我是AvaloniaUI 0.10.5的新手。目前我正在macOS上的一个应用程序中使用VideoView控件（LibVLCSharp. Avalonia 3.5.0）。代码是Donadren示例2的副本：（https://github.com/donandren/vlcsharpavalonia/tree/master/samples/LibVLCSharp.Avalonia.Sample）中的一个。
视频播放器在窗口控件中运行良好，但当我将代码复制到UserControl中（以便在应用程序的其他位置重用播放器）时，我听到了视频的声音，但没有图像。在控制台中，我遇到了以下错误：

[h264 @ 0x7ff85e8d3600] get_buffer () failed
[h264 @ 0x7ff85e8d3600] thread_get_buffer () failed
[h264 @ 0x7ff85e8d3600] decode_slice_header error
[h264 @ 0x7ff85e8d3600] no frame!

我试着在网上搜索，但什么也找不到。
你能帮助我吗，谢谢，对不起，我的英语不好。

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:viewModels="clr-namespace:Avalonia.NETCoreMVVMApp3.ViewModels"
             xmlns:avalonia="clr-namespace:LibVLCSharp.Avalonia;assembly=LibVLCSharp.Avalonia"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="Avalonia.NETCoreMVVMApp3.Views.VlcControl">
    <Design.DataContext>
        <viewModels:VlcControlViewModel/>
    </Design.DataContext>
    <Grid RowDefinitions="*, Auto">
      <avalonia:VideoView x:Name="VideoView" Grid.Row="0" MediaPlayer="{Binding MediaPlayer}">
      </avalonia:VideoView>
      <Grid Grid.Row="1" RowDefinitions="Auto,Auto,Auto">
        <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto">
          <TextBlock Text="File (url):" Grid.Column="0" VerticalAlignment="Center" />
          <AutoCompleteBox Name="mediaUrl" Text="{Binding MediaUrl, Mode=TwoWay}" Items="{Binding Played}" FilterMode="Contains" Grid.Column="1" IsDropDownOpen="False" />
          <Button Content="Open File" Command="{Binding OpenCommand}" Grid.Column="2" />
        </Grid>
        <Grid Grid.Row="1" ColumnDefinitions="Auto,*,Auto">
          <TextBlock Text="{Binding CurrentTime}" Grid.Column="0" />
          <TextBlock Text="{Binding Duration}" Grid.Column="2" />
          <Slider Minimum="0" Maximum="100" Value="{Binding Position}" Grid.Column="1" />
        </Grid>
        <Grid Grid.Row="2" ColumnDefinitions="Auto, *,Auto">
          <StackPanel Orientation="Horizontal" Grid.Column="0" Spacing="5">
            <Button Content="Play" Command="{Binding PlayCommand}" />
            <Button Content="Stop" Command="{Binding StopCommand}" />
            <Button Content="Pause" Command="{Binding PauseCommand}" />
            <Button Content="-1s" Command="{Binding BackwardCommand}" />
            <Button Content="+1s" Command="{Binding ForwardCommand}" />
            <Button Content="Next Frame" Command="{Binding NextFrameCommand}" />
          </StackPanel>

          <Grid ColumnDefinitions="Auto,*" Grid.Column="1">
            <TextBlock Text="{Binding State, StringFormat='State:\{0\}'}" Grid.Column="0" VerticalAlignment="Center" />
            <ScrollViewer Grid.Column="1" MaxHeight="40" HorizontalScrollBarVisibility="Disabled">
              <TextBlock Margin="5,0,0,0" Text="{Binding Information}" TextWrapping="Wrap" VerticalAlignment="Center" />
            </ScrollViewer>
          </Grid>

          <StackPanel Orientation="Horizontal" Grid.Column="2" Spacing="2">
            <StackPanel Orientation="Horizontal">
              <TextBlock Text="Rendering:" VerticalAlignment="Center" />
              <ComboBox SelectedIndex="{Binding #VideoView.VlcRenderingOptions}">
                <ComboBoxItem Content="{x:Static avalonia:LibVLCAvaloniaRenderingOptions.VlcNative}" />
                <ComboBoxItem Content="{x:Static avalonia:LibVLCAvaloniaRenderingOptions.Avalonia}" />
                <ComboBoxItem Content="{x:Static avalonia:LibVLCAvaloniaRenderingOptions.AvaloniaCustomDrawingOperation}" />
              </ComboBox>
            </StackPanel>
            <CheckBox Content="Stats" IsChecked="{Binding #VideoView.DisplayRenderStats}" />
            <CheckBox Content="Volume:" IsChecked="{Binding !IsMuted, Mode=TwoWay}" />
            <Slider IsEnabled="{Binding !IsMuted}" Minimum="0" Maximum="100" Width="200" Value="{Binding Volume}" VerticalAlignment="Center">
              <Slider.Styles>
                <Style Selector="Slider:disabled">
                  <Setter Property="Opacity" Value="0.5" />
                </Style>
              </Slider.Styles>
            </Slider>
          </StackPanel>
        </Grid>
      </Grid>
  </Grid>
</UserControl>