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  • Make public webcam. Which protocol, which codec. (Using VLC)

    - by gsedej
    Hi! I want to use my old (1GHz) PC as webcam video stream server (like you can see those road cameras). I thought of using VLC and already tried using http output but it was not really good. Too cpu hungry, too big stream (kBps), not stable... I been reading VLC how-to's but thre is still a question. Which output should I use? Http, RTSP, UDP? I want to make for more than one computer at the same time (multicast). Which codec should be good? PC is not so fast so it shouldn't be too cpu hungry codec. Mpeg2, mpeg4, xvid? how much video buffer should I use (vb=?)? What about setting IP and ports? So I need some help with ideas, but if someone can make a VLC command line it's even better :) Oh, computer has direct internet connection and own IP.

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  • What is the most concise, unambiguous syntax for operator associated methods (for overloading etc.) that doesn't pollute the namespace?

    - by Doug Treadwell
    Python tends to add double underscores before its built-in or overloadable operator methods, like __add(), whereas C++ requires declaring overloaded operators as operator + (Thing& thing) { /* code */ } for example. Personally I like the operator syntax because it seems to be more explicit and keeps these operator overloading methods separated from other methods without introducing weird prefix notation. What are your thoughts? Also, what about the case of built-in methods that are needed for the programming language to work properly? Is name mangling (like adding __ prefix or sys or something) the best solution here? What do you think about having another type of method declaration, like ... "system method" for lack of creativity at the moment. So there would be two kinds of declarations: int method_name() { ... } system int method_name() { ... } ... and the call would need to be different to distinguish between them. obj.method_name(); vs obj:method_name(); perhaps, assuming a language where : can be unambiguously used in this situation. obj.method_name() vs obj.(system method_name)() Sure, the latter is ugly, but the idea is to make the common case simple and system stuff should be kept out of the way. Maybe the Objective-C notation of method calls? [obj method_name]? Are there more alternatives? Please make suggestions.

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  • Twitter search API VS Operators

    - by supermogx
    I've found this page about the Twitter search API and some operators : http://search.twitter.com/operators But is it possible to make a search like : All posts containing the words "ipod OR ipad" AND all posts containing the words "funny OR joke" ? Like : "happy AND hour" OR "ipod AND ipad" this doesn't look like it's possible.

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  • Pipe an infinite stream to internal loop?

    - by Sh3ljohn
    I've seen a lot of things about redirecting stdout to a TCP socket, but no real example of how to do it in practice, specifically when the output stream generated by the first "command" never ends. To talk about something concrete, let's take programs like servers that typically output their log endlessly to stdout (well, as long as they run). If you redirect the output to a log file on the disk, then this file is always open (therefore not readable by others?) and grows infinitely, which eventually is going to cause problems. This might be a nood question, but I don't know what it does or how to do it so. How to redirect the output of a command to the internal loop? I want to make sure that data is sent EVERY time something is written to stdout, and that the pipe won't wait for the command to end (never happens ideally!). Is that right? If 2 is true, is there a buffer system to send chunks of data once it reaches a certain size only? Could you give me concrete command line examples to do the above? Thanks in advance

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  • C# Implementing a custom stream writer-esque class

    - by Luke
    How would I go about writing my own stream manipulator class? Basically what I'm trying to wrap my head around is storing the reference to the underlying stream in the writer. For example, when writing to a memory stream using a StreamWriter, when a Write() is made, the underlying memory stream is written to. Can I store the reference to an underlying stream without using pointers or unsafe code? Even if it was just a string I wanted to "write" to. Really this has little to do with stream writers, and I'm just wondering how I could store references in a class. The StreamWriter was the best example I could come up with for this.

