Jetifier does not convert support dependencies

I cloned ExoPlayer locally and added the modules to my existing project using my settings.gradle as described in the documentation:

gradle.ext.exoplayerRoot = 'path/to/exoplayer' gradle.ext.exoplayerModulePrefix = 'exoplayer-' apply from: new File(gradle.ext.exoplayerRoot, 'core_settings.gradle') 

Whenever I try to build the project, I receive the following build error:

error: package android.support.annotation does not exist

These happen for all @NonNull and @Nullable annotations in the ExoPlayer modules.

I created a new project in Android Studio 3.2.1, added AndroidX support in my gradle.properties file and updated my build.gradle file accordingly.

build.gradle

android { compileSdkVersion 28 defaultConfig { minSdkVersion 26 targetSdkVersion 28 versionCode 1 versionName "1.0" } dataBinding { enabled = true } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) //ExoPlayer implementation project(':exoplayer-library-core') } 

gradle.properties

org.gradle.jvmargs=-Xmx1536m android.databinding.enableV2=true android.useAndroidX=true android.enableJetifier=true 

If I understand correctly, Jetifier should be able to resolve and convert the support dependencies to AndroidX dependencies, but this does not seem to be the case for these local modules.