Merge branch 'blender-v3.0-release'

13 files changed, 115 insertions, 132 deletions

diff --git a/source/blender/blenkernel/BKE_movieclip.h b/source/blender/blenkernel/BKE_movieclip.h
index 067dc694109..73c7494b8fa 100644
--- a/source/blender/blenkernel/BKE_movieclip.h
+++ b/source/blender/blenkernel/BKE_movieclip.h
@@ -95,6 +95,7 @@ void BKE_movieclip_build_proxy_frame_for_ibuf(struct MovieClip *clip,
                                               int *build_sizes,
                                               int build_count,
                                               bool undistorted);
+bool BKE_movieclip_proxy_enabled(struct MovieClip *clip);
 
 float BKE_movieclip_remap_scene_to_clip_frame(const struct MovieClip *clip, float framenr);
 float BKE_movieclip_remap_clip_to_scene_frame(const struct MovieClip *clip, float framenr);
diff --git a/source/blender/blenkernel/intern/movieclip.c b/source/blender/blenkernel/intern/movieclip.c
index f4db81fffc5..34fb9f71bd9 100644
--- a/source/blender/blenkernel/intern/movieclip.c
+++ b/source/blender/blenkernel/intern/movieclip.c
@@ -1925,6 +1925,11 @@ void BKE_movieclip_build_proxy_frame_for_ibuf(MovieClip *clip,
   }
 }
 
+bool BKE_movieclip_proxy_enabled(MovieClip *clip)
+{
+  return clip->flag & MCLIP_USE_PROXY;
+}
+
 float BKE_movieclip_remap_scene_to_clip_frame(const MovieClip *clip, float framenr)
 {
   return framenr - (float)clip->start_frame + 1.0f;
diff --git a/source/blender/editors/space_sequencer/sequencer_draw.c b/source/blender/editors/space_sequencer/sequencer_draw.c
index 3374ff11726..72e39d369a5 100644
--- a/source/blender/editors/space_sequencer/sequencer_draw.c
+++ b/source/blender/editors/space_sequencer/sequencer_draw.c
@@ -2721,8 +2721,6 @@ void draw_timeline_seq(const bContext *C, ARegion *region)
   }
 
   UI_view2d_view_ortho(v2d);
-  /* Get timeline bound-box, needed for the scroll-bars. */
-  SEQ_timeline_boundbox(scene, SEQ_active_seqbase_get(ed), &v2d->tot);
   draw_seq_backdrop(v2d);
   if ((sseq->flag & SEQ_SHOW_OVERLAY) && (sseq->timeline_overlay.flag & SEQ_TIMELINE_SHOW_GRID)) {
     U.v2d_min_gridsize *= 3;
@@ -2806,5 +2804,8 @@ void draw_timeline_seq_display(const bContext *C, ARegion *region)
   }
 
   ED_time_scrub_draw_current_frame(region, scene, !(sseq->flag & SEQ_DRAWFRAMES));
+
+  const ListBase *seqbase = SEQ_active_seqbase_get(SEQ_editing_get(scene));
+  SEQ_timeline_boundbox(scene, seqbase, &v2d->tot);
   UI_view2d_scrollers_draw(v2d, NULL);
 }
diff --git a/source/blender/editors/space_sequencer/sequencer_edit.c b/source/blender/editors/space_sequencer/sequencer_edit.c
index 8c70f4e3f7a..12a6981baee 100644
--- a/source/blender/editors/space_sequencer/sequencer_edit.c
+++ b/source/blender/editors/space_sequencer/sequencer_edit.c
@@ -818,8 +818,6 @@ static int sequencer_slip_modal(bContext *C, wmOperator *op, const wmEvent *even
 
     case EVT_ESCKEY:
     case RIGHTMOUSE: {
-      Editing *ed = SEQ_editing_get(scene);
-
       for (int i = 0; i < data->num_seq; i++) {
         transseq_restore(data->ts + i, data->seq_array[i]);
       }
@@ -839,8 +837,6 @@ static int sequencer_slip_modal(bContext *C, wmOperator *op, const wmEvent *even
 
       WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
 
-      SEQ_relations_free_imbuf(scene, &ed->seqbase, false);
-
       if (area) {
         ED_area_status_text(area, NULL);
       }
@@ -1116,7 +1112,6 @@ static int sequencer_reload_exec(bContext *C, wmOperator *op)
 
   for (seq = ed->seqbasep->first; seq; seq = seq->next) {
     if (seq->flag & SELECT) {
-      SEQ_relations_update_changed_seq_and_deps(scene, seq, 0, 1);
       SEQ_add_reload_new_file(bmain, scene, seq, !adjust_length);
 
       if (adjust_length) {
@@ -1326,7 +1321,9 @@ static int sequencer_reassign_inputs_exec(bContext *C, wmOperator *op)
   last_seq->seq3 = seq3;
 
   int old_start = last_seq->start;
-  SEQ_relations_update_changed_seq_and_deps(scene, last_seq, 1, 1);
+  SEQ_time_update_recursive(scene, last_seq);
+
+  SEQ_relations_invalidate_cache_preprocessed(scene, last_seq);
   SEQ_offset_animdata(scene, last_seq, (last_seq->start - old_start));
 
   WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
@@ -1384,7 +1381,7 @@ static int sequencer_swap_inputs_exec(bContext *C, wmOperator *op)
   last_seq->seq1 = last_seq->seq2;
   last_seq->seq2 = seq;
 
-  SEQ_relations_update_changed_seq_and_deps(scene, last_seq, 1, 1);
+  SEQ_relations_invalidate_cache_preprocessed(scene, last_seq);
 
   WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
 
@@ -1791,6 +1788,7 @@ static int sequencer_offset_clear_exec(bContext *C, wmOperator *UNUSED(op))
   while (seq) {
     ListBase *seqbase = SEQ_active_seqbase_get(ed);
     SEQ_time_update_sequence(scene, seqbase, seq);
+    SEQ_relations_invalidate_cache_preprocessed(scene, seq);
     seq = seq->next;
   }
 
@@ -2202,10 +2200,12 @@ static void swap_sequence(Scene *scene, Sequence *seqa, Sequence *seqb)
   seq_b_start = (seqb->start - seqb->startdisp) + seqa->startdisp;
   SEQ_transform_translate_sequence(scene, seqb, seq_b_start - seqb->start);
   SEQ_time_update_sequence(scene, seqbase, seqb);
+  SEQ_relations_invalidate_cache_preprocessed(scene, seqb);
 
   seq_a_start = (seqa->start - seqa->startdisp) + seqb->enddisp + gap;
   SEQ_transform_translate_sequence(scene, seqa, seq_a_start - seqa->start);
   SEQ_time_update_sequence(scene, seqbase, seqa);
+  SEQ_relations_invalidate_cache_preprocessed(scene, seqa);
 }
 
 static Sequence *find_next_prev_sequence(Scene *scene, Sequence *test, int lr, int sel)
@@ -2673,7 +2673,6 @@ static const EnumPropertyItem prop_change_effect_input_types[] = {
 static int sequencer_change_effect_input_exec(bContext *C, wmOperator *op)
 {
   Scene *scene = CTX_data_scene(C);
-  Editing *ed = SEQ_editing_get(scene);
   Sequence *seq = SEQ_select_active_get(scene);
 
   Sequence **seq_1, **seq_2;
@@ -2700,10 +2699,7 @@ static int sequencer_change_effect_input_exec(bContext *C, wmOperator *op)
 
   SWAP(Sequence *, *seq_1, *seq_2);
 
