--- a/media/filters/ffmpeg_glue.h
+++ b/media/filters/ffmpeg_glue.h
@@ -28,9 +28,9 @@
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
+#include "media/ffmpeg/ffmpeg_common.h"
 
 struct AVFormatContext;
-struct AVIOContext;
 
 namespace media {
 
--- a/media/ffmpeg/ffmpeg_common.cc.orig	2013-01-17 00:07:51.635057013 +0000
+++ b/media/ffmpeg/ffmpeg_common.cc	2013-01-17 00:15:50.867406811 +0000
@@ -85,8 +85,10 @@
       return kCodecGSM_MS;
     case AV_CODEC_ID_PCM_MULAW:
       return kCodecPCM_MULAW;
+#ifndef CHROMIUM_OMIT_AV_CODEC_ID_OPUS
     case AV_CODEC_ID_OPUS:
       return kCodecOpus;
+#endif
     default:
       DVLOG(1) << "Unknown audio CodecID: " << codec_id;
   }
@@ -130,8 +132,10 @@
       return AV_CODEC_ID_GSM_MS;
     case kCodecPCM_MULAW:
       return AV_CODEC_ID_PCM_MULAW;
+#ifndef CHROMIUM_OMIT_AV_CODEC_ID_OPUS
     case kCodecOpus:
       return AV_CODEC_ID_OPUS;
+#endif
     default:
       DVLOG(1) << "Unknown AudioCodec: " << audio_codec;
   }
@@ -149,8 +153,10 @@
       return kCodecMPEG4;
     case AV_CODEC_ID_VP8:
       return kCodecVP8;
+#ifndef CHROMIUM_OMIT_AV_CODEC_ID_VP9
     case AV_CODEC_ID_VP9:
       return kCodecVP9;
+#endif
     default:
       DVLOG(1) << "Unknown video CodecID: " << codec_id;
   }
@@ -167,8 +173,10 @@
       return AV_CODEC_ID_MPEG4;
     case kCodecVP8:
       return AV_CODEC_ID_VP8;
+#ifndef CHROMIUM_OMIT_AV_CODEC_ID_VP9
     case kCodecVP9:
       return AV_CODEC_ID_VP9;
+#endif
     default:
       DVLOG(1) << "Unknown VideoCodec: " << video_codec;
   }
--- a/media/filters/ffmpeg_demuxer.cc.orig	2013-05-09 18:04:25.089276403 +0000
+++ b/media/filters/ffmpeg_demuxer.cc	2013-05-09 18:05:16.289599070 +0000
@@ -111,12 +111,15 @@
   // Get side data if any. For now, the only type of side_data is VP8 Alpha. We
   // keep this generic so that other side_data types in the future can be
   // handled the same way as well.
-  av_packet_split_side_data(packet.get());
   int side_data_size = 0;
-  uint8* side_data = av_packet_get_side_data(
+  uint8* side_data = NULL;
+#ifndef CHROMIUM_OMIT_AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL
+  av_packet_split_side_data(packet.get());
+  side_data = av_packet_get_side_data(
       packet.get(),
       AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
       &side_data_size);
+#endif
 
   // If a packet is returned by FFmpeg's av_parser_parse2() the packet will
   // reference inner memory of FFmpeg.  As such we should transfer the packet
--- a/media/base/media_posix.cc.orig	2013-05-24 20:59:12.963046035 +0000
+++ b/media/base/media_posix.cc	2013-05-24 20:59:50.593275882 +0000
@@ -11,12 +11,15 @@
 #include "base/path_service.h"
 #include "base/strings/stringize_macros.h"
 #include "media/ffmpeg/ffmpeg_common.h"
+
+#if !defined(USE_SYSTEM_FFMPEG)
 #include "third_party/ffmpeg/ffmpeg_stubs.h"
 
 using third_party_ffmpeg::kNumStubModules;
 using third_party_ffmpeg::kModuleFfmpegsumo;
 using third_party_ffmpeg::InitializeStubs;
 using third_party_ffmpeg::StubPathMap;
+#endif
 
 namespace media {
 namespace internal {
@@ -46,6 +49,9 @@
 #endif
 
 bool InitializeMediaLibraryInternal(const base::FilePath& module_dir) {
+#if defined(USE_SYSTEM_FFMPEG)
+  return true;
+#else
   StubPathMap paths;
 
   // First try to initialize with Chrome's sumo library.
@@ -61,6 +67,7 @@
       FILE_PATH_LITERAL(DSO_NAME("avformat", AVFORMAT_VERSION))).value());
 
   return InitializeStubs(paths);
+#endif
 }
 
 }  // namespace internal