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• Convert old videos to have smaller sizes

  - by Tim

  I have some videos from a few years ago,with various formats, such as avi, mpg, wmv, rm, rmvb, .... Their sizes are huge(more than 500 MB, and sometimes 1GB). Given there may likely be some advance in data compression, I would like to know which file formats and compression methods are recommended these days, by the standard that without losing obvious data, while achieving big size reduction. How can I perform the file format conversion and data compression in Ubuntu 12.04? Command line and batch ways would be the most convenient, although GUI ways are also appreciated. Thanks and regards!

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• Why does my drive show as 180GB used, but copies only 40GB?

  - by Manuel

  My computer crashed, so I removed the drive (with Windows XP Professional 32-Bit) and put this drive in another computer running Windows 7 64-bit. Booting with Win7, when going to My Computer it is showing the XP drive as more than 180GB used. So as a quick backup, I'm trying to copy all the disk's content to a folder, but when I start copying, it's showing only 40 GB as the total size of the files to copy. I enabled showing system and hidden files in View options. What could be the problem?

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• Gentoo+urxvt+terminus: How do I change font version?

  - by gaidal

  In my Debian installation I can type extended ASCII characters such as åäö by default using the terminus font, however in Gentoo I can't get it to work so far. Nothing happens when I hit those keys, like in this thread: Missing glyphs in Terminus font, how to setup a fallback font ? But in this case I know terminus supports those characters in at least some of its versions, since it's works in Debian. So what I want is to find out how to see and choose which of the many different terminus font files is being used. I set the font in the same way on both Debian and Gentoo, using URxvt*font: xft:terminus:size=xx in .Xdefaults. Both systems use en_US.UTF-8 as default locale.

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• Unable to mount Amazon Public Dataset using ec2-create-volume

  - by the0ther

  I am trying to use a Public Dataset with the snapshot id of snap-­e1608d88. I am looking at these instructions, but they do not seem to help. The first suggestion there says I should click on Volumes and create a new volume, set it's size and availability zone, as well as specifying the snapshot id. The problem is, snapshot id is a dropdown, not a text field, and there are over 100 options in the dropdown. Next I installed the ec2 command line tools and tried to run the ec2-create-volume command. For my first attempt I tried ec2-create-volume --snapshot snap-­e1608d88 --availability-zone us-east-1 but that gave output indicating I need to provide a certificate with the --cert switch. Which certficate exactly? I tried my SSH cert at ~/.ssh/id_rsa. No dice. I got the following Java error: "org.codehaus.xfire.fault.XFireFault: General security error;"

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• ZFS Configuration advice

  - by rbarrette

  I need some advice on configuring ZFS. Here is what I have: Physical Disks: 4x 3 TB 2x 2 TB 2x 1 TB What is the best configuration for my Vdevs and storage pool. I want to maximaze space but still maintain redundancy. Should I just get 2 more 3TB's and just create 2x 3-3TB raid2z storage pools? Create a 1x 4-3TB raidz2 vdev? Can I put redundancy at the pool level and create individual vdevs for each drive and then add 2x 1TB+2TB striped vdevs to keep all vdevs the same size. Keep in mind I do need to migrate data from the smaller drives and am planning on adding more 3tb drives later on. What do you think?

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• Firefox Wordwrap

  - by AtlantaBill

  The text displayed in several, forum sites that I frequently visit does not automatically word wrap in Firefox's window. Rather, it just "runs off" the right end of the window. I can cause the text to properly word-wrap by maximizing the window and then immediately returning it to its normal size. This lasts until I move to another page and then I have to repeat this "work-around" to display word-wrapped text properly again. Anyone have any ideas on what I can do to make Firefox always automatically word-wrap text? TIA. Bill

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• How to quickly search through a very large list of strings / records on a database

  - by Giorgio

  I have the following problem: I have a database containing more than 2 million records. Each record has a string field X and I want to display a list of records for which field X contains a certain string. Each record is about 500 bytes in size. To make it more concrete: in the GUI of my application I have a text field where I can enter a string. Above the text field I have a table displaying the (first N, e.g. 100) records that match the string in the text field. When I type or delete one character in the text field, the table content must be updated on the fly. I wonder if there is an efficient way of doing this using appropriate index structures and / or caching. As explained above, I only want to display the first N items that match the query. Therefore, for N small enough, it should not be a big issue loading the matching items from the database. Besides, caching items in main memory can make retrieval faster. I think the main problem is how to find the matching items quickly, given the pattern string. Can I rely on some DBMS facilities, or do I have to build some in-memory index myself? Any ideas? EDIT I have run a first experiment. I have split the records into different text files (at most 200 records per file) and put the files in different directories (I used the content of one data field to determine the directory tree). I end up with about 50000 files in about 40000 directories. I have then run Lucene to index the files. Searching for a string with the Lucene demo program is pretty fast. Splitting and indexing took a few minutes: this is totally acceptable for me because it is a static data set that I want to query. The next step is to integrate Lucene in the main program and use the hits returned by Lucene to load the relevant records into main memory.

