Limit VTVideoEncodeAccelerator keyframe output

media/gpu/vt_video_encode_accelerator_mac.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/gpu/vt_video_encode_accelerator_mac.h"
 
 #include <memory>
 
 #include "base/threading/thread_task_runner_handle.h"
 #include "media/base/mac/coremedia_glue.h"
@@ skipping 542 matching lines @@
       compression_session_, videotoolbox_glue_);
   bool rv = true;
   rv &= session_property_setter.Set(
       videotoolbox_glue_->kVTCompressionPropertyKey_ProfileLevel(),
       videotoolbox_glue_->kVTProfileLevel_H264_Baseline_AutoLevel());
   rv &= session_property_setter.Set(
       videotoolbox_glue_->kVTCompressionPropertyKey_RealTime(), true);
   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;
 }
 
 void VTVideoEncodeAccelerator::DestroyCompressionSession() {
   DCHECK(thread_checker_.CalledOnValidThread() ||
          (encoder_thread_.IsRunning() &&
           encoder_thread_task_runner_->BelongsToCurrentThread()));
 
   if (compression_session_) {
     videotoolbox_glue_->VTCompressionSessionInvalidate(compression_session_);
     compression_session_.reset();
   }
 }
 
 }  // namespace media