VSE: Build proxies only for slow movies

This change applies only for automatic proxy building, when strip
is added to timeline. Manual building process is not affected.

Don't build proxy file if movie is already fast enough to seek.
To determine seek performance, check if whole GOP can be decoded
in 100 milliseconds.

To consider some variation in GOP size, large number of packets are
read, assuming that each packet will produce 1 frame. While this is not
technically correct, it does give quite accurate estimate of maximum GOP
size.

This test will ensure consistent performance on wide array of machines.
Check should be done in order of few milliseconds.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D11671

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/editors/space_clip/clip_ops.c b/source/blender/editors/space_clip/clip_ops.c
index ef522e57d02..03b6d8c7381 100644
--- a/source/blender/editors/space_clip/clip_ops.c
+++ b/source/blender/editors/space_clip/clip_ops.c
@@ -1560,7 +1560,8 @@ static int clip_rebuild_proxy_exec(bContext *C, wmOperator *UNUSED(op))
                                                        clip->proxy.build_size_flag,
                                                        clip->proxy.quality,
                                                        true,
-                                                       NULL);
+                                                       NULL,
+                                                       false);
   }
 
   WM_jobs_customdata_set(wm_job, pj, proxy_freejob);