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  • Single line command/script to archive a certain amount of folders

    - by EarthMind
    I'm looking for a single line command or a script that archives 5 folders into .tar files (no gzip/bzip needed) in a certain directory and deletes the folders after a successful compression. It has to use the original folder name as file name for the archive too. So far I've used the current command, which only does one directory per time: tar -c directory > directory.tar && rm -rf directory Thanks in advance.

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  • Single line command to archive a certain amount of folders

    - by EarthMind
    I'm looking for a single line command that archives 5 folders into .tar files (no gzip/bzip needed) in a certain directory and deletes the folders after a successful compression. It has to use the original folder name as file name for the archive too. So far I've used the current command, which only does one directory per time: tar -c directory > directory.tar && rm -rf directory Thanks in advance.

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  • Experiences with eXdupe?

    - by ewwhite
    I noticed that the eXdupe compression/archiving/deduplication utility was recently mentioned in another post here. It boasts some interesting features, and I've been playing with it for the past day. It's basically a cross-platform, highly multithreaded archival tool. http://exdupe.com/index.html I'm curious if anyone here uses it in production or has any tips on how to leverage the tool in their environment. I'm looking for suggestions.

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  • Prevent Apache from chunking gzipped content

    - by Bear
    When using mod_deflate in Apache2, Apache will chunk gzipped content, setting the Transfer-encoding: chunked header. While this results in a faster download time, I cannot display a progress bar. If I handle the compression myself in PHP, I can gzip it completely first and set the Content-length header, so that I can display a progress bar to the user. Is there any way to change Apache's behavior, and have Apache set a Content-length header instead of chunking the response, so that I don't have to handle the compression myself?

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  • Choosing sound codec for network (c/c++)

    - by ergey
    Hi, I'am imnplementing real-time sound (voice) recording and transferring to another point in my application. I would ask who knows good codec or compression algorithm to transfer low-quality (max 32 kbit) sound data through the network. I know skype uses good compression, what codec use it? Thank you.

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  • Please help! request compression

    - by Naor
    Hi, I wrote an IHttpModule that compress my respone using gzip (I return a lot of data) in order to reduce response size. It is working great as long as the web service doesn't throws an exception. In case exception is thrown, the exception gzipped but the Content-encoding header is disappear and the client doesn't know to read the exception. How can I solve this? Why the header is missing? I need to get the exception in the client. Here is the module: public class JsonCompressionModule : IHttpModule { public JsonCompressionModule() { } public void Dispose() { } public void Init(HttpApplication app) { app.BeginRequest += new EventHandler(Compress); } private void Compress(object sender, EventArgs e) { HttpApplication app = (HttpApplication)sender; HttpRequest request = app.Request; HttpResponse response = app.Response; try { //Ajax Web Service request is always starts with application/json if (request.ContentType.ToLower(CultureInfo.InvariantCulture).StartsWith("application/json")) { //User may be using an older version of IE which does not support compression, so skip those if (!((request.Browser.IsBrowser("IE")) && (request.Browser.MajorVersion <= 6))) { string acceptEncoding = request.Headers["Accept-Encoding"]; if (!string.IsNullOrEmpty(acceptEncoding)) { acceptEncoding = acceptEncoding.ToLower(CultureInfo.InvariantCulture); if (acceptEncoding.Contains("gzip")) { response.AddHeader("Content-encoding", "gzip"); response.Filter = new GZipStream(response.Filter, CompressionMode.Compress); } else if (acceptEncoding.Contains("deflate")) { response.AddHeader("Content-encoding", "deflate"); response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress); } } } } } catch (Exception ex) { int i = 4; } } } Here is the web service: [WebMethod] public void DoSomething() { throw new Exception("This message get currupted on the client because the client doesn't know it gzipped."); } I appriciate any help. Thanks!

