I am studying face detection system, but I have a problem, and I need help. I've read and tried many pictures from the internet, but I still can't.
I want to display "rtsp //:" live streaming on a response by nodejs.
My URL:
rtsp://username:password#IP:554/cam/realmonitor?channel=1&subtype=0
I have a username and password. But I can't show the stream on the website.
Displaying RTSP in a browser directly is generally not supported - there are and have been many workarounds over the years and you can see some of then history in answers like this:How can I display an RTSP video stream in a web page?
I think you may find it easier to convert the RTSP into another format - WebRTP is an obvious choice given its widespread support now and the fact that is realtime (priorities latency over video quality), unlike many popular video streaming protocols (prioritise video quality over latency).
There are some open source solutions that can help - this one appears well used and has recent activity:
https://github.com/deepch/RTSPtoWebRTC
Related
I am using Azure Blob Storage to store a video. I would like a user to be able to scroll the video to any point in time and play it from there.
For short videos, there is no problem because the whole video loads and you can do that, but for larger videos, it does not seem to work out of the box. And in some sense it makes sense - files by default do not have the functionality to be downloadable from the middle. But all decent video streaming websites offer this functionality. I must be missing some video concepts, would appreciate, if someone linked me to some articles explaining how things like this are done. Bonus points if the solution is using Microsoft Azure.
Large video example (28 secs, 126MB):
https://www.w3schools.com/code/tryit.asp?filename=GP328W3SEY77
Small video example (10 secs, 1MB):
https://www.w3schools.com/html/tryit.asp?filename=tryhtml5_video
Video streaming servers or cloud services are usually dedicated specialised servers and their functionality can be quite complex.
A video 'file' typically consists of one or more video and audio tracks in a 'container' like MP4. The container will have header information and pointers to the track info.
Simple HTTP streaming of an mp4 file is possible if your server supports range requests, i.e. downloading parts of the file at a time, and if the header information is at the start of the video file - in mp4 is it usually at the end by default but can be moved to the start.
More sophisticated streaming servers, including most/all of the popular commercial services, use a dedicated streaming protocol, typically ABR HLS or DASH these days. These provide chunked multiple different bit rate versions of the video and allow the client switch between bit rates for each chunk it downloads - see more info here: https://stackoverflow.com/a/42365034/334402
The thumbnails you see when you scroll along a video timeline are actually usually a separate track in the video file or stream. They are a set of images at timepoints and the entire set of thumbnails can be downloaded quickly at the start of playback to give a view of what a particular part of the video will look like if the user wants to jump to it. When the user actually jumps to that section of the video, the client requests from the server the chunks or section of the file corresponding to that thumbnail.
Azure CDN actually provides some nice functionality:
video starts to play instantly (browser doesn't need to wait for the video to fully load)
you can scroll back/forward in time.
(Obviously, this in addition to the standard CDN functionality of multiple PoP, caching, etc.)
The above CDN setup was tested on Standard Microsoft, but Verizon and Akamai seem to be offering similar functionality.
So I lead a team of engineers located across 3 timezones, and when we have a meeting we record it, so that it can reviewed at a later date. Currently we are just storing it on an apache server. If someone wants to watch one of the videos they must download it and then watch it.
Would it be possible to configure it so that they could stream the videos instead of downloading them?
Thanks :)
If the video is mp4, and if you have reasonable bandwidth available, then you can simply make the video available on your server and use the HTML5 video tag on a web page to stream it.
If you don't have or don't want a separate web page just for this, then you can use a general purpose video player, such as VLC http://www.videolan.org/vlc/index.html, and simply provide the URL to the video on your server.
One thing to be aware of - a regular MP4 file has the metadata at the end of the file, but for streaming you want this to be moved to the start of the file. There are several tools which will do this (google mp4 fast start) - here is an example:
https://github.com/danielgtaylor/qtfaststart
For sometime now I've been trying to do something that I never thought that it would be that hard: audio streaming. My objective is simple; a simple web app through which a certain someone can click a button and live-stream his own voice to other people using this app. It's an online classroom of sorts. Here's the details:
A broadcast/lecture is scheduled for a certain date and time (done)
A user logs-in as a teacher/instructor to a simple interface where he can click "start broadcasting" (done)
When the instructor clicks "broadcast" his voice is streamed to other users. Other student-type users can also log in and start listening to THE BROADCAST this teacher started. (and here is the trick!)
The broadcast itself should be automatically stored to a local file in the process. So that students can go back to it anytime.
Of course I spent so many hours googling and stackoverflow-ing this problem, and here is what I could understand so far:
If the starting point is the browser, I must use the GetUserMedia API, the result is raw PCM data that I can download, send to server or stream to others. (simple)
Offering the broadcast to the listeners (students) will be done via HTML5's Audio API. (simple)
WebRTC cannot help me here, because it's a p2p thing, there cannot be a server middling in the process, and I NEED TO KEEP A COPY OF THE LECTURE LOCALLY. (Here's a working example)
I can use tools like Binary.js to stream the audio binary data to the students, but this requires a file to be present already on the desk.
I need to convert the PCM data to a format like MP3 or OGG in the process, and not use WAV because it's much expensive bandwidth-wise.
I feel like it should be straight forward, but I cannot get it to work, I cannot piece all of this together and offer a stable and good experience for the user.
So again, I would love to know how to do the following:
Break the GetUserMedia raw data into packets and convert it to mp3, stream it to the server, where a script (NodJS probably) can store it locally and stream it whoever tuned-in, in real time.
I am open to whatever tool you recommend, I know that NodeJS will be present in the solution, and I am happy to use it. If the streaming could be done via a 3rd-party tool, I have no problem with that.
Thanks you in advance.