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• ubuntu live cd start up error

  - by Emiel

  First off, I'm new to the Linux scene. This is my first attempt to make a single boot installation for Ubuntu. I tried it for a few days in dual boot with win7 and I was sold, so i removed the tumor my pc had to endure for so long (sorry laptop) and installed Ubuntu from an usb boot device. My dual boot was as follows: Windows 7 was installed on partition C from hdd1, the windows installer for Ubuntu installed Ubuntu on partition I on that same hdd, hdd1. In the live cd installation I did the normal execution for removing windows and it said that after the installation my partition would be 320gb big, that is the total size of my hdd, so I automatically assumed that it would format my whole hdd. Now the installation has completed and it tells me to restart my system, and here comes the problem: now I get a dashing white cursor on my screen after the BIOS load and it won't budge... it just stands there and it doesn't move on or load Ubuntu, the system gets very hot at this point... Then I tried to reinstall using the same live CD, it is still on my USB drive, but when I boot from the USB, I get the error: no such file with some address and the a grub rescue. What to do? I can get hold of a win7 copy, but I don't really want to use that crap again... Thanks for helping me out. Kind regards, Emiel

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• TCP 30 small packets per second flood connection with server

  - by Denis Ermolin

  I'm testing connection with flash client and cloud server(boost::asio for software) over TCP connection. My connection with server already is really poor - 120 ms ping in average. I found when i start to send packets with 2 bytes size (without tcp header) with speed 30 packets/s - ping grow to 170-200 average. I think that it's really bad and my bad connection and bad cloud provider is reason for this high ping without any load. What do you think? (I tested my software - it can compute about 50k small packets/s so software is not a problem). I measure my ping through flash client - send packet with timestamp and immediatly send from server to client.

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• Sending a large number of mails causing problems on CentOS 6 / Plesk 10

  - by papakost

  I have a VPS running CentOS 6. When the system tries to send daily newsletter, after some time (e.g. after sending about 2000 emails), I get error "Unable to send mail" and the system memory goes really high. Till this moment, the mails are delivered normally. The rest symptoms are: I cannot see anything on /var/log/maillog (File seems not to be written) All files on /var/spool/mail have 0 bytes size. From time to time on httpd log I get errors like: /usr/sbin/sendmail: error while loading shared libraries: libc.so.6: cannot open shared object file: Error 23 "Activate mail service on domain" setting in Plesk is deactivated. Any idea on what's going wrong here?

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• df-h command in ubuntu

  - by Esha Sharma

  I am a new user of Ubuntu. When I type df -h in terminal , it gives me list of all storage devices and space usage. In my system I get this. Filesystem Size Used Avail Use% Mounted on /cow 934M 173M 761M 19% / udev 925M 4.0K 925M 1% /dev tmpfs 374M 856K 373M 1% /run /dev/sdb1 7.5G 2.8G 4.8G 37% /cdrom /dev/loop0 1.5G 1.5G 0 100% /rofs tmpfs 934M 16K 934M 1% /tmp none 5.0M 0 5.0M 0% /run/lock none 934M 76K 934M 1% /run/shm /dev/sda 299G 74M 299G 1% /media/q I understand that /dev/sda is my hard drive which is 320 gb(in gib it is 299 and hopefully that is what is being displayed) and /dev/sdb1 is pendrive of 8gb from which I am running the live cd. My question is what are the other folders and what is the physical location of these folders if complete memory is taken by the device dev/sda?

