Windows 8应用 - 的MediaElement不玩" .WMV"档 [英] Windows 8 app - MediaElement not playing ".wmv" files

问题描述

我有的MediaElement 的一个问题在我的Win8应用程序 - 当我试图从它经常（并不总是）引发当地图书馆玩一些.WMV文件的MediaFailed 和我得到的错误

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

这意味着

无论是视频编解码器或音频编解码器是不支持的，或
在视频文件中的流中的一个已损坏。此内容可能不支持

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.

问题是的不的那个文件被损坏（我可以用Windows Media Player播放他们）。下面是我用来设置的MediaElement 中的代码：

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);
        }
    }
}

有谁知道什么是错在这里？先谢谢了。

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

推荐答案

这个问题可能是你在玩它之前关闭流。因此，此代码：（！文件= NULL）

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!?
}

应该改为使用块：

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

我曾尝试上面的一些频道9视频代码的第二块（包括中，高品质的WMV文件）和我的应用程序发挥他们的成功。

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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