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  • Naudio - putting audio stream into values [-1,1]

    - by denonth
    Hi all I need to put my audio stream into values of [-1,1]. Can someone tell me a good approach. I was reading byte array and float array from stream but I don't know what to do next. Here is my code: float[] bytes=new float[stream.Length]; float biggest= 0; for (int i = 0; i < stream.Length; i++) { bytes[i] = (byte)stream.ReadByte(); if (bytes[i] > biggest) { biggest=bytes[i]; } } and I don't know how to put values into stream. Because byte is only positive values. And I need to have from [-1,1] for (int i = 0; i < bytes.Count(); i++) { bytes[i] = (byte)(bytes[i] * (1 / biggest)); }

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  • playing incoming video stream

    - by mawia
    Hi! all, I am writing an application which is a kinda video streamer.The client is receiving a video stream using udp socket.Now as I am receiving the stream I want to play it simultaneous.It is different from playing local video file lying in your hard disk in which case it can be as simple as running the file using system("vlc filename").But here many issues are involved like there can be delay in receiving and player will have to wait for the incoming data.I have come to know about using vlc to run a video stream.Can you please elaborate the step for playing the stream using vlc.I am implementing my application in c++. EDIT: Can somebody give me some idea regarding VLC API which can be used to stream a given video to particular destination and receive that stream at other end play it. with regards, Mawia

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  • php/ssh2 script does not display the stdout to $stream

    - by kamal
    The following php script works for simple linux commands, like ps -ef , but when i use ./dstat -t -a , it seems to hang and i dont get the prompt back on my local machine. Kep in mind that all commands are executed over ssh on a remote host: <?php $target = time() . '_' . 'txt'; if($ssh = ssh2_connect('10.1.0.174', 22)) { if(ssh2_auth_password($ssh, 'root', 'kmoon77')) { //$stream = ssh2_exec($ssh, 'whoami'); $sCommand = 'dstat -a'; //$sCommand = 'ps -ef'; $stream = ssh2_exec($ssh, $sCommand); //$stream = ssh2_exec($ssh, 'pwd'); stream_set_blocking($stream, true); $data = ''; while($buffer = fread($stream, 4096)) { $data .= $buffer; } //fclose($stream); echo $data; // user } } ?>

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  • In .NET when I get a response stream from the server what type of encoding type should I use?

    - by Max
    In the following example I m getting a response from the server; however do I need to set ASCII or UTF8 encoding type ? Dim objURI As Uri = New Uri(URL) Dim wReq As WebRequest = WebRequest.Create(objURI) Dim wResp As WebResponse = wReq.GetResponse() Dim respStream As Stream = wResp.GetResponseStream() Dim reader As StreamReader = New StreamReader(respStream, Encoding.ASCII) Dim respHTML As String = reader.ReadToEnd() wResp.Close()

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  • Secondary DHCP server won't start on Centos 6.2

    - by Slowjoe
    I'm trying to create a backup DHCP server. Server times are in sync. Primary server starts fine. Secondary server won't start. Error from /var/log/messages is: Sep 15 14:47:45 stream dhcpd: Copyright 2004-2010 Internet Systems Consortium. Sep 15 14:47:45 stream dhcpd: All rights reserved. Sep 15 14:47:45 stream dhcpd: For info, please visit https://www.isc.org/software/dhcp/ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 25: invalid statement in peer declaration Sep 15 14:47:45 stream dhcpd: #011max-response-default Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 41: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 49: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: WARNING: Host declarations are global. They are not limited to the scope you declared them in. Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 70: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: /etc/dhcp/dhcpd.conf line 78: failover peer dhcp-failover: not found Sep 15 14:47:45 stream dhcpd: failover peer "dhcp-failover" Sep 15 14:47:45 stream dhcpd: ^ Sep 15 14:47:45 stream dhcpd: Configuration file errors encountered -- exiting Sep 15 14:47:45 stream dhcpd: Sep 15 14:47:45 stream dhcpd: This version of ISC DHCP is based on the release available Sep 15 14:47:45 stream dhcpd: on ftp.isc.org. Features have been added and other changes Sep 15 14:47:45 stream dhcpd: have been made to the base software release in order to make Sep 15 14:47:45 stream dhcpd: it work better with this distribution. Sep 15 14:47:45 stream dhcpd: Sep 15 14:47:45 stream dhcpd: Please report for this software via the CentOS Bugs Database: Sep 15 14:47:45 stream dhcpd: http://bugs.centos.org/ Sep 15 14:47:45 stream dhcpd: Sep 15 14:47:45 stream dhcpd: exiting. Config file contents: # DHCP Server Configuration file. # see /usr/share/doc/dhcp*/dhcpd.conf.sample # see 'man 5 dhcpd.conf' # option domain-name "eng.foo.com"; option domain-name-servers ns0.eng.foo.com, ns1.eng.foo.com; option ntp-servers ntp.eng.foo.com; #option time-servers ntp.eng.foo.com; default-lease-time 3600; max-lease-time 7200; authoritative; log-facility local7; failover peer "dhcp-failover" { secondary; address 10.0.1.70; port 647; peer address 10.0.1.11; peer port 647; max-response-default 30; max-unacked-updates 10; load balance max seconds 3; } # # Management subnet # subnet 10.0.0.0 netmask 255.255.255.0 { option subnet-mask 255.255.255.0; option broadcast-address 10.0.0.255; option routers 10.0.0.1; option domain-search "eng.foo.com", "foo.com"; # Unknown clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 300; range 10.0.0.240 10.0.0.249; allow unknown-clients; } # Known clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 28800; range 10.0.0.150 10.0.0.199; deny unknown-clients; } include "/etc/dhcp/dhcpd.conf-engmgmt"; } # # Data subnet # subnet 10.0.1.0 netmask 255.255.255.0 { option subnet-mask 255.255.255.0; option broadcast-address 10.0.1.255; option routers 10.0.1.1; option domain-search "eng.foo.com", "foo.com"; # Unknown clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 300; range 10.0.1.240 10.0.1.249; allow unknown-clients; } # Known clients get this pool pool { failover peer "dhcp-failover"; max-lease-time 28800; range 10.0.1.150 10.0.1.199; deny unknown-clients; } # For centos network installs if substring (option vendor-class-identifier, 0, 8) = "anaconda" { filename "/autohome/distro/ks/"; next-server eng-data.eng.foo.com; } # For PXE network installs if substring (option vendor-class-identifier, 0, 9) = "PXEClient" { filename "pxelinux.0"; next-server eng-data.eng.foo.com; } # For KVM PXE network installs if substring (option vendor-class-identifier, 0, 9) = "Etherboot" { filename "pxelinux.0"; next-server eng-data.eng.foo.com; } include "/etc/dhcp/dhcpd.conf-engdata"; }

