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• Why is the resulting file unplayable when I use FFMPEG to convert a MP4 video to ASF?

  - by Fuupoo

  I want to convert an .mp4 file to an .asf file, but I need to keep the size of the file below 150 mb (the server I need to upload the file to can only take files under 150 mb). Basically I want to recontain the .mp4 in an .asf file. The code I'm using currently is ffmpeg input.mp4 -c copy output.asf The command runs, however when I try to play the file on windows media player (I'm on windows xp) I get an error message saying "Windows media player has encountered a problem while playing the file." Anyone have any idea why this is happening? And what other ways I can accomplish this task?

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• Firewall still blocking port 53 despite listing otherwise?

  - by Tom

  I have 3 nodes with virtually the same iptables rules loaded from a bash script, but one particular node is blocking traffic on port 53 despite listing it's accepting it: $ iptables --list -v Chain INPUT (policy DROP 8886 packets, 657K bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT all -- lo any anywhere anywhere 2 122 ACCEPT icmp -- any any anywhere anywhere icmp echo-request 20738 5600K ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT tcp -- eth1 any anywhere node1.com multiport dports http,smtp 0 0 ACCEPT udp -- eth1 any anywhere ns.node1.com udp dpt:domain 0 0 ACCEPT tcp -- eth1 any anywhere ns.node1.com tcp dpt:domain 0 0 ACCEPT all -- eth0 any node2.backend anywhere 21 1260 ACCEPT all -- eth0 any node3.backend anywhere 0 0 ACCEPT all -- eth0 any node4.backend anywhere Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 15804 packets, 26M bytes) pkts bytes target prot opt in out source destination nmap -sV -p 53 ns.node1.com // From remote server Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2011-02-24 11:44 EST Interesting ports on ns.node1.com (1.2.3.4): PORT STATE SERVICE VERSION 53/tcp filtered domain Nmap finished: 1 IP address (1 host up) scanned in 0.336 seconds Any ideas? Thanks

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• Good speedtest results, but web pages don't load

  - by dmt0

  I have strange connection problems. Ping and download times are good - speedtest.net showed ping 65ms and download 2.17Mbps. Torrent is working well, giving me up to 300MBps. Webpages are loading very poorly though. They are timing out each time - I'd have to refresh 4-5 times to get any simple page to load. It has been happening consistently for the last few days. Same with different browsers on different machines (same network), Windows and Linux. There is no proxy in the browser. Is there any setting in Windows or in a browser that I can change to help this? Some background: I live on this island in Thailand, where internet connection is through radio to another island and than to mainland - it's very weather dependent, but generally OK. As I mentioned, ping is good. Any input is very appreciated.

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• Is embedded programming closer to electrical engineering or software development?

  - by Jeremy Heiler

  I am being approached with a job for writing embedded C on micro controllers. At first I would have thought that embedding programming is to low on the software stack for me, but maybe I am thinking about it wrong. Normally I would have shrugged off an opportunity to write embedded code, as I don't consider myself an electrical engineer. Is this a bad assumption? Am I able to write interesting and useful software for embedded systems, or will I kick myself for dropping too low on the software stack? I went to school for computer science and really enjoyed writing a compiler, managing concurrent algorithms, designing data structures, and developing frameworks. However, I am currently employed as a Flex developer, which doesn't scream the interesting things I just described. (I currently deal with issues like: "this check box needs to be 4 pixels to the left" and "this date is formatted wrong".) I appreciate everyone's input. I know I have to make the decision for myself, I just would like some clarification on what it means to be a embedded programmer, and if it fits what I find to be interesting.

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• Startup script for Windows Recovery Environment?

