来自OpenCVSharp捕获的ASP.NET Core流视频 [英] ASP.NET Core stream video from the OpenCVSharp capture

问题描述

我想使用ASP.NET Core应用程序流式传输从网络摄像头捕获的视频. 我还需要对框架进行一些操作，这就是为什么我使用OpenCVSharp.

I want to stream video captured from the webcam using ASP.NET Core application. I also need to do some manipulations with the frames, that's why I'm using OpenCVSharp.

目前我有下一个发展:

我认为
• html-在这里我不知道应该使用哪种类型

<video id="video" preload="auto">
  <source src="LiveVideo" type="<< don't know the type >>"/>
</video>

• 我的控制器-这里我也不知道内容类型和主要问题:我不知道如何流传输OpenCVSharp捕获的视频

[ApiController]
[Route("[controller]")]
public class LiveVideoController : ControllerBase 
{
  [HttpGet]
  public async Task<FileStreamResult> GetVideo()
  {
    // capture frames from webcam
    // https://github.com/shimat/opencvsharp/wiki/Capturing-Video
    var capture = new VideoCapture(0);

    var stream = await << somehow get the stream >>;

    return new FileStreamResult(stream, << don't know the content type >>);
  }
}

推荐答案

如果某人需要该应用程序如此奇特的行为，我已经找到了一种方法. Blazor是可能的.我像读取字节数组一样读取每个帧，并将其发送到UI并将其转换为图像.

If somebody needs so exotic behavior for the app, I've found a way. It is possible with Blazor. I read each frame like a bytes array and send it to the UI and convert it to the image.

这是我的Blazor组件 LiveVideo.razor

Here is my Blazor component LiveVideo.razor

@page "/live-video"

@using OpenCvSharp;


<img src="@_imgSrc" />


@code {
    private string _imgSrc;

    protected override async Task OnInitializedAsync()
    {
        using (var capture = new VideoCapture(0))
        using (var frame = new Mat())
        {
            while (true)
            {
                capture.Read(frame);

                var base64 = Convert.ToBase64String(frame.ToBytes());
                _imgSrc = $"data:image/gif;base64,{base64}";

                await Task.Delay(1);

                StateHasChanged();
            }
        }
    }
}

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