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  • Image Resizing and Compression

    - by GSTAR
    Hi guys, I'm implementing an image upload facility for my website. The uploading facility is complete but what I'm working on at the moment is manipulating the images. For this task I am using PHPThumb (http://phpthumb.gxdlabs.com). Anyway as I go along I'm coming across potential issues, to do with resizing and compression. Basically I want to acheive the following results: The ideal image dimensions are: 800px width, 600px height. If an uploaded image exceeds either of these dimensions, it will need be resized to meet the requirements. Otherwise, leave as it is. The ideal file size is 200kb. If an uploaded image exceeds this then it will need to be compressed to meet this requirement. Otherwise, leave as it is. So in a nutshell: 1) Check the dimensions, resize if required. 2) Check the filesize, compress if required. Has anybody done anything like this / could you give me some pointers? Is PHPThumb the correct tool to do this in?

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  • Why is IIS7 not compressing my static files?

    - by Peter Evjan
    I am trying to get IIS to compress jquery.js (and all other static files, but using jquery as the example here) on my localhost, but something goes wrong. The funny part is that when I look in my %SystemDrive%\inetpub\temp\IIS Temporary Compressed Files\MySiteName, I see the jquery.js file there, and its size is 24 KB. But in the browser, according to the Net tab on Firebug, the size is 69 kb. I've tried the following: - Checked that my browser accept compression. I found "Accept-Encoding gzip, deflate" in the request header via Firebug - Enabling Failed Request Tracing. Nothing turns up in the %SystemDrive%\inetpub\logs\FailedReqLogFiles folder after I do my request though.

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  • For large files compress first then transfer or rsync -z? which would be fastest?

    I have a ton of relativity small data files but they take up about 50 GB and I need them transferred to a different machine. I was trying to think of the most efficient way to do this. Thoughts I had were to gzip the whole thing then rsync it and decompress it, rely on rsync -z for compression, gzip then use rsync -z. I am not sure which would be most efficient since I am not sure how exactly rsync -z is implemented. Any ideas on which option would be the fastest?

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  • What do the numbers 240 and 360 mean when downloading video? How can I tell which video is more compressed?

    - by DaMing
    I have downloaded some computer science lectures from YouTube recently. There is usually more than one choice of file size and file format to download. I noticed that for the same video, the downloadable one with FLV 240 extension is larger than another one with MPEG4 360 extension. What does the number (240 and 360) mean? And which file's compression rate is bigger? That is to say, which one removed much more file elements than the other from the orignal file?

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  • Can Apache 2 be configured to start sending gzipped data early?

    - by rikh
    We have Apache set up to gzip compress html pages before they are sent to the client browser. However, some of our pages are slowish to generate and it seems that Apache is holding on until it has the complete page, compressing it, then sending it to the browser. There are big chunks of the page (the main important bits) that are actually generated and output fairly quickly. Is it possible to configure Apache to start compressing and send data for the page as soon as the script starts outputting something? Is it is, can you offer any help is how to do this? If not, can you suggest any other way to get gzip compression working for the server? The scripts that generate the pages are written in PHP. We are using Apache 2.0 on Linux.

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  • Scanned JPEGs are large and slow to load - can they be optimized losslessly?

    - by Alistair Knock
    I have hundreds of JPEG photographs which were scanned about 5 years ago from negative using a Konica Minolta DiMAGE Scan Dual IV. The dimensions are ~4500x3000, and the filesize is around 12Mb, compared to shots from a DSLR with dimensions of 3000x2300 and filesize of 2-4Mb (actually, these are the output from a RAW convertor). The filesize is obviously quite a big difference, but the issue that's bothering me is that the (perceived) loading time is at least 10 times slower. Is this size/speed discrepancy likely to be because the scanner software saved the JPEGs inefficiently / using an old compression format, or is it simply that the scanned negatives contain much more "detail" (in the form of grain/noise) than the digital images? If the former, is there a way to losslessly optimize them? I've tried re-exporting the scanned files to full size JPEG from my RAW software but the filesize is pretty much the same. Both files will have been saved at 100 quality.

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  • To decide where to crop an image, how can I highlight it's most compressible areas?

