Zeromq 是点对点视频聊天的正确解决方案吗
我想知道我的zeromq想法是否正确？我正在考虑使用 Zeromq 编写一个点对点聊天应用程序，但当我进一步阅读它时，Zeromq 似乎比使用的（tcp 套接字）更低级别。 Zeromq 适合编写点对点聊天应用程序吗？或者这个用例不适用？
I was wondering if my idea of zeromq is right? I was thinking of writing a peer to peer chat application using zeromq but as i read further into it zeromq seems to be more low level than what one would use (tcp sockets). Is zeromq good for writing peer to peer chat app or is this use case not applicable?
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首先，我不同意您的说法，即 Zeromq 比套接字更低级。 AFAICT Zeromq 提供了一个类似于套接字 API 的 API。然而，它还可以处理其他事情，例如使用相同的发送调用向多个客户端发送消息。
其次，你的问题不是很清楚：你所说的“好”是什么意思：易于编写（因为你指的是低级）、可靠、足够高效等？您可以使用任何您想要的东西，实现的复杂程度当然会有所不同。
另外，您可能应该在视频聊天应用程序中使用 udp 而不是 tcp，因为数据及时到达比所有数据到达更重要，但这是一个完全不同的主题。如果您可以将 Zeromq 与 udp 结合使用（并且您必须对此进行研究），我认为您没有理由不能将其用于视频聊天。
您需要考虑的主要因素是您是否可以足够快地在对等点之间发送数据，以便提供可接受的 QoS：AFAIR 对于会话服务来说，大约 300 毫秒的最大 RTT 被认为是可以的。
以下链接适用于 VOIP，但也应适用于视频聊天要求：
Firstly, I would disagree with your statement that zeromq is more low-level than sockets. AFAICT zeromq presents an API that is similar to the socket API. However it can also handle other things such as sending messages to multiple clients with the same send call.
Secondly, your question is not very clear: what do you mean by good: Easy to write ( since you refer to low-level), reliable, efficient enough, etc? You can use anything you want, the level of implementation complexity will of course differ.
Also, you should probably use udp instead of tcp in a video chat application, since it is more important that data arrives timeously than that all data arrives, but that is a whole different topic. If you can use zeromq with udp (and you'll have to research that), I see no reason why you couldn't use it for video chat.
The main factor you need to consider is whether you can send data between the peers fast enough in order to provide an acceptable QoS: AFAIR a maximum RTT of around 300ms is perceived as ok for conversational services.
The following link applies to VOIP but should also apply to video chat reqirements:
正如 Ralf 指出的那样，ZeroMQ 是非常高级的，而不是低级的。此外，通常建议不要将 ZeroMQ 用于视频，因为 UDP 支持是新的且尚未通用（请参阅此答案 ）。一般来说，ZeroMQ 是围绕使用 TCP 套接字构建的，尽管 PUB/SUB 架构模仿 UDP，但您不会获得真正的 UDP 性能（这对视频至关重要），因为 TCP 套接字上的错误检查使得很难获得延迟足够低以获得流畅的视频流。
As Ralf points out, ZeroMQ is very high-level, not low-level. Furthermore, generally one would be advised against using ZeroMQ for video simply because UDP support is new and not yet universal (see this answer). Generally, ZeroMQ was built around using TCP sockets, and although the PUB/SUB architecture mimics UDP, you won't get real UDP performance (which is crucial for video) because the error-checking on TCP sockets makes it hard to get the latency low enough to get a smooth video stream.