Fix T49027: Sequence uses too much memory when rendering scene with lots of movie strips

Now we free sequencer cache and close all unneeded FFmpeg handles when rendering.
This is the same logic as image sequence memory freeding.

3 files changed, 31 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_sequencer.h b/source/blender/blenkernel/BKE_sequencer.h
index 30bb6954019..811e9136fc9 100644
--- a/source/blender/blenkernel/BKE_sequencer.h
+++ b/source/blender/blenkernel/BKE_sequencer.h
@@ -477,4 +477,6 @@ struct ImBuf *BKE_sequencer_render_mask_input(
         int cfra, int fra_offset, bool make_float);
 void BKE_sequencer_color_balance_apply(struct StripColorBalance *cb, struct ImBuf *ibuf, float mul, bool make_float, struct ImBuf *mask_input);
 
+void BKE_sequencer_all_free_anim_ibufs(int cfra);
+
 #endif  /* __BKE_SEQUENCER_H__ */
diff --git a/source/blender/blenkernel/intern/sequencer.c b/source/blender/blenkernel/intern/sequencer.c
index 6067a8b2d9b..b2a19c59084 100644
--- a/source/blender/blenkernel/intern/sequencer.c
+++ b/source/blender/blenkernel/intern/sequencer.c
@@ -5595,3 +5595,31 @@ int BKE_sequencer_find_next_prev_edit(
 
 	return best_frame;
 }
+
+static void sequencer_all_free_anim_ibufs(ListBase *seqbase, int cfra)
+{
+	for (Sequence *seq = seqbase->first; seq != NULL; seq = seq->next) {
+		if (seq->enddisp < cfra || seq->startdisp > cfra) {
+			BKE_sequence_free_anim(seq);
+		}
+		if (seq->type == SEQ_TYPE_META) {
+			sequencer_all_free_anim_ibufs(&seq->seqbase, cfra);
+		}
+	}
+}
+
+void BKE_sequencer_all_free_anim_ibufs(int cfra)
+{
+	BKE_sequencer_cache_cleanup();
+	for (Scene *scene = G.main->scene.first;
+	     scene != NULL;
+	     scene = scene->id.next)
+	{
+		Editing *ed = BKE_sequencer_editing_get(scene, false);
+		if (ed == NULL) {
+			/* Ignore scenes without sequencer. */
+			continue;
+		}
+		sequencer_all_free_anim_ibufs(&ed->seqbase, cfra);
+	}
+}
diff --git a/source/blender/render/intern/source/pipeline.c b/source/blender/render/intern/source/pipeline.c
index 604693f486e..ec629aa2863 100644
--- a/source/blender/render/intern/source/pipeline.c
+++ b/source/blender/render/intern/source/pipeline.c
@@ -2785,6 +2785,7 @@ static void do_render_all_options(Render *re)
 
 	/* ensure no images are in memory from previous animated sequences */
 	BKE_image_all_free_anim_ibufs(re->r.cfra);
+	BKE_sequencer_all_free_anim_ibufs(re->r.cfra);
 
 	if (RE_engine_render(re, 1)) {
 		/* in this case external render overrides all */