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  • How to send Sound Stream of a file from disk over network using FMOD?

    - by chris
    Hey everyone, i'm currently working on a project in college. my application should do some things with audio files from my computer. i'm using FMOD as sound library. the problem i have is, that i dont know how to access the data of a soundfile (wich was opened and startet using the FMOD methods) to stream it over network for playback on another pc in the net. does anyone has a similar problem?! any help is apreciated. thanks in advance. chris

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  • how to model a follower stream in appengine?

    - by molicule
    I am trying to design tables to buildout a follower relationship. Say I have a stream of 140char records that have user, hashtag and other text. Users follow other users, and can also follow hashtags. I am outlining the way I've designed this below, but there are two limitaions in my design. I was wondering if others had smarter ways to accomplish the same goal. The issues with this are The list of followers is copied in for each record If a new follower is added or one removed, 'all' the records have to be updated. The code class HashtagFollowers(db.Model): """ This table contains the followers for each hashtag """ hashtag = db.StringProperty() followers = db.StringListProperty() class UserFollowers(db.Model): """ This table contains the followers for each user """ username = db.StringProperty() followers = db.StringListProperty() class stream(db.Model): """ This table contains the data stream """ username = db.StringProperty() hashtag = db.StringProperty() text = db.TextProperty() def save(self): """ On each save all the followers for each hashtag and user are added into a another table with this record as the parent """ super(stream, self).save() hfs = HashtagFollowers.all().filter("hashtag =", self.hashtag).fetch(10) for hf in hfs: sh = streamHashtags(parent=self, followers=hf.followers) sh.save() ufs = UserFollowers.all().filter("username =", self.username).fetch(10) for uf in ufs: uh = streamUsers(parent=self, followers=uf.followers) uh.save() class streamHashtags(db.Model): """ The stream record is the parent of this record """ followers = db.StringListProperty() class streamUsers(db.Model): """ The stream record is the parent of this record """ followers = db.StringListProperty() Now, to get the stream of followed hastags indexes = db.GqlQuery("""SELECT __key__ from streamHashtags where followers = 'myusername'""") keys = [k,parent() for k in indexes[offset:numresults]] return db.get(keys) Is there a smarter way to do this?

