在asp.net core 2中流式传输视频文件

Question

我想使用 asp.net core 在浏览器中播放视频

在html中我有

<video width="320" height="240" controls>
 <source src="http://localhost:55193/api/VideoPlayer/Download" type="video/mp4">
 Your browser does not support the video tag.
</video>

并在asp.net core 2中

    [HttpGet]
    [Route("Download")]
    public async Task<IActionResult> Download()
    {
        var path = @"d:\test\somemovie.mp4";
        var memory = new MemoryStream();
        using (var stream = new FileStream(@"d:\test\somemovie.mp4", FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 65536, FileOptions.Asynchronous | FileOptions.SequentialScan))
        {
            await stream.CopyToAsync(memory);
        }
        memory.Position = 0;
        return File(memory, "application/octet-stream", Path.GetFileName(path));
    }

此代码是否通过流播放文件（我的意思是逐块缓冲文件并播放）？

如果我想从用户设置播放器进度的任何位置播放文件，我该怎么做？

Answer 1

这里只使用普通的return PhysicalFile：

public class HomeController : Controller
    {
        public IActionResult Download()
        {
            return PhysicalFile(@"d:\test\somemovie.mp4", "application/octet-stream");
        }

因为它支持流式传输和恢复文件下载所必需的范围标头：

还有return File，FileStreamResult也VirtualFileResult支持partial range requests一下。甚至static files middleware也支持这一点。