    - by Umber Ferrule
    I'm looking to get the most compression out of each of the most popular image formats, such as, JPEG, PNG, GIF, etc. Ideally, this would be a tool, or a series of transforms that could be performed (perhaps using a macro and then discarded) in popular image editors (Paint.NET/PaintShopPro/PhotoShop/GIMP) to highlight areas which will compress less. Alternatively, what rules of thumb can be used other than reducing colours (for PNG/GIF), reducing image dimensions, avoiding high detail areas... I'm not asking for help deciding what format to use for a particular image type as I think this is fairly common knowledge, i.e. diagram and images with few colours = PNG/GIF, photographs = JPEG.

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  • Should you archive documents before backing up to the cloud?

    - by gabbsmo
    I'm planning to add a cloud storage to my personal backup strategy. But now I wonder if it really is worth the trouble of compressing my documents and photos. The Open XML-format already have zip-compression and JPEG is a lossy image format. So there really isn't much benefit in compressing. 20Mb of documents become about 17Mb at the ULTRA preset of 7-zip. One benefit I can imagine is that you can shorten upload time by archiving the folders since it minimizes the number of requests that is needed to be sent to the server at upload and download. So what are your thoughts and experience in this issue? Should you archive your documents before backing them up to the cloud?

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  • Compress snapshot backups with duplicates

    - by Usavich
    I have a set of backups of mostly photos. The directory looks sort of like this: backup/Day1/photos/1.jpg .../2.jpg backup/Day2/photos/2.jpg .../3.jpg .../4.jpg backup/DayN/photos/2.jpg .../3.jpg .../9.jpg Files with same name are identical. There are many duplicates. Due to the way the backup system works, it's not possible to create incremental backup directly. I always get the entire dump each day. If I want to create a compressed archive for a date range, say Day 5~9, what is the best tool/compression algorithm to do that?

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  • PPTP server connection closes - Too much data?

    - by Sebastian Hoitz
    I set up a PPTP server for my company. However, every time I have another computer connected to this server (i.e. our backup server) and a lot of data gets transferred, the connection to this computer closes. In the syslog on the PPTP server I find this message: Apr 22 12:44:34 komola-chase pptpd[2581]: CTRL: Reaping child PPP[2583] Apr 22 12:44:34 komola-chase pppd[2583]: MPPE disabled Apr 22 12:44:34 komola-chase pppd[2583]: Connection terminated. Apr 22 12:44:34 komola-chase pppd[2583]: Exit. Apr 22 12:44:34 komola-chase pptpd[2581]: CTRL: Client 192.168.0.11 control connection finished Apr 22 12:55:11 komola-chase pptpd[2674]: GRE: xmit failed from decaps_hdlc: No buffer space available Apr 22 12:55:11 komola-chase pptpd[2674]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7) Apr 22 12:55:11 komola-chase pppd[2675]: Modem hangup Apr 22 12:55:11 komola-chase pppd[2675]: Connect time 23.0 minutes. Hopefully you can help me as to what is wrong. As far as I can tell, there is no compression enabled on the PPTP server (npbsdcomp option). Thank you!

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  • Best video codec to store my own collection

    - by Jack
    Hello! I think this question has already been asked but with different flavours. My problem resised in the fact that my camera (Canon G9) creates video with almost raw codec (I think it's plain old MPEG) so a 10 minutes video is almost 900mb. I would like to convert them in a format that has a good trade-off between space and quality, but I would prefer having the quality as good as the original (of course this is not possible because of lossy compression) just saving as much space is possible with a minimal lose of quality. Which codec should I look for? H264? It seems to be the champion of the moment.. otherwise which other ones could I try? XviD? Which parameters should I use? I mean how many kbits/s is a fair good bitrate to keep high quality? And what about audio codec? video specs are 640x480 at 30fps or 1024x768 at 15fps.. thanks in advance!

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  • Why is IIS 7.5 seeing some requests as HTTP/1.0?

