I am a beginner with Windows Azure and I want to make an app which does facial recognition on a video stream. Hence I need to install OpenCV (C++ Library).
How do I do that? And how do I get the video stream from the client app? (I am in control of the client app as well).
If the library simply needs to be on the path for your application to pick it up, then just add it as an item in the project you're deploying, and it will get uploaded up to Azure, and deployed alongside your application.
If some commands are required to install it, you can use startup tasks.
As for the video stream, you can open a socket (using a TCP endpoint) and stream the video up to an azure instance that way. That's probably the most efficient way of doing it if you want real time video processing. If you want to record the video and upload it, look at using blob storage. You can then use a message queue to signal to the worker, that there is a video waiting to be processed.
Related
I am trying out VOD streaming with latest VLC as described in this wiki:
https://wiki.videolan.org/Documentation:Streaming_HowTo/VLM/ and trying to stream an HD movie file with extension mp4.
i am able to open the stream in VLC running on the same machine, but it takes lot of time to even start playing back. (minutes). The test is run in Fedora 20.
My machine is capable enough to play HD video.
I have tried with and with trans-coding and results are same.
Help is appreciated.
Found the issue and it is strange.
I had the streaming server and client in the same machine. The streaming was always extremely slow. However, disconnecting from the network made it work fast.. It did not matter whether the network connection was wifi or ethernet.
However, if you were to run the client in a different machine, it work properly.
I'm looking to find a way to stream a user's desktop LIVE (through some piece of software, such as Open Broadcaster Software) to a web application.
I'm assuming I should use a CDN to get the live streamed video to my web application, but how (and what software should I use) to get the user's desktop to a streaming service? Should I use a service such as Red5 or an AWS service? Or if only a few viewers are using it, should I host the service myself?
Although I have built my share of web applications, I have never dealt with live media streaming before, and I would appreciate any assistance anyone could lend.
By far the best resource for video on Rails is OpenTok
Our own demo here: http://bvc-video.herokuapp.com/broadcasts/1
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Streaming
Video streaming is a tough one
The problem is really dependent on what you're trying to stream. If it's "live" video - I.E captured & sent directly to the viewers, you'll have to use some sort of server to process the video.
Although I don't have huge experience with this, the main issue we've found is the compression / distribution of the feed. It's actually very simple to acheive video streaming on iOS - all the software / hardware is the same (just use the same API / drivers)
This often negates the requirement for a central server, although it's highly recommended (almost required) for many cases. Problems arise when you try and beam to multiple clients on multiple systems; as you'll run into compatibility issues
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Solutions
The solutions we've found are thus:
The most stable part of the app is to take the stream & send to a server
The wizardry will then be to beam that stream to multiple clients
The way to do this is typically to use a flash widget & pull the stream from the server
WebRTC is becoming the standard (OpenTok is built on this)
I'm not sure about video compression / distribution. Akami is an industry heavyweight, but I've never used it. Brightcove too
I'm trying to figure out if it's possible to stream directly from a webcam (IP Camera / Network Camera) to an RTMP Flash Server.
The purpose is to be able to set up a camera at a location and be able to stream directly from it to streaming services such as DaCast or justin.tv without the need to have it hooked up to a computer that does the encoding. All it would need is a wireless connection.
Technically the camera would have to have it's own encoder (H.264) and a place where you can configure the Flash Media Server to stream to within it's built-in configuration.
Parts of this answer comes from: AskUbuntu: Security camera system server
Certain IP Cameras, in several flavors, brand names and models, provide their own web page for setup/preview/monitor, from which you can extract the portions of code that you can use in your own project in a website.
You don't say what do you have in mind by streaming to justin.tv or other web based streaming service but if what you wish to achieve is to get the benefit of the popularity of the web based streaming service itself to gain audience, then this solution IS NOT FOR YOU.
But if you are using a web based streaming service just to gather the portions of code in order to be used in a customized website of your own, then you can use the code provided by your own IP Camera.
As far as I know, the majority of the IP cameras, as those shown in
this virtual shop, starting from $ 945.00 Mexican Pesos (almost
100 US Dollars), and this D-Link DC-900 (the majority of them
tested by me) resolves the motion detection, scheduled recording and
remote control by itself (there are just a few which features 360°
movement, remote controlled).
How to reach your cameras from outside is as easy as getting a Dynamic
Domain Name Service and to use it in your modem/router or, if you have
fixed IP then you don't have a problem, you will also be in need to
route the specific ports to the cameras and make the cameras respond
to the petitions of a specific port.
Everything can be monitored/controlled via web browser, like in this
example of my security system which is embedding 3 cameras (1 of them
remote controlled) in a single web page. (blurred where needed for
privacy).
The remote controlled camera is the one shown here, with two-way
audio (yes, you can speak to people close to the camera), wireless and
infra-red night vision. (Sorry, I don't sell these cameras but I
purchased over there in Mexico City.)
In the examples provided here I am using the portions of code of the original IP Camera web page monitoring system, as shown in the next picture:
Original DCS-900 Camera's Web Based Application
So I think this can be done directly from the IP Camera web application but as I mentioned before, if what you wish is to get advantage on the web based streaming service (for getting audience), you may wish to consider a different choice.
Good luck!
You can use CamStreamer RTMP client - An application which is running directly in Axis IP camera. The camera with CamStreamer pushes the video to any RTMP streaming service (LiveStream, uStream, YouTube Live,...).
I am building an iOS App which displays video streams from a somewhat complex backend. Now while developing I want to be able to have some sort of test video stream, which I can use. Ideally this would also work without internet connection.
The video stream could show for example the current time or just a simple animation. What would be a good way of doing this on a Mac without having to install a whole suite of tools.
On you Mac you can setup a webserver or streaming server to provide you with a constant video stream for testing purposes. You won't need Internet access. You will, of course, need to ensure that the OSX firewall is either disabled or allows requests to the ports (80, most likely).
Two simple approaches I can see:
Wowza MPEG-TS stream of the Webcam on your mac
Install Wowza Media Server; developer license is free
Configure a basic applicaiton with MPEG-TS streaming
Use an encoding applicaiton, like Flash Media Live Encoder (free), Wirecast (demo version free), or some other software and start streaming from your webcam to the WMS
alternatively, with a bit more effort, you could setup Wowza to stream a file in a loop
be sure to get the codec settings correct
M3U8+MPEG-TS static files over plain HTTP
Simple Setup a basic webserver (lighttpd, Apache httpd, Apache Tomcat, whatever) to server static files
Whip up an M3U8 file to first point to a .ts media file, and then secondly back to itself
Have a look at MPEG-TS/M3U8 live stuff to work out the details. You'll need a properly segmented video file to start with.
I've been looking for a way to monitor file uploading information without using flash, but probably using ajax, i suppose. I want to monitor speed and percentage of finished file upload.
Do you know of any resource that describes how to do that, or what i should follow to do it ?
In the pre-HTML5 world I believe this requires web-server support. I've used this Apache module successfully in the past:
http://piotrsarnacki.com/2008/06/18/upload-progress-bar-with-mod_passenger-and-apache/
The only way without flash is to do it on the server. The gist is:
Start the file upload
Open a streaming connection to the server
Have the server read the post headers to tell you how large the file is going to be
Have the server repeatedly check the file size (in /tmp generally) to see how complete it is
stream the % done back to the client
I've done it before in other languages, but never in ruby, so not sure of a project that's done it, sorry.