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• XAMPP Closes the connection

  - by Miro Markarian

  I want my XAMPP Apache server to host a file (The file is around 250mb) but the server closes the connection and won't let me download the file? Does xampp or apache have any download size limit or something? Tested with a smaller file , the problem is still present. It just doesn't let me download any file from the server.!!! All I get in the error log is this: Fri Sep 07 23:21:31.742625 2012] [authz_core:debug] [pid 3664:tid 396] mod_authz_core.c(808): [client x.x.x.x:23409] AH01628: authorization result: granted (no directives), referer: http://ammiprox.tk/greeneyes2910/

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• Problem with fitting graphics card

  - by Gary Robinson

  I have recently purchased a new radeon hd5670 graphics card. The problem I have is that it is what I might call a double height card. So the end where you fix the card to the case is twice the size of the card it is replacing. But this means that it is blocked by the rear of the network card. The only way I can see it to cut that part of the fixture part out then I won't have a problem. But has anyone any suggestions what I could use? To be clear it is not the actual card it is the fixture part which is 90 degress to the card that is causing the problem. Unless someone knows of another solution - some kind of pci-e extender that I could use as I could easily

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• windows print service

  - by user1631171

  Hi my college has a HP color printer that can be used to print both A3 and A4 size color printouts. It is connected to a windows 2008 print server. The windows event viewer provides the status of printouts using event id 307. I would like to know if it is possible to find out if an A3 page was printed or A4 page was printed. Is this information also logged in windows event viewer. Or is there any other event id that captures this information. Also the number of copies printed should be captured in event id 805. I have read in some forums that sometimes the value is wrong. Please provide me some information on this. Thanks in advance.

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• 3 Headed Display Ubuntu Wallpaper

  - by Kyle Brandt

  I got 3 display working in Linux. I have set it up so I have Xinerama and 3 different X sessions. So my 3 displays are not all the same size, two are 1680x1050 and then the other which is between the two is 2560x1600. So my issue is when I chose span, even if the image is larger than all 3 resolutions combined, the center monitor has bars at the top and the bottom because span scales the image it seems. Is there a way if I bypass the gui to have an image span all three monitors but with no scaling? Urgent! Please help! ;-)

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• Tools for tracking disk usage

  - by Carey

  I manage a number of linux fileservers. These all run applications written from 0-10 years ago. As sometimes happens, a machine will come close to, or run out of disk space. Reasons include applications not rotating log files, a machine with 500GB of disk producing 150GB of new files every month that were not written to tape, databases gradually increasing in size, people doing silly things...generally a bit of chaos. Anyway, when a machine unexpectedly goes from 50% to 100% full in a couple of hours, I figure out what broke (lots of "du") and delete files or contact someone. I also can look at cacti graphs to figure out what the machine's normal disk usage is (e.g. for /home). Does anyone know of any tools that will give finer grained information on historial usage than a cacti/RRD graph? Like "/home/abc/xyz increased 50GB in the last day".

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• When I plug an HDMI cable into my MacBook Pro with Retina Display, the resolution of the retina display changes

  - by Tyler Crompton

  I had an HDMI cable plugged in for a while that connected to a TV with no power. The retina display randomly flashed blue after a while and then changed to a different resolution (possibly 1080p). I unplugged the HDMI cable and nothing happened. So I restarted the computer to no avail. I was still having issues. So I fiddle with some settings after plugging in the HDMI cable again. Now, the retina display appears fine when no HDMI cable is plugged in, but when there is one plugged in, the resolution changes. I have mirroring turned off (which is what I want). The resolution of the retina display when an HDMI cable is plugged in is 3,360px x 2,100px (according to the size of a screenshot) and the external display is 1,600px is 900px. How can I fix the retina display to show with the correct resolution.

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• How is the 137GB limit counted in Virtual PC (two systems on one disk)?

  - by Nux

  I have a dual boot (Win7, XP) physical machine on my old computer which I want to virtualize and move to my new one. So I've uninstalled everything that I can and run shrink from RescueCD (used GParted). Now I have two about 80GiB partitions with a gap between them, so still this seem to be above the given limit. Still the resulting VHD (made with Disk2vhd) is much below the limit (about 110GiB) and both partitions are below the limit. So my question is - is it failing due to the limitations of disk size for VPC or is failing simply because it's a dual boot system. Or maybe it would work if I would move partitions to be close to each other (the gap between them is about 171GB and the whole physical disk is 1TB)?

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• Small font all 'new' messages suddenly in Gmail on Ubuntu in Opera, why?

  - by Michael Durrant

  This seemed to happen out of the blue. I have been using Opera for years. I can't find anywhere in Gmail to change the default font that is used in Opera. Ubuntu is Version 11 Opera is version 11.6 In Firefox the font is normal size. I have tried playing around with both all the browser setting I can find plus Ubuntu system settings (I had seen some mentions of Opera using the system default font sometimes) but no success so far. Really bumming as I have been using Opera for two years and if I can't resolve it I will not be able to use it. I can switch to Firefox but I don't want to.