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  • PHP: Grab an image from a stream (in an img tag) but if it's not there, i don't want the img tag wri

    - by Gary Willoughby
    I currently have code like this in a web based file called 'view_file.php' to grab an image from an internal network. <img src="put_file.php?type=<?=$TN_TYPE;?>&path=<?=$TN_PATH;?>&filename=<?=$TN_FILENAME;?>" /> The 'put_file.php' script allows access to an internal server that we don't want to expose to the internet. This script checks to see if an image is available and if it is, sends an image header and then uses readfile() to stream the image to the 'view_file.php' page. The problem is if there isn't an image available, instead of streaming a temporary 'spacer.gif' i want to not have the img tag written at all. Any Ideas how to do this? I'm thinking maybe move the img tag into the 'put_file.php' script, but how to mix strings and steams?

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  • How to get the stream of a public Facebook fanpage in php?

    - by Bundy
    Hi, I want to display my public fanpage feed onto my website via the Facebook API without requiring a login. I'm doing this require_once('../includes/classes/facebook-platform/php/facebook.php'); $fb = new Facebook($api_key, $secret); $fb->api_client->stream_get('',$app_id,'0','0','','','','','')); But I get this error Fatal error: Uncaught exception 'FacebookRestClientException' with message 'user id parameter or session key required' in includes/classes/facebook-platform/php/facebookapi_php5_restlib.php:3065 Stack trace: #0 includes/classes/facebook-platform/php/facebookapi_php5_restlib.php(1915): FacebookRestClient->call_method('facebook.stream...', Array) #1 facebook/api.php(12): FacebookRestClient->stream_get('', 13156929019, '0', '0', 30, '', '', '', '') #2 {main} thrown in includes/classes/facebook-platform/php/facebookapi_php5_restlib.php on line 3065 Then I figured, because of 'user id parameter or session key required', to add my user id to the call require_once('../includes/classes/facebook-platform/php/facebook.php'); $fb = new Facebook($api_key, $secret); $fb->api_client->stream_get(502945616,13156929019,$app_id,'0','0','','','','','')); But then I got this error Fatal error: Uncaught exception 'FacebookRestClientException' with message 'Session key invalid or no longer valid' I'm totally clueless :)

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  • How to redirect a live data stream adding to it another header and returning it on demand? (PHP)

    - by Ole Jak
    I have a url like http://localhost:8020/stream.flv On request to my php sctipt I want to return (be something like a proxy) all data I can get from that URL (so I mean my php code should get data from that url and give it to user) and my header and my beginning of file. So I have my header and some data I want to write in the beginning of response like # content headers header("Content-Type: video/x-flv"); header("Content-Disposition: attachment; filename=\"" . $fileName . "\""); header("Content-Length: " . $fileSize); # FLV file format header if($seekPos != 0) { print('FLV'); print(pack('C', 1)); print(pack('C', 1)); print(pack('N', 9)); print(pack('N', 9)); } How to do such thing?

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  • How to copy one Stream to a byte array with the smallest C# code?

    - by estourodepilha.com
    Until now I am counting 12 LoCs. Could you make it smaller? using (Stream fileStream = File.OpenRead(fileName)) { using (BinaryReader binaryReader = new BinaryReader(fileStream)) { using (MemoryStream memoryStream = new MemoryStream()) { byte[] buffer = new byte[256]; int count; int totalBytes = 0; while ((count = binaryReader.Read(buffer, 0, 256)) > 0) { memoryStream.Write(buffer, 0, count); totalBytes += count; } memoryStream.Position = 0; byte[] transparentPng = new byte[totalBytes]; memoryStream.Read(transparentPng, 0, totalBytes); } } }

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  • Best way to convert Stream (of unknown length) to byte array, in .NET?

    - by Frank Hamming
    Hello, I have the following code to read data from a Stream (in this case, from a named pipe) and into a byte array: // NPSS is an instance of NamedPipeServerStream int BytesRead; byte[] StreamBuffer = new byte[BUFFER_SIZE]; // defined elsewhere (less than total possible message size, though) MemoryStream MessageStream = new MemoryStream(); do { BytesRead = NPSS.Read(StreamBuffer, 0, StreamBuffer.Length); MessageStream.Write(StreamBuffer, 0, BytesRead); } while (!NPSS.IsMessageComplete); byte[] Message = MessageStream.ToArray(); // final data Could you please take a look and let me know if it can be done more efficiently or neatly? Seems a bit messy as it is, using a MemoryStream. Thanks!