  - by Recovery

  I'm trying to automate the Windows 7 Recovery Environment. I want the computer to be able to boot into the Recovery Environment, automatically run some commands, and then restart back into Windows. The reason for this is that I want to use the Recovery Environment to edit some system files that are not writable while Windows is running. (Of course, this could be done using GRUB and Linux, but it would be even better if one could use the built-in Windows Recovery Environment and avoid the need to install a separate bootloader and OS.) So far, I've found out how to tell Windows 7 to reboot into the recovery environment: reagentc /boottore shutdown /r /t 0 But once the Recovery Environment loads, it opens a dialog that requires user input to continue. Instead of that dialog, I would like to be able to specify a script to run instead. Any ideas on how to accomplish this would be appreciated. Thanks!

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• Cannot use `su` or `sudo` after set up key-based access to SSH

  - by OrangeTux

  I'm following this tuturial to setup key-based access to the SSH I created a user. I add copy the key to the client via ssh-copy-id <username>@<host> Becasuse ssh <username>@<host> still prompts for a password I run ssh-add on the local machine. The terminal doens't prompt for a password, I can login without using a password. But I cannot run su anymore. Every input for the password results in Authentication failure. I tried it again. But before coping the key, I added to the sudoer file. Copied key, ssh-add. But now I cannot login to my SSH shell att all? How can I setup a key-based SSH access with the possibiluty to use su or sudo?

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• Network Monitoring Tool Recommendation

  - by user42801

  Hello, My company is looking for a monitoring app/tool that would allow us to capture and graph statistics on network performance. As a starting point, we would like to ping remote host(s) and gateway(s) from several of our servers, grab an average of the ping times from each of our servers to the remote host(s), and then graph it (preferably in a central location). Also, we would like to be able to graph the results for time frames as short as a week to as long as 6 months. It is reasonable to expect that we would ask more of the selected monitoring app/tool as we come up with other key network performance indicators in the future. So an app with great flexibility and features would be ideal. Upon first glance, Cacti looks like it might be a fit. Any other recommendations? Thanks in advance for any input.

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• Lazy Processing of Streams

  - by Giorgio

  I have the following problem scenario: I have a text file and I have to read it and split it into lines. Some lines might need to be dropped (according to criteria that are not fixed). The lines that are not dropped must be parsed into some predefined records. Records that are not valid must be dropped. Duplicate records may exist and, in such a case, they are consecutive. If duplicate / multiple records exist, only one item should be kept. The remaining records should be grouped according to the value contained in one field; all records belonging to the same group appear one after another (e.g. AAAABBBBCCDEEEFF and so on). The records of each group should be numbered (1, 2, 3, 4, ...). For each group the numbering starts from 1. The records must then be saved somewhere / consumed in the same order as they were produced. I have to implement this in Java or C++. My first idea was to define functions / methods like: One method to get all the lines from the file. One method to filter out the unwanted lines. One method to parse the filtered lines into valid records. One method to remove duplicate records. One method to group records and number them. The problem is that the data I am going to read can be too big and might not fit into main memory: so I cannot just construct all these lists and apply my functions one after the other. On the other hand, I think I do not need to fit all the data in main memory at once because once a record has been consumed all its underlying data (basically the lines of text between the previous record and the current record, and the record itself) can be disposed of. With the little knowledge I have of Haskell I have immediately thought about some kind of lazy evaluation, in which instead of applying functions to lists that have been completely computed, I have different streams of data that are built on top of each other and, at each moment, only the needed portion of each stream is materialized in main memory. But I have to implement this in Java or C++. So my question is which design pattern or other technique can allow me to implement this lazy processing of streams in one of these languages.

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• I/O redirection using cygwin and mingw

  - by KLee1

  I have written a program in C and have compiled it using MinGW. When I try to run that program in Cygwin, it seems to behave normally (i.e. prints correct output etc.) However, I'm trying to pipe output to a program so that I can parse information from the program's output. However, the piping does not seem to be working in that I am not getting any input into the second program. I have confirmed this by using the following commands: This command seems to work fine: ./prog Performing this command returns nothing: ./prog | cat This command verifies the first: ./prog | wc Which returns: 0 0 0 I know that the script (including the piping from the program) works perfectly fine in an all Linux environment. Does anyone have any idea for why the piping isn't working in Cygwin? Thanks!