    - by Zhaph - Ben Duguid
    While trying to work out why Static File Compression wasn't working on one of our IIS servers, the error was coming back as "NO_COMPRESSION_10" which translates to: Server not configured to compress 1.0 requests Looking at the requests in Fiddler, I can see that I'm requesting HTTP 1.1, but everything is being sent back as HTTP 1.0: Request (from chrome, captured via Fiddler): GET /css/reset.css HTTP/1.1 Host: [-----].com Connection: keep-alive Cache-Control: max-age=0 If-Modified-Since: Tue, 16 Oct 2012 15:04:34 GMT User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.95 Safari/537.11 Accept: text/css,*/*;q=0.1 Referer: http://[-----].com/ Accept-Encoding: gzip,deflate,sdch Accept-Language: en-GB,en;q=0.8,en-US;q=0.6 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 Response from IIS: HTTP/1.0 200 OK Cache-Control: no-cache, no-store Pragma: no-cache Content-Type: text/html; charset=utf-8 Expires: -1 Server: Microsoft-IIS/7.5 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Tue, 11 Dec 2012 11:57:03 GMT Connection: close Content-Length: 108837 Other servers with the same host that I'm running this site on all respond with HTTP/1.1. How can I persuade IIS to respond with HTTP/1.1 rather than HTTP/1.0? Edit to add: Digging deeper, I can see that some responses from the server are indeed being returned compressed, so I guess really I'm trying to work out why talking to this particular server from our office seems to result in it seeing 1.0 requests, while other servers at the same co-loc don't?

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  • Concatenating gziped Apache logs

    - by markdrayton
    We rotate and compress our Apache logs each day but it's become apparent that this isn't frequently enough. An uncompressed log is about 6G, which is getting close to filling our log partition (yep, we'll make it bigger in the future!) as well as taking a lot of time and CPU to compress each day. We have to produce a gziped log for each day for our stats processing. Obviously we could move our logs to a partition with more space but I also want to spread the compression overhead throughout the day. Using Apache's rotatelogs we can rotate and compress the log more often -- hourly, say -- but how can I concatenate all the hourly compressed logs into a running compressed log for the day, without decompressing the previous logs? I don't want to uncompress 24 hours' worth of data and recompress it because that has all the disadvantages of our current solution. Gzip doesn't seem to offer any append or concatenate option but perhaps I've missed something obvious. This question suggests straight shell concatenation "works" in that the archive can be decompressed but that gzip -l doesn't work seems a bit dodgy. Alternatively, perhaps this is still a bad way to do things. Other suggestions are welcome -- our only constraints are our relatively small log partitions and the need to provide a daily compressed log.

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  • Optimized .htaccess???