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  • How do I overload an operator for an enumeration in C#?

    - by ChrisHDog
    I have an enumerated type that I would like to define the , <, =, and <= operators for. I know that these operators are implictly created on the basis of the enumerated type (as per the documentation) but I would like to explictly define these operators (for clarity, for control, to know how to do it, etc...) I was hoping I could do something like: public enum SizeType { Small = 0, Medium = 1, Large = 2, ExtraLarge = 3 } public SizeType operator >(SizeType x, SizeType y) { } But this doesn't seem to work ("unexpected toke") ... is this possible? It seems like it should be since there are implictly defined operators. Any suggestions?

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  • Facebook Stream.Get -- How to access data in array?

    - by user316841
    On stream.get, I try to echo $feeds["posts"][$i]["attachment"]["href"]; It return the URL, but, in the same array scope where "type" is located (which returns string: video, etc), trying $feeds["posts"][$i]["attachment"]["type"] returns nothing at all! Here's an array through PHP's var_dump: http://pastie.org/930475 So, from testing I suppose this is protected by Facebook? Does that makes sense at all? Here it's full: http://pastie.org/930490, but not all attachment/media/types has values. It's also strange, because I can't access through [attachment][media][href] or [attachment][media][type], and if I try [attachment][media][0][type] or href, it gives me a string offset error. ["attachment"]=> array(8) { ["media"]=> array(1) { [0]=> array(5) { ["href"]=> string(55) "http://www.facebook.com/video/video.php?v=1392999461587" ["alt"]=> string(13) "IN THE STUDIO" ["type"]=> string(5) "video" My question is, is this protected by Facebook? Or we can actually access this array position?

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  • cancel stream request from WCF server to client

    - by ArsenMkrt
    Hi, I posted about stream request here [wcf-chunk-data-with-stream]:http://stackoverflow.com/questions/853448/wcf-chunk-data-with-stream I solved that task but now when i close request in client part server continue to send data. is it possible to cancel stream request from WCF server to client?

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  • Changing namespace of Stream

    - by phenevo
    Hi, I've got asmx with method [Webmethod] public Ssytem.IO.Stream GetStream(string path) { ... } and winforms application which has webreference to this webservice. I cannot do something on my winforms application like something: var myStream= (System.IO.Stream)client.GetStream(path); because i Cannot cast expression "MyWinformsApp.MyService.Stream" to Stream. Why is that ?

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  • How to stream semi-live audio over internet

    - by Thomas Tempelmann
    I want to write something like Skype, i.e. I have a constant audio stream on one computer and then recompress it in a format that's suitable for a latent internet connection, receive it on the other end and play it. Let's also assume that the internet connection is fairly modern and fast, i.e. DSL or alike, no slow connections over phone and such. The involved computers will also be rather modern (Dual Core Intel CPUs at 2GHz or more). I know how to handle the audio on the machines. What I don't know is how to transmit the audio in an efficient way. The challenges are: I'd like get good audio quality across the line. The stream should be received without drops. The stream may, however, be received with a little delay (a second delay is acceptable). I imagine that the transport software could first determine the average (and max) latency, then start the stream and tell the receiver to wait for that max latency before starting to play the audio. With that, if the latency doesn't get any higher, the entire stream will be playable on the other side without stutter or drops. If, due to unexpected IP latencies or blockages, the stream does get cut off, I want to be able to notice this so that I can take actions (e.g. abort the stream) and eventually start a new transmission. What are my options if I want do use ready-made software for the compression and tranmission? I have no intention to write my own audio compression engine, really. OTOH, I plan to sell the solution in a vertical market, meaning I can afford a few dollars of license fees per copy, but not $100s. I guess the simplest solution would be to just open a TCP stream, send a few packets back and forth to determine their running time (or even use UDP for that), then use the results as the guide for my max latency value, then simply fire the audio data in its raw form (uncompressed 16 bit stereo), along with a timing code over the TCP connection. The receiver reads the data and plays it with the pre-determined delay. That might just work with the type of fast connection I expect. I just wonder if there are better solutions to reach this goal, with better performance (lower latency) and less data (compressed). BTW, I first try to implement this on OS X, but might want to do it on Windows, too, if it proves successful.

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