-  SEQ_relations_update_changed_seq_and_deps(scene, seq, 0, 1);
-
-  /* Invalidate cache. */
-  SEQ_relations_free_imbuf(scene, &ed->seqbase, false);
+  SEQ_relations_invalidate_cache_preprocessed(scene, seq);
   WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
 
   return OPERATOR_FINISHED;
@@ -2757,7 +2753,6 @@ EnumPropertyItem sequencer_prop_effect_types[] = {
 static int sequencer_change_effect_type_exec(bContext *C, wmOperator *op)
 {
   Scene *scene = CTX_data_scene(C);
-  Editing *ed = SEQ_editing_get(scene);
   Sequence *seq = SEQ_select_active_get(scene);
   const int new_type = RNA_enum_get(op->ptr, "type");
 
@@ -2783,10 +2778,7 @@ static int sequencer_change_effect_type_exec(bContext *C, wmOperator *op)
   sh = SEQ_effect_handle_get(seq);
   sh.init(seq);
 
-  SEQ_relations_update_changed_seq_and_deps(scene, seq, 0, 1);
-  /* Invalidate cache. */
-  SEQ_relations_free_imbuf(scene, &ed->seqbase, false);
-
+  SEQ_relations_invalidate_cache_preprocessed(scene, seq);
   WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
 
   return OPERATOR_FINISHED;
@@ -2880,9 +2872,6 @@ static int sequencer_change_path_exec(bContext *C, wmOperator *op)
 
     ListBase *seqbase = SEQ_active_seqbase_get(SEQ_editing_get(scene));
     SEQ_time_update_sequence(scene, seqbase, seq);
-
-    /* Invalidate cache. */
-    SEQ_relations_free_imbuf(scene, seqbase, false);
   }
   else if (ELEM(seq->type, SEQ_TYPE_SOUND_RAM, SEQ_TYPE_SOUND_HD)) {
     bSound *sound = seq->sound;
@@ -2906,8 +2895,10 @@ static int sequencer_change_path_exec(bContext *C, wmOperator *op)
     prop = RNA_struct_find_property(&seq_ptr, "filepath");
     RNA_property_string_set(&seq_ptr, prop, filepath);
     RNA_property_update(C, &seq_ptr, prop);
+    SEQ_relations_sequence_free_anim(seq);
   }
 
+  SEQ_relations_invalidate_cache_raw(scene, seq);
   WM_event_add_notifier(C, NC_SCENE | ND_SEQUENCER, scene);
 
   return OPERATOR_FINISHED;
diff --git a/source/blender/imbuf/intern/anim_movie.c b/source/blender/imbuf/intern/anim_movie.c
index c11c6d778a1..87f2fd124c0 100644
--- a/source/blender/imbuf/intern/anim_movie.c
+++ b/source/blender/imbuf/intern/anim_movie.c
@@ -939,14 +939,36 @@ static void ffmpeg_postprocess(struct anim *anim)
   }
 }
 
-/* decode one video frame also considering the packet read into cur_packet */
+static void ffmpeg_decode_store_frame_pts(struct anim *anim)
+{
+  anim->cur_pts = av_get_pts_from_frame(anim->pFrame);
+
+  if (anim->pFrame->key_frame) {
+    anim->cur_key_frame_pts = anim->cur_pts;
+  }
+
+  av_log(anim->pFormatCtx,
+         AV_LOG_DEBUG,
+         "  FRAME DONE: cur_pts=%" PRId64 ", guessed_pts=%" PRId64 "\n",
+         (anim->pFrame->pts == AV_NOPTS_VALUE) ? -1 : (int64_t)anim->pFrame->pts,
+         (int64_t)anim->cur_pts);
+}
 
+/* decode one video frame also considering the packet read into cur_packet */
 static int ffmpeg_decode_video_frame(struct anim *anim)
 {
-  int rval = 0;
-
   av_log(anim->pFormatCtx, AV_LOG_DEBUG, "  DECODE VIDEO FRAME\n");
 
