diff --git a/aegisub/build/BuildTasks/BuildTasks.fs b/aegisub/build/BuildTasks/BuildTasks.fs
index f4514a16b..7d9ebfbd3 100644
--- a/aegisub/build/BuildTasks/BuildTasks.fs
+++ b/aegisub/build/BuildTasks/BuildTasks.fs
@@ -77,7 +77,7 @@ type ShellWrapper(props : Map<String, String>) =
     this.EnvironmentVariables <- [|
       "CC=cl";
       "CPP=cl -E";
-      "CFLAGS=-nologo";
+      "CFLAGS=-nologo"
       "PATH=" + props.["MsysBasePath"] + "\\bin;" + props.["NativeExecutablePath"];
       "INCLUDE=" + props.["AegisubSourceBase"] + "//include;" + props.["IncludePath"];
       "LIB=" + props.["AegisubLibraryDir"] + ";" + props.["LibraryPath"];
diff --git a/aegisub/build/ffmpeg/dynamic_msvcrt.h b/aegisub/build/ffmpeg/dynamic_msvcrt.h
new file mode 100644
index 000000000..74c15cd65
--- /dev/null
+++ b/aegisub/build/ffmpeg/dynamic_msvcrt.h
@@ -0,0 +1,34 @@
+// Copyright (c) 2012, Thomas Goyne <plorkyeran@aegisub.org>
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+// Aegisub Project http://www.aegisub.org/
+
+// FFmpeg/libav replace these standard library functions with their own
+// implementations by #defining them to avpriv_fn, which results in them
+// being declared as __declspec(dllimport) when dynamically linking the
+// runtime. To fix this, redeclare them correctly.
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+// Disable the inconsistent dll linkage warning since that's the entire
+// point of this
+#pragma warning( push )
+#pragma warning( disable: 4273 )
+int avpriv_snprintf(char *s, size_t n, const char *fmt, ...);
+int avpriv_vsnprintf(char *s, size_t n, const char *fmt, va_list ap);
+double avpriv_strtod(const char *nptr, char **endptr);
+#pragma warning( pop )
+
diff --git a/aegisub/build/ffmpeg/ffmpeg.vcxproj b/aegisub/build/ffmpeg/ffmpeg.vcxproj
index 5f970bf9e..7bba8d9ed 100644
--- a/aegisub/build/ffmpeg/ffmpeg.vcxproj
+++ b/aegisub/build/ffmpeg/ffmpeg.vcxproj
@@ -36,8 +36,8 @@
   <UsingTask TaskName="UpdateFile" AssemblyFile="$(AegisubBinaryDir)BuildTasks.dll" />
 
   <PropertyGroup Label="ConfigArgs">
-    <CfgEnableDebug Condition="'$(Configuration)' == 'Debug'">--enable-debug --disable-stripping</CfgEnableDebug>
-    <CfgEnableDebug Condition="'$(Configuration)' == 'Release'">--disable-debug</CfgEnableDebug>
+    <CfgDebug Condition="'$(Configuration)' == 'Debug'">--enable-debug --disable-stripping --extra-cflags=-MDd</CfgDebug>
+    <CfgDebug Condition="'$(Configuration)' == 'Release'">--disable-debug --extra-cflags=-MD</CfgDebug>
     <CfgArgs>
       --disable-avfilter
       --disable-avresample
@@ -61,6 +61,9 @@
       --enable-runtime-cpudetect
       --enable-static
       --extra-cflags=-D_SYSCRT
+      --extra-cflags=-wd4005
+      --extra-cflags=-wd4189
+      --extra-cflags=-FI$(MSBuildThisFileDirectory)dynamic_msvcrt.h
       --toolchain=msvc
       $(CfgEnableDebug)
     </CfgArgs>
diff --git a/aegisub/build/ffms2/ffms2.vcxproj b/aegisub/build/ffms2/ffms2.vcxproj
index 5cb0f3968..8f4872b84 100644
--- a/aegisub/build/ffms2/ffms2.vcxproj
+++ b/aegisub/build/ffms2/ffms2.vcxproj
@@ -56,18 +56,6 @@
     </Link>
   </ItemDefinitionGroup>
 
-  <ItemDefinitionGroup Condition="'$(Configuration)'=='Debug'">
-    <ClCompile>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-    </ClCompile>
-  </ItemDefinitionGroup>
-
-  <ItemDefinitionGroup Condition="'$(Configuration)'=='Release'">
-    <ClCompile>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-    </ClCompile>
-  </ItemDefinitionGroup>
-
   <!-- Source files -->
   <ItemGroup>
     <InstallHeader Include="$(FfmsSrcDir)\include\ffms.h" />
@@ -90,4 +78,13 @@
     <ClInclude Include="$(FfmsSrcDir)\src\config\msvc-config.h" />
     <ClInclude Include="$(FfmsSrcDir)\src\core\*.h" />
   </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ffmpeg\ffmpeg.vcxproj">
+      <Project>{f934ab7b-186b-4e96-b20c-a58c38c1b819}</Project>
+    </ProjectReference>
+    <ProjectReference Include="..\zlib\zlib.vcxproj">
+      <Project>{10f22a5a-dd9e-44a1-ba2e-2a9a7c78b0ee}</Project>
+    </ProjectReference>
+  </ItemGroup>
 </Project>