Hello I am trying to reproduce a video from a specific time with icecast but I have not found any option oh how to do it.
Any idea ?
Thanks
Gorka
This answer will be to the question: "How to schedule broadcasts with Icecast as the streaming server"
The answer is rather simple: Icecast has no role in scheduling what is broadcast
The longer answer is:
It's up to you to set up your source client(s) in a way that they do things at the time you want them to. This could be:
Have a playlist (simplest)
Tell a source client what to play at predefined times, by way of e.g. a script
Use a full-blown automation broadcast scheduling/automation solution (most complicated, e.g. airtime or OpenBroadcaster)
Related
SO sorry if this is a duplicate, I tried searching for this but wasnt sure what search terms to use and didnt really find anything
I'm currently research on how to set up a schedule of job-to-do when a server start on my application. The function I want to make is like sending a weekly/monthly mail to all the users. The problem is, if the quantity of the mail need to send is enormous, Which cant be send in just a few hours (I dont like to sent mail to users at the time of night); It will pause and continue this job in the next morning....
So far as I've searched, I found two gems: resque-scheduler and rufus-scheduler. I don't really know which one should I focus on digging on.
Can anyone point me out which general direction shout I go? Which one of those has built-in function can doing task like those ? Or I need to set up schedule on my own ?...
Look at resque-scheduler (it uses rufus-scheduler and resque behind the scenes).
I did my best to search all topics regarding to SCADA and developing your own C++ desktop application to communicate with PLCs, but could not find any recent, or in my opinion, relevant topics that fit what I needed. If I missed them, a link to them would be very much appreciated. If I also happened to post this in the wrong section, or you can think of a better section for me to post this in, I will take it there.
With that said, I thank you in advance for taking the time to read my questions, and appreciate any input you have to offer.
A little bit about what I'm doing
I'm currently in school for electromechanical engineering, and for my final year project I am developing a desktop application in C++ to monitor PLCs we have located within one of our labs.
Within this lab, I have a pre-existing ethernet network connecting all PLCs to single point, which I am tying into with a PC, and will be doing all my work from there.
I will be developing the application in Qt for an easy way to design the GUI, and giving me access to the QNetworkInterface as well as QTcpSocket.
With that said, I wouldn't go as far as saying I'm an experienced programmer, but I have been fooling around with a few languages (i.e.: python, c++, c, php) for quite a few years, and am still learning, considering the learning NEVER stops.
My questions
Is there any reference material I can read, that you can suggest, on the subject to more easily understand what sort of process I need to go through to receive information (i.e.: individual I/Os, status bits, tags, logs, etc...) from the PLCs directly, and not through an OPC server?
If an OPC server is required, I've never dealt with OPC links other than using Rockwell Automations RSLinx to grab tags and display their values within excel (I had created a prototype using that exact method to start, but would like to move away from excel, and if possible, the OPC server (RSLinx) as well). What would you suggest to someone who knows nothing about the subject of OPC servers, or to my knowledge, OPC in general?
Have any of you previously written your own application to do something similar, if not of the same nature to what I'm trying to accomplish?
What advice or suggestions would you give for someone who is attempting this type of project?
PS: As a start for this project, I would initially just want to get the reading of the I/Os (tags or addresses) to view what their current values are (closed or open for inputs, energized or not for outputs). But eventually I would also like to be able to write values to tags on the PLCs I'm monitoring based on the values I've received from them.
PSS: I would like to note again, that I am still a student, and am still learning about this subject in it's entirety. I would just like to ask for your patience, as I may not grasp things completely the first time!
If I've missed any information you feel is pertinent to be able to provide an answer, please let me know! I will do my best to come up with said information in a timely manner!
Thank you!
EDIT #1: Added in another question, and altered my first question slightly
EDIT #2: Fixed up question 2
IMHO a SCADA program should have as a minimum requirement to be able to connect to an OPC server. OPC is used for most commercial PLCs.