    - by StackOverflowNewbie
    I'd appreciate some feedback on the compression and caching configuration below. Trying to come up with a general purpose, optimized compression and caching configuration. If possible: Note your PageSpeed and YSlow grades Add configuration to your .htaccess Clear your cache Note your PageSpeed and YSlow grades to see if there are any improvements (or degradations) NOTE: Make sure you have appropriate modules loaded. Any feedback is much appreciated. Thanks. # JavaScript MIME type issues: # 1. Apache uses "application/javascript": http://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x/conf/mime.types # 2. IIS uses "application/x-javascript": http://technet.microsoft.com/en-us/library/bb742440.aspx # 3. SVG specification says it is text/ecmascript: http://www.w3.org/TR/2001/REC-SVG-20010904/script.html#ScriptElement # 4. HTML specification says it is text/javascript: http://www.w3.org/TR/1999/REC-html401-19991224/interact/scripts.html#h-18.2.2.2 # 5. "text/ecmascript" and "text/javascript" are considered obsolete: http://www.rfc-editor.org/rfc/rfc4329.txt #------------------------------------------------------------------------------- # Compression #------------------------------------------------------------------------------- <IfModule mod_deflate.c> AddOutputFilterByType DEFLATE application/xhtml+xml AddOutputFilterByType DEFLATE application/xml AddOutputFilterByType DEFLATE application/atom+xml AddOutputFilterByType DEFLATE text/css AddOutputFilterByType DEFLATE text/html AddOutputFilterByType DEFLATE text/plain AddOutputFilterByType DEFLATE text/xml # The following MIME types are in the process of registration AddOutputFilterByType DEFLATE application/xslt+xml AddOutputFilterByType DEFLATE image/svg+xml # The following MIME types are NOT registered AddOutputFilterByType DEFLATE application/mathml+xml AddOutputFilterByType DEFLATE application/rss+xml # Deal with JavaScript MIME type issues AddOutputFilterByType DEFLATE application/javascript AddOutputFilterByType DEFLATE application/x-javascript AddOutputFilterByType DEFLATE text/ecmascript AddOutputFilterByType DEFLATE text/javascript </IfModule> #------------------------------------------------------------------------------- # Expires header #------------------------------------------------------------------------------- <IfModule mod_expires.c> # 1. Set Expires to a minimum of 1 month, and preferably up to 1 year, in the future # (but not more than 1 year as that would violate the RFC guidelines) # 2. Use "Expires" over "Cache-Control: max-age" because it is more widely accepted ExpiresActive on ExpiresByType application/pdf "access plus 1 year" ExpiresByType application/x-shockwave-flash "access plus 1 year" ExpiresByType image/bmp "access plus 1 year" ExpiresByType image/gif "access plus 1 year" ExpiresByType image/jpeg "access plus 1 year" ExpiresByType image/png "access plus 1 year" ExpiresByType image/svg+xml "access plus 1 year" ExpiresByType image/tiff "access plus 1 year" ExpiresByType image/x-icon "access plus 1 year" ExpiresByType text/css "access plus 1 year" ExpiresByType video/x-flv "access plus 1 year" # Deal with JavaScript MIME type issues ExpiresByType application/javascript "access plus 1 year" ExpiresByType application/x-javascript "access plus 1 year" ExpiresByType text/ecmascript "access plus 1 year" ExpiresByType text/javascript "access plus 1 year" # Probably better to explicitly declare MIME types than to have a blanket rule for expiration # Uncomment below if you disagree #ExpiresDefault "access plus 1 year" </IfModule> #------------------------------------------------------------------------------- # Caching #------------------------------------------------------------------------------- <IfModule mod_headers.c> <FilesMatch "\.(bmp|css|flv|gif|ico|jpg|jpeg|js|pdf|png|svg|swf|tif|tiff)$"> Header add Cache-Control "public" Header unset ETag Header unset Last-Modified FileETag none </FilesMatch> </IfModule>

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  • NTFS-compressing Virtual PC disks (on host and/or guest)

    - by nlawalker
    I'm hoping someone here can answer these definitively: Does putting a VHD file in an NTFS-compressed folder on the host improve performance of the virtual machine, diminish performance, or neither? What about using NTFS compression within the guest? Does using compresssion on either the host or the guest lead to any problems like read or write errors? If I were to put a VHD in a compressed folder on the host, would I benefit from compacting it? I've seen references to using NTFS compression on quite a few VPC "tips and tricks" blog posts, and it seems like half of them say to never do it and the other half say that not only does it save disk space but it actually can improve performance if you have a fast CPU and your primary performance bottleneck is the disk.

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  • logrotate compress files after the postrotate script

    - by Thomas
    I have an application generating a really heavy big log file every days (~800MB a day), thus I need to compress them but since the compression takes time, I want that logrotate compress the file after reloading/sending HUP signal to the application. /var/log/myapp.log { rotate 7 size 500M compress weekly postrotate /bin/kill -HUP `cat /var/run/myapp.pid 2>/dev/null` 2>/dev/null || true endscript } Is it already the case that the compression takes place after the postrotate (which would be counter-intuitive)? If not Can anyone tell me if it's possible to do that without an extra command script (an option or some trick)? Thanks Thomas

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