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• How to recover missing folders in a Windows-Ubuntu dual-boot system?

  - by UnhappyGhost

  I have Windows 7 and Ubuntu 12.04 as dual-boot and on the same 500GB HDD. I have partitioned the drive into NTFS file system from Windows before I installed Edubuntu 12.04 in the remaining free space. Now, there is a drive(G:) accessible through Windows and has few folders. I boot into Edubuntu and create a folder "LinTor" and download movies and few software from torrentz. Before I download, it showed 49GB free out of 62GB. After all the downloads it showed 31GB free out of 62GB. Then I boot into Windows and I couldn't find this "LinTor" folder. I wondered that might be happening as I hibernate Edubuntu (using sudo pm-hibernate) and then boot into Windows. I then create another folder in the same drive(G:) with the name "001" to check if this was accessible from Edubuntu. Now I reboot into Edubuntu to find that "LinTor" folder has disappeared and "001" folder wasn't showing up either. Surprisingly, the drive size still shows 31GB free out of 62GB but when I check it from Windows, it shows 49GB free of 62GB. There is one thing I would like to mention. When I was trying to unmount the NTFS drive(G:) from Edubuntu before booting into Windows, it prompted me with this message: Do you want to empty the trash before you unmount the drive? Once the trash is emptied the data is permanently deleted and cannot be recovered. Please help me understand what could be the problem and how do I recover the missing folder?

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• Win 8 start screen resolution

  - by Abhijith

  My screen resolution is 1280x1024 running Win 8 RP I formatted my computer and reinstalled Win 8 CP because I had too many BSODs. When I installed Win 8 CP and created a local account. I had 5(or 6) tiles per column. But once I switched to the Microsoft account to get my synced wallpaper and lock-screen, the Start screen resolution changed and I got a max 3 tiles per column. The size of all metro apps including the Settings app changed and became awkwardly bigger. Is there a way to get back 5 tiles per column? Essentially changing the resolution of the start screen?

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• Hadoop Rolling Small files

  - by Arenstar

  I am running Hadoop on a project and need a suggestion. Generally by default Hadoop has a "block size" of around 64mb.. There is also a suggestion to not use many/small files.. I am currently having very very very small files being put into HDFS due to the application design of flume.. The problem is, that Hadoop <= 0.20 cannot append to files, whereby i have too many files for my map-reduce to function efficiently.. There must be a correct way to simply roll/merge roughly 100 files into one.. Therefore Hadoop is effectively reading 1 large file instead of 10 Any Suggestions??

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• How to choose NoSQL database engine?

  - by Poma

  We have a database with following specs: 30k records, 7mb in size 20 inserts/second 1000 updates/second 1000 range selects/second, by secondary index, approx 10 rows each needs at least one secondary index needs some mechanism to expire keys if they are not updated for 75 secs (can be done via programmatic garbage collector but will require additional 'last_update' index and will add some load) consistency is not required durability is not required db should be stored in memory For now we use Redis, but it does not have secondary index and it's keys index:foo:* is too slow. Membase also does not have secondary index (as far as I know). MongoDB and MySQL memory engine have table-level locks. What engine will fit our use case?

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• Is there a way to increase how much is cached for thumbnail views of pictures?

  - by JimDel

  Is there a way to increase how much is cached for thumbnail views of pictures? If I'm looking through a folder of .png files for example, with "medium" set as the view size. The screen will eventually fill all the thumbnails with the appropriate pictures. But as I scroll down it takes a while for the pictures to fill in again. I would like a way for "off screen" pictures to fill in before I get the that section of the screen. Is there a way to do this? Thanks

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• Syncing Large Directories/Filesystems using USB Drive

  - by Alan Lue

  Does anyone have a solution for syncing large directories/filesystems using just a USB flash drive (and specifically without using a network connection)? The objective is simply to sync a user directory between two computers. The contents of the user directory could amount to a large quantity of data—say, a quantity larger than could be stored on any single USB drive—but the aggregate size of changes that must be propagated by a single sync could easily fit on a USB drive. As an example, suppose a user directory is already synchronized between a desktop and a laptop computer. Here's a use case: Some changes are made in the user directory on the desktop. We mount a USB drive onto the desktop and copy whatever changes need to be applied to the laptop user directory in order to synchronize the desktop and laptop user directories. We now mount the USB drive onto the laptop and apply the changes. The desktop and laptop user directories are now synchronized. Any ideas? Alan

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