Strictly speaking there is no need to have an OPC server/client approach but it gives you flexibility and gives you an abstraction model. If you want to directly connect to PLCs using a protocol then that is of course possible as well. You then need to know more details about the protocols and their various versions.
Yes I worked for a few years in a team that developed a commercial SCADA application.
It is very easy to get lost in details in such a project so try to keep things as simple as possible. By using OPC you will save time instead of fiddling directly with the protocols. You could add the ability to add custom-drivers for other protocols - depending on your timeframe. Try to model up your project before you start coding to a birdsview of the model and avoid getting lost in the details.
I would stay well away from looking to write your own code to connect directly
to an AB PLC - there are products out there that you can use in your application:
http://www.rtaautomation.com/software/ethernetip/client/tagc/ControlWin.html
http://www.automatedsolutions.com/products/dotnet/ascomm/
You would be better to use OPC - you can write you own OPC client if you want and follow examples you find here:
http://www.opcconnect.com/source.php#freesource
According to this http://www.control.com/thread/1026173407 you should be able to get source code of Kepwares OPC Quick Client.
It would probably be easier to just use a library as in this example (RSLogix,C#):
http://www.mesta-automation.com/opc-client-with-c-an-how-to-video/
You might find this of use:
http://www.rockwellautomation.co.kr/applications/gs/ap/GSKR.nsf/files/rslinxsdk_ma_eng.pdf/$file/rslinxsdk_ma_eng.pdf
Some resources:
http://www.opcconnect.com/ ,
http://www.mesta-automation.com/
Answer to question #4 - realize that your lab technically could contain ANY manufacturer's PLCs in the future. If you ever took a Data Communications class, you realize that for N different PLC types, you would have to write N different communication drivers for your PLC client.
This is where standards are helpful. Without the use of a standard protocol, scaling your lab could become more time consuming and less manageable. This is why communications standards exist.
HOWEVER, not all PLCs necessarily support the standard(s) you may decide upon.
The best choice is OPC/UA. Many PLCs have server drivers readily available. That means that your client just needs to understand 1 protocol (OPC/UA), and then it can "easily" be connected to any PLC that has a driver for that standard.
After that, there is OPC. After that, Modbus (TCP and RTU flavors), a relatively simple industry standard that is supported by most PLCs. EtherNet/IP is also a possible choice, although not all PLCs support it in a "server" role (many do support it as a client, but that is not what you need).
have a look at pycomm in github or pylogix at github which are Python written drivers to link to clx plc.
First of all, a big thank you to anyone willing to help!
You can skip the following wall of text if you want.
Background
I am trying to make a proxy program for my own minecraft server network. I wish to use multiple servers to allow people to play creative and survival on separate servers (to reduce serverload and increase my capacity). I am planning on using the transporter plugin for the server side of things, but I'd like to prevent having to install a clientpatch.
I discovered bungeecord, but it didn't do what I needed it to (namely, forge support for a modded server I plan on adding.) for mc 1.4.7 (which I need to use due to the server I plan on adding).
At the moment the system is running using a bungeecord proxy. However, md_5 told me that I'd need to write my own proxy (or mod his) to make it work the way I want. However, I really can't wrap my head around java (I just don't get it). So I decided to write my own.
The problem
After some research I discovered this to be doable. The hardest part would be to parse the packets. So I dug around for a library to do it for me. I came across libmcnet, which seemed to be what I wanted, but all the data it produced was garbled.
Looking over some packet dumps, and referencing it with wiki.vg, I discovered that libmcnet was giving me big-endian. However, my code and computers assume little-endian.
What I have done about it
After some thinking and looking over the code I thought it easier to write my own parser using some defines from libmcnet (namely include/mcnet/packets.h). So I copied the packets.h and read.h/read.c (both of which were heavily modified) and started recoding it. I did well enough, I think, as my system can successfully parse the server's 0xff (kick) packet during the server ping.
New problems
The next hurdle proved to be decrypting the client's data. It doesn't seem to use the same data standards as the server. For instance, the packet id the server transmits is 16 bit while the client's seems to be 8 bit.