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• How to Program AWS Spot Instances to Strategically Bid So the Auction is Never Lost Until a Competitor Beats the Maximum I'm Willing to Pay?

  - by Taal

  I believe I'm in the right section of stack exchange to ask this. If not, let me know. I only use Amazon Web Services for temporary type hosting services, so the spot instances are quite valuable to me. I would also just make an instance and start and stop it - but - that doesn't necessarily fit my bootstrapped budget sadly. Anyways, it really kills me when someone outbids me on a spot instance I have (I tend to go for the larger ones which there are fewer of available) and I get randomly kicked off. I know or at least I believe there is a way to program in something somehow to dynamically change your bidding price to beat a potential competitor's if their's is higher than yours. Now, I previously believed Amazon would just charge me for the highest price right above the next lowest competitor automatically (eliminating the need for this) - so if I bid too high, then I only pay what I would of needed to in order to win and keep the auction. Essentially, I thought my bid price was my max bid price. Apparently, according to my bills and several experiments I've done - this is not the case. They charge me for whatever I bid even when I know there is no one else around to counter bid me. I needed to clarify that, but let me get back to the main point: Let's say I'm bidding $0.50, competitor comes in and bids 0.55 cents. I get kicked off. I want to have it to where I'd set a maximum I'm willing to pay (let's say $1.00 here), and then when competitor comes in and tries to bid $.55, my bid is dynamically adjusted to beat his at $0.56 up until he breaks my $1.00 threshold. I've been reading the guides and although they are more or less straightforward, I feel like they leave a few holes in them that end up confusing me. Like, for instance, where do I input said command or when do I do it? Maybe I'm just tech illiterate and need help deciphering these guides. A good start for someone willing to answer/help me decipher this problem would be here: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-as-update-bid.html

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• How to configure a Logitech USB headset on Fedora 14 [closed]

  - by Humble Debugger

  I have a Logitech USB headset http://www.amazon.com/gp/product/B003NREDG4 but I can't hear anything nor input anything through it. I am working on a Fedora 14 desktop. cat /proc/asound/cards 0 [Intel ]: HDA-Intel - HDA Intel HDA Intel at 0xfebdc000 irq 51 2 [Headset ]: USB-Audio - Logitech USB Headset Logitech Logitech USB Headset at usb-0000:00:1d.0-2, full speed /sbin/lsmod | grep -c snd 14 lsusb Bus 008 Device 002: ID 046d:c529 Logitech, Inc. Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 004: ID 046d:0a0b Logitech, Inc. ClearChat Pro USB Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Please advise

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• Any way to release focus on a KVM guest in virt-manager without having to click Ctrl_L + Alt_L?

  - by slm

  Is there a way to move my mouse in and out of a KVM guest in virt-manager without having to click to gain focus of the window and release focus by pressing Ctrl_L + Alt_L? EDIT #1 The guest VM is Win2008R2. I've tried this on a CentOS 5, 6, and Fedora 14 box running various versions of virt-manager and KVM and they all exhibit this behavior. EDIT #2 I just tried the solution recommended by @tpow and that appears to be the issue. Manually adding a tablet input device resolves the problem and I can now move the mouse in and out of the KVM guest without having to gain focus first.

