iOS 和字节范围视频流不工作

Question

目前有一种情况，iOS (10.2.1) 不想在 HTML 视频元素中请求具有字节范围的视频 - 它想在开始播放之前下载整个视频。对于大型视频文件和 4G 连接来说，这自然是荒谬的 - 有人遇到过这个问题吗？

使用 Web API 2 流式传输内容 -

            string mapped = HostingEnvironment.MapPath(vmApplication.Instance.VideoPath);
            string filename = Path.Combine(mapped, name);
            string ext = System.IO.Path.GetExtension(filename)?.ToLower().Trim('.');
            string contentType = MimeMapping.GetMimeMapping(filename);
            switch (ext)
            {
                case "webm": contentType = "video/webm"; break;
                case "mp4": contentType = "video/mp4"; break;
                case "ogg": contentType = "video/ogg"; break;
            }
            MediaTypeHeaderValue _mediaType = MediaTypeHeaderValue.Parse(contentType);


            FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);
            if (Request.Headers.Range == null)
            {
                Request.Headers.Range = new RangeHeaderValue(0, null);
            }
            try
            {

                HttpResponseMessage partialResponse = Request.CreateResponse(HttpStatusCode.PartialContent);
                ByteRangeStreamContent content = new ByteRangeStreamContent(fs, Request.Headers.Range, _mediaType, VIDEOBUFFER);
                partialResponse.Content = content;
                return partialResponse;
            }
            catch (InvalidByteRangeException invalidByteRangeException)
            {
                return Request.CreateErrorResponse(invalidByteRangeException);
            }

HTML 元素非常基础，使用 videojs

    <video id="video-1" controls preload="none" data-setup='{ "fluid": true }' poster="@Url.Content("~/Content/images/poster/video-1.jpeg")" class="video-js vjs-default-skin vjs-big-play-centered">
        <source src="@Url.RouteUrl("DefaultApi",new {httproute = "", id = "File", controller = "Video", name = "video-1.webm" })" type='video/webm' />
        <source src="@Url.RouteUrl("DefaultApi",new {httproute = "", id = "File", controller = "Video", name = "video-1.mp4" })" type='video/mp4' />
        <source src="@Url.RouteUrl("DefaultApi",new {httproute = "", id = "File", controller = "Video", name = "video-1.ogg" })" type='video/ogg' />
        <p class="vjs-no-js">
            To view this video please enable JavaScript, and consider upgrading to a web browser that
            <a href="http://videojs.com/html5-video-support/" target="_blank">supports HTML5 video</a>
        </p>
    </video>

一点运气都没有，任何帮助将不胜感激

Answer 1

FFmpeg 有一个选项 (-movflags +faststart) 可以预渲染视频文件并在加载时播放。检查您的转换器是否有类似的选项。

你可以尝试 preload="auto"或 preload="metadata"

此外，检查 http 请求和响应 header 是否包含 Range 参数。如果请求有但响应没有，则表示 IIS 的字节范围设置错误。

希望对您有所帮助。