Limit VTVideoEncodeAccelerator keyframe output

media/gpu/vt_video_encode_accelerator_mac.cc

Index: media/gpu/vt_video_encode_accelerator_mac.cc
diff --git a/media/gpu/vt_video_encode_accelerator_mac.cc b/media/gpu/vt_video_encode_accelerator_mac.cc
index 38429484b38d2528b9318fcd30a16be908876bb7..4a3b74e32be01505b2f5ba0c89bdfd02a8b1ec3b 100644
--- a/media/gpu/vt_video_encode_accelerator_mac.cc
+++ b/media/gpu/vt_video_encode_accelerator_mac.cc
@@ -560,6 +560,14 @@ bool VTVideoEncodeAccelerator::ConfigureCompressionSession() {
   rv &= session_property_setter.Set(
       videotoolbox_glue_->kVTCompressionPropertyKey_AllowFrameReordering(),
       false);
+  // Limit keyframe output to 4 minutes, see crbug.com/658429.
+  rv &= session_property_setter.Set(
+      videotoolbox_glue_->kVTCompressionPropertyKey_MaxKeyFrameInterval(),
+      7200);
+  rv &= session_property_setter.Set(
+      videotoolbox_glue_
+          ->kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration(),
+      240);
   DLOG_IF(ERROR, !rv) << " Setting session property failed.";
   return rv;
 }