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• Javascript storing data

  - by user985482

  Hi I am a beginner web developer and am trying to build the interface of a simple e-commerce site as a personal project.The site has multiple pages with checkboxes.When someone checks an element it retrives the price of the element and stores it in a variable.But when I go to the next page and click on new checkboxes products the variable automaticly resets to its original state.How can I save the value of that variable in Javascript? This is the code I've writen using sessionStorage but it still dosen't work when I move to next page the value is reseted. How can I wright this code so that i dosen't reset on each page change.All pages on my website use the same script. $(document).ready(function(){ var total = 0; $('input.check').click(function(){ if($(this).attr('checked')){ var check = parseInt($(this).parent().children('span').text().substr(1 , 3)); total+=check; sessionStorage.var_name=0 + total; alert(sessionStorage.var_name); }else{ var uncheck = parseInt($(this).parent().children('span').text().substr(1 , 3)); total-=uncheck; } })

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• Question about modeling with MVC (the pattern, not the MS stuff / non web)

  - by paul

  I'm working on an application in which I'm looking to employ the MVC pattern, but I've come up against a design decision point I could use some help with. My application is going to deal with the design of state-machines. Currently the MVC model holds information about the machine's states, inputs, outputs, etc. The view is going to show a diagram for the machine, graphically allowing the user to add new states, establish transitions, and put the states in a pleasing arrangement, among other things. I would like to store part of the diagram's state (e.g. the x and y state positions) when the machine information is stored for later retrieval, and am wondering how best to go about structuring the model(s?) for this. It seems like this UI information is more closely related to the view than to the state-machine model, so I was thinking that a secondary model might be in order, but I am reluctant to pursue this route because of the added complexity. Adding this information to the current model doesn't seem the right way to go about it either. This is the my first time using the MVC pattern so I'm still figuring things out. Any input would be appreciated.

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• Viewsonic Monitor Resolution - Drivers are not working

  - by ravidev

  I have Viewsonic va1716w monitor which has VGA/D-SUB video input. I bought new Motherboard Intel DH67GD which has HDMI & DVI output. I connect my motherboard to monitor using DVI to VGA connector. It's working. Yesterday I installed windows 7 OS and also installed monitor drivers(downloaded from viewsonic site - signed version) When i set display resolution to 1440 x 900. It's not setting it.it sets back to 800x600. What should i do to make resolution to 1440x900 (monitor resolution)? DVI to VGA causing this problem or i need to do any trick? Any link to download drivers Please guide me.. Thanks in advance !!

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• Remotely running batches on a Windows PC

  - by Eduardo León

  I want to remotely control my home desktop PC (running Windows 7 Professional), mainly to perform the following tasks: Downloading email attachments, and sending emails with attachments Running UI-less programs whose only inputs are files and whose only outputs are files So far, the only solution I have found is to use Remote Desktop to connect to my PC, but this is very slow and inefficient, especially when there is no fast Internet connection available other than my cell phone's. I would like to be able to send batch commands to my PC, like: Download an email attachment Use it as input for an UI-less program Save the program's output to a file Send that file to myself as an email attachment Is this possible? How could I do it?

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• Is IDirectInput8::FindDevice totally broken on Windows 7?

  - by Noora

  I'm developing on Windows 7, and using DirectInput8 for my input needs. I'm tracking gamepad additions and removals (that is, GUID_DEVINTERFACE_HID devices) using the DBT_DEVICEARRIVAL and DBT_DEVICEREMOVECOMPLETE messages, which works fine. However, what I've come to find out is that no matter what I do, passing the received values from DBT_DEVICEARRIVAL to IDirectInput8's FindDevice method, it will always fail to identify the device, returning DIERR_DEVICENOTREG. DirectInput still clearly knows about the device, because I can enumerate and create it just fine. I've tried with three different gamepads, and the error persists, so it's not about that either. I also tried passing some alternative interface GUIDs for the RegisterDeviceNotification call, didn't help. So, has anyone else faced the same problem, and have you found a usable workaround? I'm afraid I'll soon have to stoop down to re-enumerating all devices when something is added or removed, but I'll first give this question one last shot here. EDIT: For the record, I've also tried pretty much every single HID API & SetupAPI function for alternative ways of figuring out the needed GUIDs, with zero success. So if you're facing the same problem as me, don't bother with that route. I'm pretty sure those GUIDs are made up by DirectInput itself somehow. Short of reverse engineering dinput8.dll, I'm truly out of ideas now.

