Add patches for block-level quant in theora, -O2 on build, and statically link pthread on Windows

README.chromium

Index: README.chromium
===================================================================
--- README.chromium	(revision 22704)
+++ README.chromium	(working copy)
@@ -5,10 +5,21 @@
   git://gitorious.org/~astrange/ffmpeg/ffmpeg-mt.git
   Commit: 42b521db9177ed2d4e62845659fdcd44c59757f9
 
+The Theora patches are also from the ffmpeg-mt branch above.  The git commit
+numbers and the corresponding svn revisions for them from ffmpeg mainline can
+be found at the top of each patch.
+
 The libswscale source is from the public libswscale repository:
   git://git.ffmpeg.org/libswscale
   Commit: 69fc1002e2c92aac84dccc5047141feefc94b309
 
+The static_pthread_O2.patch does two things.  First, it uses -O2 instead of
+-O3 to build ffmpeg.  This yields a significant savings in binary size, and
+also seems to improve performance (lower CPU usage).  Second, the patch adds
+a modification that statically links pthreadGC2 into avcodec-52.dll on an
+MSYS/MinGW build in Windows.  This reduces the number of DLLs required for
+distribution, and lowers the total size of the binaries.
+
 Steps for extracting:
   1) Extract ffmpeg-mt, which creates the directory ffmpeg-mt:
        tar xzvf ffmpeg-mt.tar.gz
@@ -16,6 +27,16 @@
        cd ffmpeg-mt
   3) Extract libswscale in place:
        tar xzvf ../libswscale.tar.gz
+  4) Apply the Theora patches:
+       patch -p1 < ../r18986_theora_block_quant.patch
+       patch -p1 < ../r19351_theora_decode_tables_limit127.patch
+       patch -p1 < ../r19356_theora_decode_init_error_passing.patch
+       patch -p1 < ../r19350_init_loop_filter_127fix.patch
+       patch -p1 < ../r19355_invalid_huffman_table.patch
+  5) Apply the static_pthread_O2.patch:
+       patch -p1 < ../static_pthread_O2.patch
+  6) If on mac, apply the mac_install_name.patch:
+       patch -p1 < ../mac_install_name.patch
 
 NOTE: Under Windows it is recommended to use Chromium's MinGW/MSYS environment
 or 7-Zip to extract the archives.  We've experienced issues when using WinRAR.
@@ -53,10 +74,9 @@
 If building on Windows with Chromium's MinGW/MSYS environment, add the following:
               --target-os=mingw32 --enable-memalign-hack --cc=gcc-sjlj
 
-If building on Mac, apply the mac_install_name.patch first so that the configure
-script will generate dylibs that know how to locate themselves in an application
-package.
-  patch -p1 < mac_install_name.patch
+If building on Mac, do not forget to do step (6) of the extraction to apply the
+mac_install_name.patch first so that the configure script will generate dylibs
+that know how to locate themselves in an application package.
 
 To build:
   make