I am planning a project CCTV system using Node.js and openCV, WebGL.
Would you please take a look at my plan and find flaw or give me advice?
My plan is: Entire system consists of 3 types of host, CCTV-server-watchmen. Numbers of each host may be (more than 10)-1-3? CCTV take a video and send it to the server. The server identifies persons in the video, and analyzes who this person is and where he or she is(using OpenCV). Finally, watchmen can seize entire status of field he or she manages(map drawn by webGL helps it). I will use node.js as network method.
I have a few issues about my plan.
Is it efficient to use Node.js as video data transmitter?
Basic concept of Node.js is single-thread, so maybe large data like video does not fit to it. But, count of CCTV and watchmen is limited and fixed(It is system for closed intranet)
Is there any method can replace Node.js?
I will not replace openCV and WebGL. But Node.js could matters. At the beginning of planning, I was finding other means for networking between C/C++ program and web-browser. Honestly, I got failed at school-project last year. One of problems that I can't find solution was "How to send/receive data between C program installed at Raspberry Pi and web Browser". I chose Node.js as method this project, but also heard other means of Qt, DB, CGI. Is there a better way?
Thank you for reading it.
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Hello, I am looking for a way to forward my live stream from my server to another server, for example, Facebook via rtmp.
the structure would be something like:
My cam -> my server -> other server rtmp -> viewers
My intention is to capture the transmission and forward it to many rtmp servers to consume the server's resources and not the client's resources, I don't have much knowledge in video transmissions, if it is possible to do it via nodejs it would be great, thanks
I have searched for SFU and other ways that are possible, but I want to have several alternatives and find the most ideal to implement it in production
I never did it myself, so I can't recommend the best way to do it.
After some research, if you want to stay with nodejs, I personallly recommend Mediasoup.
It is a powerfull SFU developed in c++ which provided really good bindings with nodejs. All the heavy process is done in c++ and the nodejs API call a child process where the c++ mediasoup worker runs on it. You only have to care about the nodejs API nothing else.
With mediasoup it should not be too difficult to get your stream on the nodejs server.
After that, for transmitting you stream to a rtmp server, it seems you can call ffmpeg in a child process to transfer it from your nodejs server to a rtmp server.
I found two github projects with this kind of approach.
The first one is a bit outdated, using an old mediasoup version but maybe you can find something interesting. Specially for the client/browser part, you have an HTML file that should be helpfull. Be aware the API for Mediasoup may have changed, both the front and the back.
EDIT : The first project does not use Mediasoup client library, you can look at it here
The second is more recent and really seems to match your need, maybe you will need some cutomization. But they don't provide any front end part.
For mediasoup, you will find a lot of ressources over the internet, github, youtube for the client/server part.
If you want to look at it, the installation guide for the Mediasoup v3 (last) version. You have to install a python specific version and set few environment variables. After that you can install the npm package and happy coding !
It is easier to install on linux, so if you are on windows, preferably use WSL2 for testing. I don't know anything about Mac, but I know docker is possible, so should be good too.
A lot simpler option to stream your webcam to other servers will be to use OBS studio, but you must have already considered it
They have a plug in that permits to send your stream to multiple platform at once, looks really cool ! Here
Hope it can give you some more options !
I am trying to create a digital vehicle gauge cluster. I am using a RasPi to gather speed, RPM, and engine temperature and am currently using NodeJS to pull sensor data from the GPIO pins.
My initial plan was to take advantage of my preexisting HTML/CSS skills to then display this data to the driver and update that local HTML site using getElementById() tags in my JS and write over the data values. However, when I launched my site I realized that Node wasn't being used since I hadn't actually asked Node to start interpreting anything.
Given that I already have this website GUI built and the JS done to write to it, is there a way for me to actually connect these two scripts? Is there a way for me to use Node to launch the website and initialize Node at the same time?
Hope this isn't a duplicate question or covered in documentation somewhere.
Thanks in advance for any tips.
I need to write own video hosting with player on client side.
My required approaches:
The user can upload video to hosting
The user can watch any video from hosting
I don't ask to write me solution, I am asking for help where should I start from to lean about it? Which technologies or frameworks should I learn for my task to realize it using python?
P.S. Each detail will be very useful, especially some links to articles because I couldn't find by myself not knowing accurately what do I need to search.
Added
Now, I think to store videos in the file system directly and use postgresql to store additional information about videos and users. Of course, large services use Hadoop, BigTable and etc but for my task so solution will be enough I think.
When the user uploaded a new video, my server saves it into a temporary directory and puts in the processing queue. Small programs takes new videos one by one, generates thumbnails and decrease a quality of videos and moves it to the base storage. Is it a good idea?