+  /* Sometimes, decoder returns more than one frame per sent packet. Check if frames are available.
+   * This frames must be read, otherwise decoding will fail. See T91405. */
+  anim->pFrameComplete = avcodec_receive_frame(anim->pCodecCtx, anim->pFrame) == 0;
+  if (anim->pFrameComplete) {
+    av_log(anim->pFormatCtx, AV_LOG_DEBUG, "  DECODE FROM CODEC BUFFER\n");
+    ffmpeg_decode_store_frame_pts(anim);
+    return 1;
+  }
+
+  int rval = 0;
   if (anim->cur_packet->stream_index == anim->videoStream) {
     av_packet_unref(anim->cur_packet);
     anim->cur_packet->stream_index = -1;
@@ -963,22 +985,11 @@ static int ffmpeg_decode_video_frame(struct anim *anim)
            (anim->cur_packet->pts == AV_NOPTS_VALUE) ? -1 : (int64_t)anim->cur_packet->pts,
            (anim->cur_packet->flags & AV_PKT_FLAG_KEY) ? " KEY" : "");
     if (anim->cur_packet->stream_index == anim->videoStream) {
-      anim->pFrameComplete = 0;
-
       avcodec_send_packet(anim->pCodecCtx, anim->cur_packet);
       anim->pFrameComplete = avcodec_receive_frame(anim->pCodecCtx, anim->pFrame) == 0;
 
       if (anim->pFrameComplete) {
-        anim->cur_pts = av_get_pts_from_frame(anim->pFrame);
-
-        if (anim->pFrame->key_frame) {
-          anim->cur_key_frame_pts = anim->cur_pts;
-        }
-        av_log(anim->pFormatCtx,
-               AV_LOG_DEBUG,
-               "  FRAME DONE: cur_pts=%" PRId64 ", guessed_pts=%" PRId64 "\n",
-               (anim->pFrame->pts == AV_NOPTS_VALUE) ? -1 : (int64_t)anim->pFrame->pts,
-               (int64_t)anim->cur_pts);
+        ffmpeg_decode_store_frame_pts(anim);
         break;
       }
     }
@@ -988,22 +999,11 @@ static int ffmpeg_decode_video_frame(struct anim *anim)
 
   if (rval == AVERROR_EOF) {
     /* Flush any remaining frames out of the decoder. */
-    anim->pFrameComplete = 0;
-
     avcodec_send_packet(anim->pCodecCtx, NULL);
     anim->pFrameComplete = avcodec_receive_frame(anim->pCodecCtx, anim->pFrame) == 0;
 
     if (anim->pFrameComplete) {
-      anim->cur_pts = av_get_pts_from_frame(anim->pFrame);
-
-      if (anim->pFrame->key_frame) {
-        anim->cur_key_frame_pts = anim->cur_pts;
-      }
-      av_log(anim->pFormatCtx,
-             AV_LOG_DEBUG,
-             "  FRAME DONE (after EOF): cur_pts=%" PRId64 ", guessed_pts=%" PRId64 "\n",
-             (anim->pFrame->pts == AV_NOPTS_VALUE) ? -1 : (int64_t)anim->pFrame->pts,
-             (int64_t)anim->cur_pts);
+      ffmpeg_decode_store_frame_pts(anim);
       rval = 0;
     }
   }
diff --git a/source/blender/makesrna/intern/rna_sequencer.c b/source/blender/makesrna/intern/rna_sequencer.c
index 21a7131c46f..61b3f1d63d6 100644
--- a/source/blender/makesrna/intern/rna_sequencer.c
+++ b/source/blender/makesrna/intern/rna_sequencer.c
@@ -2250,7 +2250,7 @@ static void rna_def_filter_video(StructRNA *srna)
   prop = RNA_def_property(srna, "use_reverse_frames", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "flag", SEQ_REVERSE_FRAMES);
   RNA_def_property_ui_text(prop, "Reverse Frames", "Reverse frame order");
-  RNA_def_property_update(prop, NC_SCENE | ND_SEQUENCER, NULL);
+  RNA_def_property_update(prop, NC_SCENE | ND_SEQUENCER, "rna_Sequence_invalidate_preprocessed_update");
 
