) {
+                    // If we have CTTS and this is the the first keyframe after edit elist,
+                    // wait for one more, because there might be trailing B-frames after this I-frame
+                    // that do belong to the edit.
+                    if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO && found_keyframe_after_edit == 0) {
+                        found_keyframe_after_edit = 1;
+                        continue;
+                    }
+                    if (ctts_sample_old != 0) {
+                        if (add_ctts_entry(&msc->ctts_data, &msc->ctts_count,
+                                           &msc->ctts_allocated_size,
+                                           ctts_sample_old - edit_list_start_ctts_sample,
+                                           ctts_data_old[ctts_index_old].duration) == -1) {
+                            av_log(mov->fc, AV_LOG_ERROR, "Cannot add CTTS entry %"PRId64" - {%"PRId64", %d}\n",
+                                   ctts_index_old, ctts_sample_old - edit_list_start_ctts_sample,
+                                   ctts_data_old[ctts_index_old].duration);
+                            break;
+                        }
                     }
                 }
                 break;

tests/fate/mov.mak

@@ -10,6 +10,7 @@ FATE_MOV = fate-mov-3elist \
            fate-mov-gpmf-remux \
            fate-mov-440hz-10ms \
            fate-mov-ibi-elst-starts-b \
+           fate-mov-elst-ends-betn-b-and-i \
 
 FATE_MOV_FFPROBE = fate-mov-aac-2048-priming \
                    fate-mov-zombie \
@@ -42,6 +43,9 @@ fate-mov-1elist-ends-last-bframe: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/mov-1e
 # Makes sure that we handle timestamps of packets in case of multiple edit lists with one of them ending on a B-frame correctly.
 fate-mov-2elist-elist1-ends-bframe: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/mov-2elist-elist1-ends-bframe.mov
 
+# Makes sure that if edit list ends on a B-frame but before the I-frame, then we output the B-frame but discard the I-frame.
+fate-mov-elst-ends-betn-b-and-i: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/elst_ends_betn_b_and_i.mp4
+
 # Makes sure that we handle edit lists and start padding correctly.
 fate-mov-440hz-10ms: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/440hz-10ms.m4a
 

tests/ref/fate/mov-elst-ends-betn-b-and-i

+#format: frame checksums
+#version: 2
+#hash: MD5
+#tb 0: 1/25
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 320x240
+#sar 0: 1/1
+#stream#, dts,        pts, duration,     size, hash
+0,          0,          0,        1,   115200, e10741e5457e9326d5e992e6c05c3e32
+0,          1,          1,        1,   115200, 7e20f8729b6b53dc11791927bf4a5aec
+0,          2,          2,        1,   115200, 4e5dc2b806e394cd666c968f736fecd0
+0,          3,          3,        1,   115200, 7a3c7473d44c5f60c07655f6fc0c2ac3
+0,          4,          4,        1,   115200, 038254422a603a3270c09cdcd149707b
+0,          5,          5,        1,   115200, 7553b6b4547cb23ef8f0392ed5a5d4b0
+0,          6,          6,        1,   115200, 6d017ede7f446124af7308667cb0dc41
+0,          7,          7,        1,   115200, 77752f0288ae64f857732b8e62e47457
+0,          8,          8,        1,   115200, d656833951af99330625f7c6de7685c4
+0,          9,          9,        1,   115200, 14338b833e431e566ac98da841600bfe
+0,         10,         10,        1,   115200, 07ea95d1659f3c4424a470a546d0df6e
+0,         11,         11,        1,   115200, fd05b8cc83072f813e89d394d1f6efc6
+0,         12,         12,        1,   115200, 750b82ca5c7e901545e7b1aa69692426
+0,         13,         13,        1,   115200, 7347679ab09bc936047368b8caebcaff
+0,         14,         14,        1,   115200, 63a23fdd57ac8462b9ffbcb12ab717b3
+0,         15,         15,        1,   115200, 705257a1c99693db233e2a3ee027adcf
+0,         16,         16,        1,   115200, df861a2ec7a4ef70e82b1c28025e5a48
+0,         17,         17,        1,   115200, 2a8b403c077b6b43aa71eaf7d1537713
+0,         18,         18,        1,   115200, 973b5cd3ce473e3970dfa96045553172
+0,         19,         19,        1,   115200, fc612c0afeae3b6576b5ee2f3f119832
+0,         20,         20,        1,   115200, 97074fe5a0b6e7e8470729654092e56c
+0,         21,         21,        1,   115200, 8cf9337201065335b3aa4da21dc9b37a
+0,         22,         22,        1,   115200, 93ff3589294cc0673af3daee1e7fe42a
+0,         23,         23,        1,   115200, c0b6fd870a022f374f9d6c697e8e293d