VSE: Fix prefetch initialization sequence

In 8d1978a8e013 bmain entry is updated when prefetching is started,
but this must be done before seq_prefetch_update_context(). Otherwise
created cache keys will be incorrect.

This happens immediately after prefetch is started. When it's refreshed
problem goes away.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D9581

1 files changed, 3 insertions, 2 deletions

diff --git a/source/blender/sequencer/intern/prefetch.c b/source/blender/sequencer/intern/prefetch.c
index 65b2b6c02cf..ec0bdad28e9 100644
--- a/source/blender/sequencer/intern/prefetch.c
+++ b/source/blender/sequencer/intern/prefetch.c
@@ -505,8 +505,6 @@ static PrefetchJob *seq_prefetch_start(const SeqRenderData *context, float cfra)
       seq_prefetch_init_depsgraph(pfjob);
     }
   }
-  seq_prefetch_update_scene(context->scene);
-  seq_prefetch_update_context(context);
   pfjob->bmain = context->bmain;
 
   pfjob->cfra = cfra;
@@ -516,6 +514,9 @@ static PrefetchJob *seq_prefetch_start(const SeqRenderData *context, float cfra)
   pfjob->stop = false;
   pfjob->running = true;
 
+  seq_prefetch_update_scene(context->scene);
+  seq_prefetch_update_context(context);
+
   BLI_threadpool_remove(&pfjob->threads, pfjob);
   BLI_threadpool_insert(&pfjob->threads, pfjob);