   prop = RNA_def_property(srna, "color_multiply", PROP_FLOAT, PROP_UNSIGNED);
   RNA_def_property_float_sdna(prop, NULL, "mul");
@@ -2272,7 +2272,8 @@ static void rna_def_filter_video(StructRNA *srna)
   prop = RNA_def_property(srna, "strobe", PROP_FLOAT, PROP_NONE);
   RNA_def_property_range(prop, 1.0f, 30.0f);
   RNA_def_property_ui_text(prop, "Strobe", "Only display every nth frame");
-  RNA_def_property_update(prop, NC_SCENE | ND_SEQUENCER, NULL);
+  RNA_def_property_update(
+      prop, NC_SCENE | ND_SEQUENCER, "rna_Sequence_invalidate_preprocessed_update");
 
   prop = RNA_def_property(srna, "transform", PROP_POINTER, PROP_NONE);
   RNA_def_property_pointer_sdna(prop, NULL, "strip->transform");
diff --git a/source/blender/makesrna/intern/rna_sequencer_api.c b/source/blender/makesrna/intern/rna_sequencer_api.c
index ec6c4c2f32f..7989c316c4c 100644
--- a/source/blender/makesrna/intern/rna_sequencer_api.c
+++ b/source/blender/makesrna/intern/rna_sequencer_api.c
@@ -59,6 +59,7 @@
 #  include "SEQ_relations.h"
 #  include "SEQ_render.h"
 #  include "SEQ_sequencer.h"
+#  include "SEQ_time.h"
 
 #  include "WM_api.h"
 
@@ -69,7 +70,7 @@ static void rna_Sequence_update_rnafunc(ID *id, Sequence *self, bool do_data)
   ListBase *seqbase = SEQ_get_seqbase_by_seq(&ed->seqbase, self);
 
   if (do_data) {
-    SEQ_relations_update_changed_seq_and_deps(scene, self, true, true);
+    SEQ_time_update_recursive(scene, self);
     // new_tstripdata(self); /* need 2.6x version of this. */
   }
 
diff --git a/source/blender/sequencer/SEQ_relations.h b/source/blender/sequencer/SEQ_relations.h
index 54e53193b48..3b9d430a3c9 100644
--- a/source/blender/sequencer/SEQ_relations.h
+++ b/source/blender/sequencer/SEQ_relations.h
@@ -35,10 +35,6 @@ struct Scene;
 struct Sequence;
 
 void SEQ_relations_sequence_free_anim(struct Sequence *seq);
-void SEQ_relations_update_changed_seq_and_deps(struct Scene *scene,
-                                               struct Sequence *changed_seq,
-                                               int len_change,
-                                               int ibuf_change);
 bool SEQ_relations_check_scene_recursion(struct Scene *scene, struct ReportList *reports);
 bool SEQ_relations_render_loop_check(struct Sequence *seq_main, struct Sequence *seq);
 void SEQ_relations_free_imbuf(struct Scene *scene, struct ListBase *seqbasep, bool for_render);
diff --git a/source/blender/sequencer/SEQ_time.h b/source/blender/sequencer/SEQ_time.h
index df3c9a40409..a0abaf8813a 100644
--- a/source/blender/sequencer/SEQ_time.h
+++ b/source/blender/sequencer/SEQ_time.h
@@ -45,6 +45,7 @@ int SEQ_time_find_next_prev_edit(struct Scene *scene,
                                  const bool do_center,
                                  const bool do_unselected);
 void SEQ_time_update_sequence(struct Scene *scene, struct ListBase *seqbase, struct Sequence *seq);
+void SEQ_time_update_recursive(struct Scene *scene, struct Sequence *changed_seq);
 bool SEQ_time_strip_intersects_frame(const struct Sequence *seq, const int timeline_frame);
 void SEQ_time_update_meta_strip_range(struct Scene *scene, struct Sequence *seq_meta);
 
diff --git a/source/blender/sequencer/intern/render.c b/source/blender/sequencer/intern/render.c
index 4405253586b..12d97d7e3e3 100644
--- a/source/blender/sequencer/intern/render.c
+++ b/source/blender/sequencer/intern/render.c
@@ -1181,7 +1181,8 @@ static ImBuf *seq_render_movieclip_strip(const SeqRenderData *context,
   /* Try to get a proxy image. */
   ibuf = seq_get_movieclip_ibuf(seq, user);
 
