title: Build ffmpeg in ijkplayer
body: <p>I am trying to do a build of ffmpeg inside ijkplayer and following this link to do a manual install <a href="https://github.com/Bilibili/ijkplayer" rel="nofollow">https://github.com/Bilibili/ijkplayer</a>. I downloaded the ndk and setup the path and setup the path for sdks and then compiling ffmpeg.</p>
  
  <p>previously, it shows to use ndk9 or later and found out from an post to change to 
  <strong>do-compile-ffmpeg.sh</strong> from <strong>compile-ffmpeg.sh</strong>. I changed the file according to ndk-11 now its showing me the below line to specify the architechture. Where to mention that architecture.</p>
  
  <pre><code>./do-compile-ffmpeg.sh
   ====================
   [*] check env 
   ====================
   build on Darwin x86_64
   ANDROID_SDK=/username/Library/Android/sdk
   ANDROID_NDK=/Users/username/Documents/android-ndk-r11c
   You must specific an architecture 'arm, armv7a, x86, ...'.
  </code></pre>