diff -up chromium-48.0.2564.8/media/ffmpeg/ffmpeg_common.h.disable_ffmpeg_api_change chromium-48.0.2564.8/media/ffmpeg/ffmpeg_common.h
--- chromium-48.0.2564.8/media/ffmpeg/ffmpeg_common.h.disable_ffmpeg_api_change	2015-11-18 13:16:05.867971946 +0100
+++ chromium-48.0.2564.8/media/ffmpeg/ffmpeg_common.h	2015-11-18 13:19:20.130249467 +0100
@@ -22,18 +22,6 @@
 
 // Include FFmpeg header files.
 extern "C" {
-// Disable deprecated features which result in spammy compile warnings.  This
-// list of defines must mirror those in the 'defines' section of FFmpeg's
-// BUILD.gn file or the headers below will generate different structures!
-#define FF_API_CONVERGENCE_DURATION 0
-// Upstream libavcodec/utils.c still uses the deprecated
-// av_dup_packet(), causing deprecation warnings.
-// The normal fix for such things is to disable the feature as below,
-// but the upstream code does not yet compile with it disabled.
-// (In this case, the fix is replacing the call with a new function.)
-// In the meantime, we directly disable those warnings in the C file.
-//#define FF_API_AVPACKET_OLD_API 0
-
 // Temporarily disable possible loss of data warning.
 // TODO(scherkus): fix and upstream the compiler warnings.
 MSVC_PUSH_DISABLE_WARNING(4244);
--- chromium-55.0.2873.0/third_party/ffmpeg/BUILD.gn.disable_ffmpeg_api_change	2016-09-28 07:51:54.000000000 +0200
+++ chromium-55.0.2873.0/third_party/ffmpeg/BUILD.gn	2016-10-01 13:44:59.429129847 +0200
@@ -144,17 +144,6 @@
     "_POSIX_C_SOURCE=200112",
     "_XOPEN_SOURCE=600",
     "PIC",
-    # Disable deprecated features that generate spammy warnings.
-    # media/ffmpeg/ffmpeg_common.h defines these as well and must be kept
-    # in sync with this file.
-    "FF_API_CONVERGENCE_DURATION=0",
-    # Upstream libavcodec/utils.c still uses the deprecated
-    # av_dup_packet(), causing deprecation warnings.
-    # The normal fix for such things is to disable the feature as below,
-    # but the upstream code does not yet compile with it disabled.
-    # (In this case, the fix is replacing the call with a new function.)
-    # In the meantime, we directly disable those warnings in the C file.
-    # "FF_API_AVPACKET_OLD_API=0",
   ]
 
   # So we can append below and assume they're defined.