-  if (ibuf != NULL && psize != IMB_PROXY_NONE) {
+  /* If clip doesn't use proxies, it will fallback to full size render of original file. */
+  if (ibuf != NULL && psize != IMB_PROXY_NONE && BKE_movieclip_proxy_enabled(seq->clip)) {
     *r_is_proxy_image = true;
   }
 
diff --git a/source/blender/sequencer/intern/strip_add.c b/source/blender/sequencer/intern/strip_add.c
index 6f635b5db5f..70ac2620e20 100644
--- a/source/blender/sequencer/intern/strip_add.c
+++ b/source/blender/sequencer/intern/strip_add.c
@@ -248,7 +248,6 @@ Sequence *SEQ_add_effect_strip(Scene *scene, ListBase *seqbase, struct SeqLoadDa
     SEQ_transform_set_right_handle_frame(seq, load_data->effect.end_frame);
   }
 
-  SEQ_relations_update_changed_seq_and_deps(scene, seq, 1, 1); /* Runs SEQ_time_update_sequence. */
   seq_add_set_name(scene, seq, load_data);
   seq_add_generic_update(scene, seqbase, seq);
 
@@ -798,6 +797,7 @@ void SEQ_add_reload_new_file(Main *bmain, Scene *scene, Sequence *seq, const boo
 
   ListBase *seqbase = SEQ_active_seqbase_get(SEQ_editing_get(scene));
   SEQ_time_update_sequence(scene, seqbase, seq);
+  SEQ_relations_invalidate_cache_raw(scene, seq);
 }
 
 void SEQ_add_movie_reload_if_needed(struct Main *bmain,
diff --git a/source/blender/sequencer/intern/strip_relations.c b/source/blender/sequencer/intern/strip_relations.c
index d17a37cb9d8..e6d9cd330b3 100644
--- a/source/blender/sequencer/intern/strip_relations.c
+++ b/source/blender/sequencer/intern/strip_relations.c
@@ -281,80 +281,6 @@ void SEQ_relations_free_imbuf(Scene *scene, ListBase *seqbase, bool for_render)
   }
 }
 