So what I want to know:
Why does my code work fine on data from the server, but fail miserably when the client sends data? I'm pretty sure that libmcnet's code (on which I based it) is wrong as well.
Can anybody help me make this code work?
Code: http://pastebin.com/jg26yity (I figured this'd be cleaner)
Thank you all for your help!
*I'll add information if anybody requests more...
PS. First question asked here, so my post is a bit messy...
I figured it out, apparently I can't assume a library written to parse the minecraft protocol actually has proper code to read the protocol...
I was digging around and verifying what was read versus manually reading it... Appearantly a byte isn't a byte with minecraft and I thought the library had it covered.
For some time now I've been tossing around what I think is am awesome idea: I want to write essentially a C++ phone server to handle all of my incoming calls on a land-line. I'll have a white-list (yay never having to worry about telemarketers ever again!), a black-list, and will be able to access my phone using my gaming headset, allowing me to make/answer calls while I'm gaming or whatever. In the future I'd also like to hook it up to a gui and make it have pop-ups and other cool features.
The problem is, I have no idea where to start. I'm familiar enough with C++, but have no idea how to go about doing anything with a phone-line. I can plug a phone-line into my computer, but I have no idea how to get my program to be able to use that connection. There's WinSock2 for being able to use my ethernet connection, is there something similar I'd be able to use to use the phone line? As it's using the same ethernet jack, I wonder if it's even possible to use WinSock2 to use the phone-line?
I saw this post, which wasn't particularly helpful: stackoverflow link , which points out Dual-tone multi-frequency signaling. I stumbled across this site: link, but isn't really going to help me get started.
So I was wondering, is there some sort of library out there that would allow me to tap into a phone-line that's connected to my computer? Is there a standard somewhere out there concerning phone-lines and what the different combinations of tone's mean? Can anyone here help get me started? I realize it's somewhat of a big undertaking, so any push in the right direction would be greatly appreciated. Thanks.
[Update:]
I found this question, which is a step in the right direction, but I'm not sure yet if it helps me (I need to go to bed, and will take a look at it in the morning). I did see mention of a Microsoft Telephony API though, I'll try doing more research on that tomorrow.
If working with MS products is not an absolute necessity, you might also consider taking a shot at Asterisk. This is an open-source PBX (in software) that allows development on Linux, Windows (emulated) and Mac. At the company where I work, we use it for implementing small-scale exchanges, about a 100 lines or so. It also interfaces well with VoIP and allows a whole host of protocols. I have developed scripts and programs in C++ that work on voice packets in real-time, and so far, my experience has been good. As for your stated use-case of blocking telemarketers etc., this would be a very good fit. Check out further details here.
After doing more research, having one link lead to another link, and coming up with new search terms, I stumbled across this site that looks like it could kick me off using the Windows Telephony API in C++: link. This link includes open source c++ samples showing how to do the basics of what this question asks, I'll just have to test to see if they actually still work.
This is only the beginning of my research, so I'll keep you posted on any other findings. If anyone else is knowledgeable in this area, please still feel free to drop me information on what I want to accomplish.
I need to be able to allow users to upload a wide variety of video files in various formats then clean them up and make them kosher for delivery to a dedicated content handler.
I've tried ffmpeg onsite but it has some serious flaws in regards to h.264.
Then I tried flixcloud.com which has a very good interface, api, and was looking like the perfect solution except it doesn't provide the video frame rate correctly.
Moving on I tried Ankoder.com and it does work, but unfortunately it's API is somewhat of a mess and has some quirks that are proving to be difficult to code around.
What other services are out there, will only accept answer from someone who has used a video transcoding service.
Update:
Just started looking at http://www.encoding.com/ - seems interesting.
I have worked with a number of transcoding services in the past and have found flaws with just about all of them. For the last 3 projects I have been involved with that involved media encoding I have used Expression Encoder, with great results. The application its self is a pleasure to use and simple to achieve the results needed, and the SDK is one of the best out there. Microsoft have definatly done a great job.