libVLCsharp.forms无法播放Android资源视频文件，而iOS可以

Question

试图在xamarinForms项目中使用libvlcsharp.forms。需要播放资源视频文件。

已安装的libVLCsharp.Forms，VideoLan.LibVLC.Android，VideoLan.LibVLC.IOS

将mp4文件复制到iosProject / Resources;标记为BundleResource。将相同文件复制到androidProject / Resources / raw;标记为AndroidResource

• iOS可以从互联网播放
• Anroid可以播放与iOS相同的在线地址
• ios可以播放资源文件
• android无法播放相同的资源文件

Error>媒体文件错误：/////BigBuckBunny.mp4

认为它不喜欢我的mp4文件格式或类似的东西。从网址下载了可以播放的文件。尝试了那个。结果相同。

帮助!!!

虽然它（android）可以通过url播放著名的BigBuckBuny> http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4，它不能播放下载并复制到AndroidProject / Resource / raw的相同视频

XAML部分：

<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ParkinsonMobileApp.Pages.PhysicalActivitiesVideoDetail"
Padding="0"
Title="HomePage"
FlowDirection="LeftToRight"
xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
ios:Page.UseSafeArea="False"
NavigationPage.HasNavigationBar="False"
xmlns:customViews="clr-namespace:ParkinsonMobileApp.Views"
BackgroundColor="White"
xmlns:vlc="clr-namespace:LibVLCSharp.Forms.Shared;assembly=LibVLCSharp.Forms"
Appearing="ContentPage_OnAppearing"
Disappearing="ContentPage_Disappearing">
<AbsoluteLayout
    Padding="0"
    Margin="0"
    HorizontalOptions="Fill"
    VerticalOptions="Fill">
    <Image
        x:Name="imgViewBackground"
        Source="viewBackgroundBlurred.png"
        Aspect="AspectFill"
        AbsoluteLayout.LayoutFlags="All"
        AbsoluteLayout.LayoutBounds="0,0,1,1" />
    <vlc:MediaPlayerElement
        x:Name="vlcPlayer"
        MediaPlayer="{Binding MediaPlayer}"
        LibVLC="{Binding LibVLC}"
        EnableRendererDiscovery="True"
        Padding="0"
        Margin="0"
        AbsoluteLayout.LayoutFlags="All"
        AbsoluteLayout.LayoutBounds="0,0,1,1" />
    <customViews:CustomNavigationBar
        HorizontalOptions="Fill"
        VerticalOptions="Start"
        Padding="0"
        Margin="0"
        AbsoluteLayout.LayoutFlags="All"
        AbsoluteLayout.LayoutBounds="0,0,1,1"
        Theme="White"
        ImgBackgroundIsVisible="False"
        ButBackDisplayed="True"
        ButsOnRightDisplayed="False"
        TitleText="Egzersiz 001"
        TitleIsDisplayed="True"
        BackgroundColor="Transparent"
        backClicked="CustomNavigationBar_backClicked" />
</AbsoluteLayout>

CodeBehind dataBinding：

void ContentPage_OnAppearing(object sender, System.EventArgs e)
    {
        base.OnAppearing();
        //pageViewModel = new VieoDetailViewModel("file://android_asset/024_1.mp4");
        //pageViewModel = new VieoDetailViewModel("024_1.mp4");
        pageViewModel = new VieoDetailViewModel("BigBuckBunny.mp4");
        BindingContext = pageViewModel;
        //MessagingCenter.Send(this, "AllowLandscape");
    }

数据绑定模型：

public class VieoDetailViewModel : ViewModelBase
{
    /// <summary>
    /// Initialize LibVLC and playback when page appears
    /// </summary>
    public VieoDetailViewModel(String filePath)
    {
        Core.Initialize();

        LibVLC = new LibVLC();

        var media = new Media(LibVLC,
            //"http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4",
            filePath,
            //FromType.FromLocation
            FromType.FromPath
            );

        MediaPlayer = new MediaPlayer(media) { EnableHardwareDecoding = true };
        //MediaPlayer = new MediaPlayer(media);
        MediaPlayer.Play(media);
    }

    /// <summary>
    /// Gets the <see cref="LibVLCSharp.Shared.LibVLC"/> instance.
    /// </summary>
    public LibVLC _LibVLC;
    public LibVLC LibVLC
    {
        get
        {
            return _LibVLC;
        }
        set
        {
            _LibVLC = value;
            OnPropertyChanged("LibVLC");
        }
    }

    /// <summary>
    /// Gets the <see cref="LibVLCSharp.Shared.MediaPlayer"/> instance.
    /// </summary>
    public MediaPlayer _MediaPlayer;
    public MediaPlayer MediaPlayer
    {
        get
        {
            return _MediaPlayer;
        }
        set
        {
            _MediaPlayer = value;
            OnPropertyChanged("MediaPlayer");
        }
    }
}

Answer 1

我已经检查了存储在Resource的Assets文件夹中的MP4的路径。它总是会引发如下异常。

VLC is unable to open the MRL

您可以将mp4文件放在Assets文件夹中，然后复制到设备上进行播放。

LibVLCSharp.Platforms.Android.VideoView _videoView;
    LibVLC _libVLC;
    MediaPlayer _mediaPlayer;
    private const string fileName = "BigBuckBunny.mp4";
    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        Xamarin.Essentials.Platform.Init(this, savedInstanceState);
        // Set our view from the "main" layout resource
        SetContentView(Resource.Layout.layout1);
    }

    protected async override void OnResume()
    {
        base.OnResume();

        Core.Initialize();

        _libVLC = new LibVLC();
        _mediaPlayer = new MediaPlayer(_libVLC)
        {
            EnableHardwareDecoding = true
        };

        //_videoView = new LibVLCSharp.Platforms.Android.VideoView(this) { MediaPlayer = _mediaPlayer };

        _videoView = FindViewById<LibVLCSharp.Platforms.Android.VideoView>(Resource.Id.videoPlayer);
        _videoView.MediaPlayer = _mediaPlayer;

        // Android application default folder.
        var dbFile = GetDefaultFolderPath();

        // Check if the file already exists.
        if (!File.Exists(dbFile))
        {
            using (FileStream writeStream = new FileStream(dbFile, FileMode.OpenOrCreate, FileAccess.Write))
            {
                // Assets is comming from the current context.
                await Assets.Open(fileName).CopyToAsync(writeStream);
            }
        }


        //AddContentView(_videoView, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WrapContent, ViewGroup.LayoutParams.WrapContent));
        var media = new Media(_libVLC, dbFile, FromType.FromPath);//"http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"
        if (File.Exists(dbFile))
        {
            _videoView.MediaPlayer.Play(media);
        }


    }
    private string GetDefaultFolderPath()
    {
        var appFolder = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
        var dbFile = Path.Combine(appFolder, fileName);

        return dbFile;
    }