UWP使用特定宽高创建视频编码时MediaStreamSource.SampleRequested事件未触发

问题根因 #

你遇到的0xC00D5212错误是Media Foundation管线初始化失败导致的，系统无法为非标准宽高的IYUV/I420格式找到可用的颜色转换或渲染组件，核心触发点如下：

1. I420(IYUV)属于YUV4:2:0采样格式，UV分量宽高均为Y分量的1/2，要求视频帧宽高必须为偶数，你报错场景的1037为奇数高度，不符合格式规范
2. 缺失必填的编码参数校验也可能导致管线初始化中断

解决思路 #

• 强制对齐视频帧宽高：在送入MediaStreamSource前，先对原始帧做裁剪或补边操作，将宽高都调整为2的倍数，高分辨率场景可调整为4/16对齐适配硬件解码要求
• 补全编码属性配置：取消代码中Bitrate属性的注释，按I420 12bpp的规则正确赋值，避免参数校验失败
• 兼容格式声明：如果对齐后仍有异常，可给VideoStreamDescriptor额外添加NV12、RGB32等系统支持度更高的格式声明，管线会自动匹配可用转换路径
• 排查第三方组件冲突：如果安装过第三方解码滤镜，可通过MFTRACE工具排查管线初始化阶段的模块加载日志，确认是否是自定义组件覆盖了内置YUV转换模块

修正后代码示例 #

private MediaStreamSource CreateI420VideoStreamSource(uint originalWidth, uint originalHeight,int framerate)
{
    // 先将宽高对齐为2的倍数
    uint width = originalWidth % 2 == 0 ? originalWidth : originalWidth + 1;
    uint height = originalHeight % 2 == 0 ? originalHeight : originalHeight + 1;
    
    if (width == 0)
    {
        throw new ArgumentException("Invalid zero width for video.", "width");
    }
    if (height == 0)
    {
        throw new ArgumentException("Invalid zero height for video.", "height");
    }
    var videoProperties = VideoEncodingProperties.CreateUncompressed(MediaEncodingSubtypes.Iyuv, width, height);            
    var videoStreamDesc = new Windows.Media.Core.VideoStreamDescriptor(videoProperties);
    videoStreamDesc.EncodingProperties.FrameRate.Numerator = (uint)framerate;
    videoStreamDesc.EncodingProperties.FrameRate.Denominator = 1;
    videoStreamDesc.EncodingProperties.Height = height;
    videoStreamDesc.EncodingProperties.Width = width;
    // 补全Bitrate参数
    videoStreamDesc.EncodingProperties.Bitrate = ((uint)framerate * width * height * 12);
    var videoStreamSource = new Windows.Media.Core.MediaStreamSource(videoStreamDesc);
    videoStreamSource.BufferTime = TimeSpan.Zero;
    videoStreamSource.SampleRequested += OnMediaStreamSourceRequested;
    videoStreamSource.IsLive = true;
    videoStreamSource.CanSeek = false;
    return videoStreamSource;
}

内容的提问来源于stack exchange，提问作者Karthik