Android app works locally, but not when published to the store

Category：Android

Pub.date：2021-06-25

In Android application development, it works in simulator and actual device test with USB connection, but it does not work when published to the store.<br>
The error message is as follows.

can't play this video

## Operating environment

Android studio 4.2.1

build.gradle(Project)
```
buildscript {
    ext.kotlin_version = "1.5.10"
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.2.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}
```

build.gradle(Module)
```
plugins {
    id 'com.android.application'
    id 'kotlin-android'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

defaultConfig {
        applicationId "example"
        minSdkVersion 21
        targetSdkVersion 30
        multiDexEnabled true
        versionCode 1
        versionName "1"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables {
            useSupportLibrary true
        }
    }

buildTypes {
        release {
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }
    buildFeatures {
        viewBinding true
    }
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.5.0'
    implementation 'androidx.appcompat:appcompat:1.3.0'
    implementation 'com.google.android.material:material:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    implementation 'com.google.android.gms:play-services-ads:20.2.0'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
```

## cause

It seems that the included mp4 files are being compressed during the build process.

The file size of app-release.aab has become unusually small.

## Don't let the video be compressed.

Video<br>
app/src/main/res/raw/example.mp4

Put keep.xml in the same folder.

## keep.xml

```
<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:tools="http://schemas.android.com/tools"
	tools:keep="@raw/example"
	/>
```
Extensions are not described.

## Another idea

I tried the following, but did not get the results I expected. It may have been some bad combination.

Change the description of build.gradle(Module)
```
minifyEnabled false
```
Described in proguard-rules.pro
```
-keep class android.support.v4.media.** {*;}
```