Call av_log_set_level() after loading ffmpegsumo.dll.

media/base/media_win.cc

 // Copyright (c) 2012 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/base/media.h"
 
 #include <windows.h>
 #if defined(_WIN32_WINNT_WIN8)
 // The Windows 8 SDK defines FACILITY_VISUALCPP in winerror.h.
 #undef FACILITY_VISUALCPP
 #endif
 #include <delayimp.h>
 
 #include "base/files/file_path.h"
+#include "media/ffmpeg/ffmpeg_common.h"
 
 #pragma comment(lib, "delayimp.lib")
 
 namespace media {
 namespace internal {
 
 bool InitializeMediaLibraryInternal(const base::FilePath& module_dir) {
   // LoadLibraryEx(..., LOAD_WITH_ALTERED_SEARCH_PATH) cannot handle
   // relative path.
   if (!module_dir.IsAbsolute())
     return false;
 
   // Use alternate DLL search path so we don't load dependencies from the
   // system path.  Refer to http://crbug.com/35857
   static const char kFFmpegDLL[] = "ffmpegsumo.dll";
   HMODULE lib = ::LoadLibraryEx(
       module_dir.AppendASCII(kFFmpegDLL).value().c_str(), NULL,
       LOAD_WITH_ALTERED_SEARCH_PATH);
 
-  // Check that we loaded the library successfully.
-  return lib != NULL;
+  bool initialized = (lib != NULL);
+
+  // TODO(scherkus): Remove all the bool-ness from these functions as we no
+  // longer support disabling HTML5 media at runtime. http://crbug.com/440892
+  CHECK(initialized);
+
+  // VS2013 has a bug where FMA3 instructions will be executed on CPUs that

[DaleCurtis, 2014/12/12 22:58:01]

An alternative to doing this is to add the code to av_rdft_init():

https://code.google.com/p/chromium/codesearch#chromium/src/third_party/ffmpeg...

+  // support them despite them being disabled at the OS level, causing illegal
+  // instruction exceptions. Because Web Audio's FFT code *might* run before
+  // HTML5 media code, call av_log_set_level() to force library initialziation.
+  // See http://crbug.com/440892 for details.
+  av_log_set_level(AV_LOG_QUIET);
+
+  return initialized;
 }
 
 }  // namespace internal
 }  // namespace media