Windows 8 应用程序 - MediaElement 不播放“.wmv"文件 [英] Windows 8 app - MediaElement not playing ".wmv" files

问题描述

我的 Win8 应用程序中的 MediaElement 存在问题 - 当我尝试从本地库播放一些.wmv"文件时，它经常(并非总是)抛出 MediaFailed 我得到了错误

I have an issue with MediaElement in my Win8 app - when I try to play some ".wmv" files from local library it very often (not always) throws MediaFailed and I get the error

MF_MEDIA_ENGINE_ERR_SRC_NOT_SUPPORTED:HRESULT - 0xC00D36C4

MF_MEDIA_ENGINE_ERR_SRC_NOT_SUPPORTED : HRESULT - 0xC00D36C4

意思是

视频编解码器或音频编解码器不受支持，或者其中之一视频文件中的流已损坏.此内容可能不是支持.

Either the video codec or the audio codec is unsupported, or one of the streams in a video file is corrupted. This content may not be supported.

问题是不是文件已损坏(我可以使用 Windows Media Player 播放它们).这是我用来设置 MediaElement 的代码:

The problem is not that files are corrupted (I can play them with Windows Media Player). Here's the code I use to set MediaElement:

private async void Button_Click(object sender, RoutedEventArgs e)
{
    var picker = new FileOpenPicker();
    picker.FileTypeFilter.Add(".wmv");
    picker.FileTypeFilter.Add(".mp4");
    picker.SuggestedStartLocation = PickerLocationId.VideosLibrary;
    StorageFile file = await picker.PickSingleFileAsync();
    if (file != null)
    {
        using (IRandomAccessStream ras = await file.OpenAsync(FileAccessMode.Read))
        {
            me.SetSource(ras, file.ContentType);
        }
    }
}

有人知道这里出了什么问题吗?提前致谢.

Does anybody know what's wrong here? Thanks in advance.

推荐答案

问题可能是您在播放之前关闭了流.因此这段代码:

The problem is likely that you are closing the stream prior to playing it. Therefore this code:

if (file != null)
{
    using (IRandomAccessStream ras = await file.OpenAsync(FileAccessMode.Read))
    {
        me.SetSource(ras, file.ContentType);
    }
    // The stream is now closed! How can it be played!?
}

应该改为没有 using 块:

if (file != null)
{
    IRandomAccessStream ras = await file.OpenAsync(FileAccessMode.Read);
    me.SetSource(ras, file.ContentType);
}

我确实在一些 9 频道视频(中质量和高质量 wmv 文件)上尝试了上面的第二个代码块，并且我的应用成功地播放了它们.

I did try the second block of code above on some channel 9 videos (both mid and high quality wmv files) and my app played them successfully.

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