[Windows10]如何从HLS视频流中获取定时文本 [英] [Windows10] How to get timed text from HLS video stream

问题描述

大家好

我正在为Windows 10开发一种媒体播放器。

I’m developing a sort of Media Player for Windows 10.

此播放器包含两个轨道：一个用于视频，另一个用于音频。这两个流分别作为HLS跟踪并使用H264和AAC编解码器。

This player consists in two tracks: one for video and the other for audio. These two streams come as HLS tracks and use H264 and AAC codecs, respectively.

我实现此应用程序的方式是使用AdaptiveMediaSource类来保存HLS轨道，使用MediaElement类来打印其内容。这两个对象都有ID3v2形状的定时文本元数据，它们嵌入在HLS实时流
中，我必须以某种方式检索它们。

The way I have implemented this application is using the AdaptiveMediaSource class for holding the HLS tracks and the MediaElement class for printing their content. Both objects have ID3v2-shaped timed-text metadata, which are embedded in the HLS live stream and I must retrieve them somehow.

寻找获取它们的方法，我找到了TimelineMarker类，它应该从MediaElement接收元数据，但事实是当抛出事件时（MediaElement.MarkerReached）我我没有取回任何东西。

Looking for a way to get them, I found the TimelineMarker class, which is supposed to recieve metadata from MediaElement, but the fact is that when the event is thrown (MediaElement.MarkerReached) I’m not retrieving anything.

所以，我需要一种听众，当嵌入的标签被解码或回放点达到与标签相关的时间时通知我。

So, I need a kind of listener that notifies me when the tags embedded are decoded or when the playback point reaches the time associated with the tag.

我怎样才能获得这些标签？

How could I get those tags?

提前致谢

推荐答案

呵呵。

这是我严密保密的秘密之一

This is one of my closely guarded secrets

你显然需要一个特殊的课程来保存你需要的信息。你还需要一个计时器。 m3u（8）文件也以特定方式（行）格式化。

You obviously need a special class to hold the information you need. You also need a timer. An m3u(8) file is also formatted in a specific way (lines).

我认为你可以安全地从这里继续：）

I think you can safely continue from here :)

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