But I still can't get how make a video streaming
Ok So I dont want to encourage the behavior of people thinking SO is a codewriting service, But this is a truly legitimate answer. So first of all, you want to choose a language. Currently I'd recommend the use of javascript and Node.js (Java needs to die). However, IDK Node as well as I know Python. Python is an all purpose language yadda yadda yadda blah blah blah. Whats important in this case is your framework of choice (or library). The libraries that allow you to make websites in python (or make it easier to do so) are very interesting. There are several but my favorite is Python Flask. Python flask is actually very similar to Node.js + Express.js. Use this link to get started. Take a few days to learn the insides of this framework. VERY MODULAR, VERY POWERFUL. Using basing logic and database knowledge, one can easily accomplish a simple file upload and authentication-using, web service. However I Know of 2 really good guides that will help you with the streaming of the videos. I mean yes, You don't really need to know this. You could potentially load the requested video using a <video> tag, but streaming is a much MUCH
more favorable solution. Take some time to learn about video streaming and compression, and after you think about it, check out these links: AUDIO STREAMING GIST and MIGUEL GRINBERG FLASK VIDEO STREAMING BLOG POST
Good luck with flask and
Pro tip: learn about http(s) and the get and post methods
You would never imagine how many times I struggled with a bad request error or a method not allowed because I didn't do my research
I have a telephony scenario in which the following happens:
Customer calls a Voice Gateway
TCL script runs and a code is taken from customer
Authentication is done through a RADIUS server
Customer will hear correct voice menu
The problem is that RADIUS server must connect to a SQL Database and check the credentials. I have currently designed the solution using cisco secure ACS and through managed stored procedures on MS SQL server.
My question is: Is the VoiceXML a better tool to do this job and because some extenstions and wrappers of VoiceXML exists in .net, does it fit in this simple scenario??
Sincerely speaking, I am a little confisued with the technology and looking for a good tutorial on its features as well.
Thanks
In a strict sense, only step 4 is implemented by VoiceXML. Other aspects are handled by the platform or external code. VoiceXML is the standards mechanism for implementing step 4, but if all you are going to do is limited audio output and simple input, it may be overkill depending on the solutions available to you.
The following is just an example of a way to solve your problem and is fairly fictitious given I don't know anything about your environment nor constraints.
Given most VoiceXML platforms, upon receiving of a call your VoiceXML application will be executed. If this is a servlet/ASP based solution, you can perform steps 2 & 3 then generate/return the VoiceXML to play the menu, gather the input and move to the next step. If this is a static VoiceXML 2.1 solution, you can use a Data element call to make an HTTP request to a system that can perform these actions. The system will need to return XML that the Javascript/ECMAScript in VoiceXML application can parse and provide the correct audio output and input processing.
Since you are asking about VoiceXML, I'm assuming your challenge is the telephony aspect of the problem. Unless you have a system already available, choosing and activating a premise or hosted solution is far more complicated than the call flow code involved. Depending on your requirements, there are solutions as low as a single line, analog modem that supports audio output and DTMF input to massively scaled on premise and hosted solutions to handle 10,000s of concurrent calls that implement VoiceXML as well as a wide range of other call flow technologies.
VoiceXML would work fine in this scenario. There is a an open source project called VoiceModel that uses ASP.NET MVC to generate the VoiceXML and therefore integrates nicely with the .NET stack. There are a lot of examples in the project with discussions on how to use the examples in this blog. The examples use Voxeo Prophecy as the VoiceXML platform which has a SIP interface that will connect with a Voice Gateway. You can download two ports for free to try it out.
We have an embedded box. The specs of the CPU is medium speed (600MHz) and RAM is between 512MB to 2GB depending on configuration. The system consists of data layer to process incoming data from hardware and needing to be displayed both remotely and on an HDMI output.
Seeing the remote aspect is as important as the local display, we have architected a client-server solution. For the server, it just needs to respond to requests for data. The data needs to come from the internals of another process (IPC interaction) and return it formatted for the client.
For the server we are thinking of using node.js. The data is spec'ed to be formatted into json messages, so using JavaScript and json is simple.
However, are there any better/other server options to consider?
The main requirement is the server can be extended to interact with the data process and be able to process and respond to requests.
We could write it ourselves, but feel that there must be usable tech to leverage already.
Thanks.
I am assuming that you need output as a webpage only.
It depends.
If your team knows java/servlet well, you can do using simple jetty/servlet/jsp combination.
But if you have team good with javascript/node.js, go with it. Although, I am not sure about stability requirements you have, because node.js is quite stable but it haven't reached 1.0 yet.