LibreTube/app/src/main/res/xml/audio_video_settings.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <PreferenceCategory app:title="@string/wifi">

        <ListPreference
            android:icon="@drawable/ic_hd"
            app:defaultValue=""
            app:entries="@array/defres"
            app:entryValues="@array/defresValue"
            app:key="default_res"
            app:title="@string/defres"
            app:useSimpleSummaryProvider="true" />

        <ListPreference
            android:icon="@drawable/ic_headphones"
            app:defaultValue="best"
            app:entries="@array/audioQuality"
            app:entryValues="@array/audioQualityValues"
            app:key="player_audio_quality"
            app:title="@string/playerAudioQuality"
            app:useSimpleSummaryProvider="true" />

    </PreferenceCategory>

    <PreferenceCategory app:title="@string/mobile_data">

        <ListPreference
            android:icon="@drawable/ic_hd"
            app:defaultValue=""
            app:entries="@array/defres"
            app:entryValues="@array/defresValue"
            app:key="default_res_mobile"
            app:title="@string/defres"
            app:useSimpleSummaryProvider="true" />

        <ListPreference
            android:icon="@drawable/ic_headphones"
            app:defaultValue="best"
            app:entries="@array/audioQuality"
            app:entryValues="@array/audioQualityValues"
            app:key="player_audio_quality_mobile"
            app:title="@string/playerAudioQuality"
            app:useSimpleSummaryProvider="true" />

    </PreferenceCategory>

    <PreferenceCategory app:title="@string/quality">

        <ListPreference
            android:icon="@drawable/ic_videocam"
            app:defaultValue="webm"
            app:entries="@array/playerVideoFormat"
            app:entryValues="@array/playerVideoFormatValues"
            app:key="player_video_format"
            app:title="@string/playerVideoFormat"
            app:useSimpleSummaryProvider="true" />

        <ListPreference
            android:icon="@drawable/ic_music"
            app:defaultValue="all"
            app:entries="@array/playerAudioFormat"
            app:entryValues="@array/playerAudioFormatValues"
            app:key="player_audio_format"
            app:title="@string/playerAudioFormat"
            app:useSimpleSummaryProvider="true" />

    </PreferenceCategory>

    <PreferenceCategory app:title="@string/background_mode">

        <com.github.libretube.ui.views.SliderPreference
            android:icon="@drawable/ic_speed"
            app:defaultValue="1.0"
            app:key="background_playback_speed"
            app:title="@string/playback_speed" />

    </PreferenceCategory>

</PreferenceScreen>