-static bool update_changed_seq_recurs(
-    Scene *scene, Sequence *seq, Sequence *changed_seq, int len_change, int ibuf_change)
-{
-  Sequence *subseq;
-  bool free_imbuf = false;
-
-  /* recurse downwards to see if this seq depends on the changed seq */
-
-  if (seq == NULL) {
-    return false;
-  }
-
-  if (seq == changed_seq) {
-    free_imbuf = true;
-  }
-
-  for (subseq = seq->seqbase.first; subseq; subseq = subseq->next) {
-    if (update_changed_seq_recurs(scene, subseq, changed_seq, len_change, ibuf_change)) {
-      free_imbuf = true;
-    }
-  }
-
-  if (seq->seq1) {
-    if (update_changed_seq_recurs(scene, seq->seq1, changed_seq, len_change, ibuf_change)) {
-      free_imbuf = true;
-    }
-  }
-  if (seq->seq2 && (seq->seq2 != seq->seq1)) {
-    if (update_changed_seq_recurs(scene, seq->seq2, changed_seq, len_change, ibuf_change)) {
-      free_imbuf = true;
-    }
-  }
-  if (seq->seq3 && (seq->seq3 != seq->seq1) && (seq->seq3 != seq->seq2)) {
-    if (update_changed_seq_recurs(scene, seq->seq3, changed_seq, len_change, ibuf_change)) {
-      free_imbuf = true;
-    }
-  }
-
-  if (free_imbuf) {
-    if (ibuf_change) {
-      if (seq->type == SEQ_TYPE_MOVIE) {
-        SEQ_relations_sequence_free_anim(seq);
-      }
-      else if (seq->type == SEQ_TYPE_SPEED) {
-        seq_effect_speed_rebuild_map(scene, seq);
-      }
-    }
-
-    if (len_change) {
-      ListBase *seqbase = SEQ_active_seqbase_get(SEQ_editing_get(scene));
-      SEQ_time_update_sequence(scene, seqbase, seq);
-    }
-  }
-
-  return free_imbuf;
-}
-
-void SEQ_relations_update_changed_seq_and_deps(Scene *scene,
-                                               Sequence *changed_seq,
-                                               int len_change,
-                                               int ibuf_change)
-{
-  Editing *ed = SEQ_editing_get(scene);
-  Sequence *seq;
-
-  if (ed == NULL) {
-    return;
-  }
-
-  for (seq = ed->seqbase.first; seq; seq = seq->next) {
-    update_changed_seq_recurs(scene, seq, changed_seq, len_change, ibuf_change);
-  }
-}
-
 static void sequencer_all_free_anim_ibufs(ListBase *seqbase, int timeline_frame)
 {
   for (Sequence *seq = seqbase->first; seq != NULL; seq = seq->next) {
diff --git a/source/blender/sequencer/intern/strip_time.c b/source/blender/sequencer/intern/strip_time.c
index 92ac580f3b1..a8e07f37a0b 100644
--- a/source/blender/sequencer/intern/strip_time.c
+++ b/source/blender/sequencer/intern/strip_time.c
@@ -267,6 +267,65 @@ void SEQ_time_update_sequence(Scene *scene, ListBase *seqbase, Sequence *seq)
   seq_time_update_sequence_bounds(scene, seq);
 }
 
+static bool update_changed_seq_recurs(Scene *scene, Sequence *seq, Sequence *changed_seq)
+{
+  Sequence *subseq;
+  bool do_update = false;
+
+  /* recurse downwards to see if this seq depends on the changed seq */
+
+  if (seq == NULL) {
+    return false;
+  }
+
+  if (seq == changed_seq) {
+    do_update = true;
+  }
+
+  for (subseq = seq->seqbase.first; subseq; subseq = subseq->next) {
+    if (update_changed_seq_recurs(scene, subseq, changed_seq)) {
+      do_update = true;
+    }
+  }
+
+  if (seq->seq1) {
+    if (update_changed_seq_recurs(scene, seq->seq1, changed_seq)) {
+      do_update = true;
+    }
+  }
+  if (seq->seq2 && (seq->seq2 != seq->seq1)) {
+    if (update_changed_seq_recurs(scene, seq->seq2, changed_seq)) {
+      do_update = true;
+    }
+  }
+  if (seq->seq3 && (seq->seq3 != seq->seq1) && (seq->seq3 != seq->seq2)) {
+    if (update_changed_seq_recurs(scene, seq->seq3, changed_seq)) {
+      do_update = true;
+    }
+  }
+
+  if (do_update) {
+    ListBase *seqbase = SEQ_active_seqbase_get(SEQ_editing_get(scene));
+    SEQ_time_update_sequence(scene, seqbase, seq);
+  }
+
+  return do_update;
+}
+
+void SEQ_time_update_recursive(Scene *scene, Sequence *changed_seq)
+{
+  Editing *ed = SEQ_editing_get(scene);
+  Sequence *seq;
+
+  if (ed == NULL) {
+    return;
+  }
+
+  for (seq = ed->seqbase.first; seq; seq = seq->next) {
+    update_changed_seq_recurs(scene, seq, changed_seq);
+  }
+}
+
 int SEQ_time_find_next_prev_edit(Scene *scene,
                                  int timeline_frame,
                                  const short side,