I see your comment about WebRTC, but I think you should investigate it more.
Like what you see here in this (old) post: http://servicelab.org/2013/07/24/streaming-audio-between-browsers-with-webrtc-and-webaudio/
Otherwise, you might have to go for a third party solution, like https://www.crowdcast.io/
(Even if you find a video-only solution, you can use a static picture or so for the video)
Event broadcasting is a good business for many companies. If it was that easy, there wouldn't be only few and well known competitors in the market.
In my project, I need to be able to compress small audio files so that it can be transferred easily from server to the client. I found We Chat uses audio compression closest to my requirement. But I couldn't find ways of doing it
I'm able to write code for image compression by reducing resolution and clarity. What should I try here ? combine two frames into one etc. Streaming is definitely possible if two frames are mixed into one. I want to know if there are any well developed libraries to do the same. I'm easy on the format until client side is able to read it. I also want to know if streaming is possible in compressed format.
I run a wiki that deals with the specifics of all kinds of multimedia technology. You might be interested in the Audio Codecs category, currently cataloging about 150 different audio codecs.
I can't tell from your question if you control both the client and server, or if you only control the server. If you control both, try a simple IMA ADPCM variant in order to get started. If you don't control the client, then of course your will need to code towards whatever the client can support.
There are many more codecs, of course, and lots of them have existing open source implementations that you may wish to leverage.
Sorry if the question is confused, as I'm confused myself. I'm working around these requirements:
I'm building a public website where I need to display video.
I need to control what the player looks like
I'm the sole publisher of the video, meaning it can't be on YouTube for example
I need as much protection as possible in terms of protecting the content from being downloaded
So, I've read around StackOverflow and the web, and found lots of suggestions, like numerous flash players, Streaming servers, DRM protocols, services like Panda etc etc.
The problem is I don't understand how everything fits together.
For example, what makes my video content secure?
Is it the player on the client? is it the server that hosts the content? is it the streaming process? who hosts the streaming servers and what difference does this make?
Bearing in mind this is otherwise a very simple site, and is not a business venture.
if you were working around my requirements, what would you do? Could you explain step by step at a high level?
EDIT:
Just based on a couple of answers, I'm not saying no one can ever download my content. And I realize this kind of thing is expensive.
I'm just asking, if you had my requirements, what would you do? And could you explain it to me so i understand?
thanks again
Edit:
Thanks again for all the feedback, I can't vote anyone up as I'm a new user, but your answers have been very helpful.
The one thing I will say, is that my only request was to attempt security, that is 'make it difficult' for most users...that is common in software security.
Some of the suggestions have been just to not even try.
My question was really based around the fact that I know nothing about video deployment on the web, apart form the basic embedded swf flv combo.
Anyway, your info has been very useful though. I'll try a simple "real" streaming service (as opposed to HTTP streaming).
Any other recommendations would be awesome
cheers
"For example, what makes my video content secure? " Nothing.
"Is it the player on the client?" Neither. Anyone can write a client and retain the video content. Remember this. Anyone can write a client. This client can absorb and save your video. Nothing can stop this. Nothing.
"is it the server that hosts the content?" No. Server is only one piece of security. You have to secure the protocol. And the client. And anyone can write a client and retain the video content.
"is it the streaming process?" No. Protocol is only one piece of security. You have to secure the server, the protocol and the client. And anyone can write a client and retain the video content.
"who hosts the streaming servers and what difference does this make?" You host the streaming video servers. Otherwise, you might as well use YouTube.
Edit
"The problem is I don't understand how everything fits together."
"For example, what makes my video content secure?"
These are unrelated. You keep mentioning security, AND not knowing how "everything" fits together.
Here's a suggestion: stop mentioning security -- edit your question to eliminate all references to security and see if you get more useful answers.
Many companies sell streaming media servers. You put HTML in your page that references the streaming media site.
Example. Apple sells Quicktime media server. Read http://developer.apple.com/documentation/QuickTime/Conceptual/QTScripting_HTML/QTScripting_HTML_Document/chapter_1000_section_1.html for lots of information on how to present video from quicktime.
Before you go too far worrying about setting up these secure streaming protocol client server whatevers, make sure you weigh up the cost of your time getting this going, versus the cost of someone downloading your video.
Just to be clear: if your server is sending to a client, then they can copy (download) it. There's no way around it.
Response to your comment:
What I'd probably try doing if you wanted to try to avoid users downloading the files is this (I'll assume you're using FLV files, since they're the de facto standard on the web these days):
Put the FLV files in a non web-accessible directory.
Have a player.swf file request the file via a script on your site, eg: video.php?file=myVideo.flv
The video.php can then perform whatever security checks you'd like: for example, require logins, check the referrer, etc.
If the security checks are ok, then pass through the appropriate video file. If not, then perhaps have a short back-up video which is an ad for your site or something, saying "to watch this video, please come to mysite.com!"
Mostly video streaming sites like Hulu achieve a kind of poor-man's security by using RTMP to transfer the video data. You would need special server software to serve video via RTMP, for example Adobe Flash Media Server or WebORB.
RTMP is a proprietary protocol, so this is a case of security through obscurity; it's non-trivial to download a copy of the video (you can't just grab the file from a URL), but there are programs out there that are capable intercepting the stream and keeping a copy.
2.I need to control what the player looks like
Download and customise a free player like OSFLV.
4.I need as much protection as possible in terms of protecting the content from being downloaded
Forget it.
DRM for FLV exists, but you'll have to pay Adobe a load of money for Flash Media Server and Flash Media Rights Management Server, you'll lose client compatibility and ease of deployment, and in the end it's still breakable. Big old waste of time.
Accept that some people will download your videos, and put a big watermark on them so at least when they do you're getting free advertising.