在 ASP.NET Core 中流式传输时如何设置持续时间视频？

Question

在 ASP.NET Core 中流式传输视频时遇到问题

我的视频时长：1:04 当我流式传输此视频时，我想向用户显示 26 秒（40% - 视频长度）

using (var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 65536, FileOptions.Asynchronous | FileOptions.SequentialScan))
            {
                int totalSize = (int)(fileStream.Length*0.4);
                //here we are saying read bytes from file as long as total size of file 

                //is greater then 0
                while (totalSize > 0)
                {
                    int count = totalSize > bufferSize ? bufferSize : totalSize;
                    //here we are reading the buffer from orginal file  
                    int sizeOfReadedBuffer = fileStream.Read(buffer, 0, count);
                    //here we are writing the readed buffer to output//  
                    await outputStream.WriteAsync(buffer, 0, sizeOfReadedBuffer);
                    //and finally after writing to output stream decrementing it to total size of file.  
                    totalSize -= sizeOfReadedBuffer;
                }
                //outputStream.Position = 0;
            }

outputstream 通过 Response.Body 返回流

var stream = context.HttpContext.Response.Body;

但是当响应 html video 标签时，它总是显示持续时间 1:04。我想将此视频的持续时间设置为 26 秒 (40%)

请帮帮我！！！

Answer 1

改用此解决方案，这将流式传输 40% 的视频/音频：

API 控制器：

[ApiController]
[Route("api/[controller]")]
public class StreamerController : ControllerBase
{
    const string Filename = @"C:\PathToYourAudio\Stream.mp3";

    [HttpGet("Stream")]
    public IActionResult Stream()
    {
        byte[] fileData;

        using (FileStream fs = System.IO.File.OpenRead(Filename))
        {
            using (BinaryReader binaryReader = new BinaryReader(fs))
            {
                fileData = binaryReader.ReadBytes((int)(fs.Length * 0.4));
            }
        }

        MemoryStream stream = new MemoryStream(fileData);
        return new FileStreamResult(stream, new MediaTypeHeaderValue("audio/mpeg").MediaType);
    }
}

查看：

<audio controls="controls" autoplay="autoplay">
    <source src="/api/Streamer/Stream" type="audio/mpeg">
</audio>

Sample Code