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Question: How to fucking add JavaCV to Android Studio so I can use the fucking annoying FFmpeg?

Answer: This tut will use JavaCV 1.1, version 1.2 currently has SIGSEGV issue. JavaCV 1.1 comes with FFmpeg 2.8.1.

1. Obtain the prebulit binaries here.
2. Extract it and copy these files:

• javacpp.jar (essential).
• javacv.jar (essential).
• ffmpeg.jar (essential if you use FFmpeg).
• ffmpeg-android-arm.jar (for arm CPU).
• ffmpeg-android-x86.jar (optional for x86 CPU). into the libs folder of your project (app/libs in my case).

1. Click on app -> F4 -> Dependencies -> + -> File dependencies -> choose all the previous .jar.
2. Temporarily, because of this issue, we need to set targetSdkVersion 22 the app's build.gradle.
3. Possibly need to set these packagingOptions in the build.gradle:

android {
  compileSdkVersion 23
  buildToolsVersion "23.0.3"

  defaultConfig {
      applicationId "com.example.test"
      minSdkVersion 16
      targetSdkVersion 22
      versionCode 1
      versionName "1.0"
  }
  
  packagingOptions {
      exclude 'META-INF/LICENSE.txt'
      exclude 'META-INF/NOTICE.txt'
      exclude 'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.properties'
      exclude 'META-INF/maven/org.bytedeco.javacpp-presets/ffmpeg/pom.xml'
      
      //might need these if you use openCV
      //exclude 'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.properties'
      //exclude 'META-INF/maven/org.bytedeco.javacpp-presets/opencv/pom.xml'
  }
}

To play overlay at different time, see second link.