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, 2 deletions

diff --git a/source/blender/editors/space_sequencer/sequencer_proxy.c b/source/blender/editors/space_sequencer/sequencer_proxy.c
index 0a8eb7cb88f..fb561025da2 100644
--- a/source/blender/editors/space_sequencer/sequencer_proxy.c
+++ b/source/blender/editors/space_sequencer/sequencer_proxy.c
@@ -85,7 +85,7 @@ static void seq_proxy_build_job(const bContext *C, ReportList *reports)
     }
 
     bool success = SEQ_proxy_rebuild_context(
-        pj->main, pj->depsgraph, pj->scene, seq, file_list, &pj->queue);
+        pj->main, pj->depsgraph, pj->scene, seq, file_list, &pj->queue, false);
 
     if (!success && (seq->strip->proxy->build_flags & SEQ_PROXY_SKIP_EXISTING) != 0) {
       BKE_reportf(reports, RPT_WARNING, "Overwrite is not checked for %s, skipping", seq->name);
@@ -137,7 +137,7 @@ static int sequencer_rebuild_proxy_exec(bContext *C, wmOperator *UNUSED(op))
       short stop = 0, do_update;
       float progress;
 
-      SEQ_proxy_rebuild_context(bmain, depsgraph, scene, seq, file_list, &queue);
+      SEQ_proxy_rebuild_context(bmain, depsgraph, scene, seq, file_list, &queue, false);
 
       for (link = queue.first; link; link = link->next) {
         struct SeqIndexBuildContext *context = link->data;