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• Ubuntu 9.10 freezes when HDMI port is connected

  - by Felipe Hummel

  I have a Sony Vaio FW350 with a HDMI output. I'm trying to use it under Ubuntu 9.10 with a LG LCD monitor 21,5'. The laptop has a Intel 4500 video card. I've tried two approaches: Boot the laptop with the HDMI cable connected and monitor turned on. Result: LCD Monitor keeps turned on but the whole screen is black and Ubuntu do not seem to be initializing. Boot Ubuntu until the end. I then connect the HDMI cable into the Laptop. The mouse and the whole system freezes. In both cases the only way to turn off the laptop is holding the power button. I've looked around the internet for similar problems, but only found workarounds for the same problem with VGA input, not HDMI. I also tried to use metacity before connecting the cable, but still got the same result. Any hints?

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• The type of programmer I want to be [closed]

  - by Aventinus_

  I'm an undergraduate Software Engineer student, although I've decided that pure programming is what I want to do for the rest of my life. The thing is that programming is a vast field and although most of its aspects are extremely interesting, soon or later I'll have to choose one (?) to focus on. I have several ideas on small projects I'd like to develop this summer, having in mind that this will gain me some experience and, in the best scenario, some cash. But the most important reason I'd like to develop something close to “professional” is to give myself direction on what I want to do as a programmer. One path is that of the Web Programmer. I enjoy PHP and MySQL, as well as HTML and CSS, although I don't really like ASP.NET. I can see myself writing web apps, using the above technologies, as well as XML and Javascript. I also have a neat idea on a Facebook app. The other path is that of the Desktop Programmer. This is a little more complicated cause I really-really enjoy high level languages such as Java and Python but not the low level ones, such as C. I use both Linux and Windows for the last 6 years and I like their latest DEs (meaning Gnome Shell and Metro). I can see myself writing desktop applications for both OSs as long as it means high level programming. Ideally I'd like being able to help the development of GNOME. The last path that interests me is the path of the Smartphone Programmer. I have created some sample applications on Android and due to Java I found it a quite interesting experience. I can also see myself as an independent smartphone developer. These 3 paths seem equally interesting at the moment due to the shallowness of my experience, I guess. I know that I should spend time with all of them and then choose the right one for me but I'd like to know what are the pros and cons in terms of learning curve, fun, job finding and of course financial rewards with each of these paths. I have fair or basic understanding of the languages/technologies I described earlier and this question will help me choose where to focus, at least for now.

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• PHP and MySQL related Problem

  - by Tareq

  Hi friends, I have a local LAN to my office. Recently I designed a New Software system using PHP, MySQL for my office. My boss wants to see the reports from online. My problem is, my network connection is often failed to my office. But I have to input all time. So, now I want to use two instances of my software. One will be using the LAN and one will be uploaded to my server. My question is, how can I easily keep the both databases up-to-date always? Please help me with this issue. If you want more info please feel free to ask me.

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• How to run scripts within a telnet session?

  - by wenzi

  I want to connect to a remote host using telnet there is no username/password verification just telnet remotehost then I need to input some commands for initialization and then I need to repeat the following commands: cmd argument argument is read from a local file, in this file there are many lines, each line is a argument and after runing one "cmd argument", the remote host will output some results it may output a line with string "OK" or output many lines, one of which is with string "ERROR" and I need to do something according to the results. basically, the script is like: initialization_cmd #some initial comands while read line do cmd $line #here the remote host will output results, how can I put the results into a variable? # here I want to judge the results, like if $results contain "OK";then echo $line >>good_result_log else echo $line >> bad_result_log fi done < local_file the good_result_log and bad_result_log are local files is it possible or not? thanks! NOTE: I can't control B, I can only run initial cmds and cmd $line on B

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• rename multiple files with unique name

  - by psaima

  I have a tab-delimited list of hundreds of names in the following format old_name new_name apple orange yellow blue All of my files have unique names and end with *.txt extension and these are in the same directory. I want to write a script that will rename the files by reading my list. So apple.txt should be renamed as orange.txt. I have searched around but I couldn't find a quick way to do this.I can change one file at a time with 'rename' or using perl "perl -p -i -e ’s///g’ *.txt", and few files with sed, but I don't know how I can use my list as input and write a shell script to make the changes for all files in a directory. I don't want to write hundreds of rename command for all files in a shell script. Any suggestions will be most welcome!

