ubuntu12.10+NDK r9 编译 ffmpeg 的一些参考资料Perhaps you should add the directory containing `libssl.pc'

首先入门级的 编译宝典：

https://trac.ffmpeg.org/wiki/CompilationGuide/Android

http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/

二进制文件+so库：

https://github.com/cine-io/android-ffmpeg-with-rtmp

一个利用二进制可执行文件的例子:

https://github.com/vanevery/Android-MJPEG-Video-Capture-FFMPEG

 build_android.sh参数配置参考：http://www.cnblogs.com/ohmytime/archive/2013/05/12/ffmpeg-build-help.html 

参数参考：http://www.cnblogs.com/ohmytime/archive/2013/05/12/ffmpeg-build-help.html

 其次，确定你本地的 ssh正确生成并添加到了你的github的ssh 管理列表中，下面编译需要使用。

我的rsa:参考：http://blog.csdn.net/wide288/article/details/21003749

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDC/1KQiZR/lTMYOKSUajVK/KRyn3oTOC8sIhNztoxvN36mL/B2u3bx8pUNfaFIoAQ709QDOybfXY54IbeLDr6NVzoqFpkptjB/GSG2hLoOyt4tlkfLMtFLm0OC+QjKa6b4RMdNeKUof5Qx7xvJ6E7dn7yfK4Mzt9y8RE1IF0VxJJW/RIsfgT0i9tUXXPT5Hh2DOzaT/Wza+8PeBY3NfnpoG7Yejjld9xeSV2NLLj6kbmZpBDiPDlJc1DMlcWr90VlrKWURVVEMuMbMgDE7e855hBJJMde5HMeW6xEQwuX8riCbu1rNzQam/awHj/FgMWnaZakllzPyfNdiZZhWdL9r 302940116@qq.com

这个环境的private key 我忙了一晚上 参考：https://help.github.com/articles/error-permission-denied-publickey/（从上到下一个一个验证就行）

注意点： 1.如果 在生成ssh 的时候 你给的 文件名成不是 id_rsa ，后重命名的 ssh agent 是没有的，

　　　　解决办法：进行添加

　　　　ssh-add $HOME/.ssh/id_rsa

　　　　　

下面让我们来运行https://github.com/cine-io/android-ffmpeg-with-rtmp的例子

1. 下载压缩包解压 （目录随意）

2. cd android-ffmpeg-with-rtmp

3.修改build.sh中的几个参数为你自己的路径：

　　　　

#-- try to intelligently determine where the Android NDK is installed
function find_ndk {
ndk_name="android-ndk-r9"//你的ndk存在本地的文件夹名
top_level_paths_to_search="/home/poe"//你的桌面$HOME路径
found_ndk=""
for d in $top_level_paths_to_search; do
test -d "$d" || continue
found_ndk=$(find $d -name $ndk_name -print)
test "$found_ndk" && break
done
echo "$found_ndk"
}

# create our configuration file if it doesn't yet exist
if [ ! -f "${config_file}" ]; then
# determine OS and architecture
OS_ARCH=$(uname -sm | tr 'A-Z' 'a-z' | sed "s/ /-/g")

# find / ask for the NDK
echo "Looking for the NDK ..."
NDK=$(find_ndk)
echo -n "Path to NDK [$NDK]: "
read typed_ndk_root
test "$typed_ndk_root" && NDK="$typed_ndk_root"

# save our configuration
echo "Saving configuration into ${config_file} ..."
echo "OS_ARCH=$OS_ARCH" > ${config_file}
echo "NDK=$NDK" >> ${config_file}
echo "SYSROOT=${NDK}/platforms/android-18/arch-arm" >> ${config_file}//因为我的是ndk-r9 所以没有android-19此处改为18
echo "TOOLCHAIN=${NDK}/toolchains/arm-linux-androideabi-4.8/prebuilt/${OS_ARCH}" >> ${config_file}
fi

继续./build.sh

open_ssl编译通过

open_rtmp编译通过

open_ffmpeg 不同过，查看 build/build.log 拖到底

patching file configure
Hunk #1 succeeded at 2727 (offset 58 lines).
Package libssl was not found in the pkg-config search path.
Perhaps you should add the directory containing `libssl.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libssl', required by 'librtmp', not found
Package libssl was not found in the pkg-config search path.
Perhaps you should add the directory containing `libssl.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libssl', required by 'librtmp', not found
ERROR: librtmp not found

If you think configure made a mistake, make sure you are using the latest
version from Git. If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solve the problem.

根据以上提示我们在编译openssl的时候缺少了libssl.pc这个pkgconfig的文件，

按照提示我们需要把对应的包管理类拷贝到 你的PKG_CONFIG_PATH

（user/lib/pkgconfig)

文件参考这里：http://www.opensource.apple.com/source/OpenSSL098/OpenSSL098-27/pkgconfigs/ 

把这几个文件

	libcrypto.pc	239
	libssl.pc	254
	openssl.pc	264

 

都拷贝到上面路径。

删除已经编译的缓存

$ rm -rf src build .build-config.sh
$ ./build.sh

编译通过！

.
├── bin
│   ├── ffmpeg
│   ├── openssl
│   └── ssltest
└── lib
    ├── libavcodec-56.so
    ├── libavdevice-56.so
    ├── libavfilter-5.so
    ├── libavformat-56.so
    ├── libavutil-54.so
    ├── libcrypto.so
    ├── librtmp-1.so
    ├── libssl.so
    ├── libswresample-1.so
    └── libswscale-3.so

 通过解压demo解压到制定内部文件目录发现二进制文件ffmpeg只有200k,发现无法运行。

　http://blog.csdn.net/sxsj333/article/details/6929487

费解了，直接在 ubuntu系统执行也提示我无法执行，那么肯定是编译时候的问题了。

仔细研究参数从新编译：

我只要动态库，--disable-static

 　　　　　　　--enable-shared

http://www.cnblogs.com/ohmytime/archive/2013/05/12/ffmpeg-build-help.html