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• forward all ports via htaccess to new address

  - by user875933

  I have a chat server running on my local machine that listens to different ports. I want to use the sub-domain of one of my accounts to access it. I intend to manually change the redirect whenever my local machine gets a different ip address. So: chat.example.com:123 would redirect to dynamic.ip.address:123 I am trying to accomplish this with .htaccess and RewriteRule I have tried: RewriteEngine on RewriteRule ^(.*) http://dynamic.ip.address/ [L, R=302] but this doesn't work. When I try chat.example.com:123 nothing happens. When I input chat.example.com into the web browser, I get dynamic.ip.address Is .htaccess the right tool for this? I am using a simple web host that gives me ssh access, but not much more.

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• M-Audio Delta 1010LT on 12.04

  - by user74039

  I have 12.04 64bit installed, my soundcard is a Delta 1010LT, it seems to be partially detected, I've been following steps here: https://help.ubuntu.com/community/SoundTroubleshooting/ lspci -v | grep -A7 -i "audio" shows this: 04:07.0 Multimedia audio controller: VIA Technologies Inc. ICE1712 [Envy24] PCI Multi-Channel I/O Controller (rev 02) Subsystem: VIA Technologies Inc. M-Audio Delta 1010LT Flags: bus master, medium devsel, latency 64, IRQ 22 I/O ports at ec00 [size=32] I/O ports at e880 [size=16] I/O ports at e800 [size=16] I/O ports at e480 [size=64] Capabilities: <access denied> Kernel driver in use: snd_ice1712 aplay shows this: **** List of PLAYBACK Hardware Devices **** card 0: M1010LT [M Audio Delta 1010LT], device 0: ICE1712 multi [ICE1712 multi] Subdevices: 1/1 Subdevice #0: subdevice #0 In the sound settings on the desktop all I see is the ICE1712 S/PDIF, which I don't use, I want to use the individual outputs on the card, I'm not so bothered about inputs, I just want the playback for now. If I open alsamixer in the console, I see all of the output and input channels, i've raised the volume on them but I don't get anything in the sound settings on the desktop and when I play any sound, I hear nothing. Can someone help?

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• What is the value of checking in failing unit tests?

  - by user20194

  While there are ways of keeping unit tests from being executed, what is the value of checking in failing unit tests? I will use a simple example: Case Sensitivity. The current code is case sensitive. A valid input into the method is "Cat" and it would return an enum of Animal.Cat. However, the desired functionality of the method should not be case sensitive. So if the method described was passed "cat" it could possibly return something like Animal.Null instead of Animal.Cat and the unit test would fail. Though a simple code change would make this work, a more complex issue may take weeks to fix, but identifying the bug with a unit test could be a less complex task. The application currently being analyzed has 4 years of code that "works". However, recent discussions regarding unit tests have found flaws in the code. Some just need explicit implementation documentation (ex. case sensitive or not), or code that does not execute the bug based on how it is currently called. But unit tests can be created executing specific scenarios that will cause the bug to be seen and are valid inputs. What is the value of checking in unit tests that exercise the bug until someone can get around to fixing the code? Should this unit test be flagged with ignore, priority, category etc, to determine whether a build was successful based on tests executed? Eventually the unit test should be created to execute the code once someone fixes it. On one hand it shows that identified bugs have not been fixed. On the other, there could be hundreds of failed unit tests showing up in the logs and weeding through the ones that should fail vs. failures due to a code check-in would be difficult to find.

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