The other day I discovered that some JPEGs I'd posted to my (self-hosted) WordPress blog had been compressed. The subject of my blog happens to be anaglyph 3D photos... and if the images are not saved at a very high resolution, a phenomenon called "ghosting" or "crosstalk" appears, where parts of the image that are only supposed to be visible to one eye are visible to the other eye as well. This can ruin the 3D effect. So it's important that my images are uploaded and posted with no added compression. The problem is that I don't know exactly where the problem occurred. Details below... [more inside]
posted by Artifice_Eternity
on Apr 16, 2013 -
So, I definitely want to convert all my high bit rate mp3 songs in iTunes to a lower bitrate of 190. I have the bit rate setting changed in iTunes, and I know when I right click and choose "make mp3 copy" it does exactly that. BUT, I don't want the original around anymore in iTunes and don't want to manually go through and delete them or go into the folder to do that. The threads I have looked at tell me how to do the first but don't address the issue that I still have the higher bit-rate copy in iTunes. I have a lot of music, I don't want the higher copies cluttering it. (I have a backup of the originals anyway). Is there something I am missing so it just lowers bitrate but doesn't make it a copy?
posted by snap_dragon
on Jan 17, 2013 -
How can I compress/resize thousands of jpgs to fit exactly
into the space of a DVD automatically? [more inside]
posted by Infernarl
on Apr 27, 2012 -
What are your favorite current recordings with good dynamic range, preferably jazz and blues? [more inside]
posted by thrasher
on Apr 25, 2012 -
I am looking for information about decompressing "MediaPaq" archives, with .paq extensions. I am finding the Internet surprisingly silent. [more inside]
posted by sagwalla
on Jan 21, 2012 -
Can somebody please explain to me image compression, specifically with regard to creating smallish PDFs from Indesign files that contain large linked vector graphics? [more inside]
posted by This_Will_Be_Good
on Nov 20, 2011 -
Aside from preventing chafing, what are the benefits of compression shorts for running? Are there drawbacks? [more inside]
posted by Terriniski
on Jul 31, 2011 -
What software will allow me to record from a FireWire source directly to a compressed format that I can deliver to workshop attendees? [more inside]
posted by jmsta
on Jun 23, 2011 -
I'm in need of graduate level schooling on psychoacoustics and audio compression on the cheap. What are the latest and/or most used textbooks on these topics? [more inside]
posted by waxboy
on Feb 10, 2011 -
This year for Christmas, I'd like to get my parents the gift of converting all their VHS tapes to digital format. I'm a sometime video editor and effects artist, so I need a solution that's a) cheap, b) not too involved, workflow-wise, and c) meets my video nerd half's demand for quality. What's the best solution that fits all three? [more inside]
posted by tweebiscuit
on Dec 14, 2010 -
Why doesn't the compress feature on my Mac actually compress the files? It creates a .zip file but it's usually only a couple hundred k smaller than the original. [more inside]
posted by amanda
on May 10, 2010 -
Any video compression mavens in the house?
Is there a specific codec which excels in compressing line graphics?
I'm trying to compress three videos for the web. The first two look fine, but the third looks absolutely awful. The ones that look fine are filmed, with actors; The one that looks terrible is entirely comprised of a line graphic and scrolling text. Upon compression, the bottom half of the screen looks blocky and jumbled... See here
(uncompressed at right, compressed at left).
I used H.264 encoding and 700 kbps, as instructed... But I also experimented with higher bit rates and quality, to no avail. [more inside]
posted by Silky Slim
on Apr 18, 2010 -
I want to create the smallest (file size) possible audio file that, when repeated, will sound like a given note (e.g. 440hz A). I think this needs to be just the length of one wavelength, but I'm not sure how I translate that to a length of time, or if the smallest audio format is one in which note duration doesn't matter.
I don't care if this tone sounds artificial, but it needs to play natively in Firefox, Safari, and Chrome browsers. Is MIDI the best (most compressed) format for this or should I use something else? And what (ideally free) software might I use to create the files, given access to OSX and Windows XP?
posted by scottreynen
on Jan 23, 2010 -
Is there an audio plugin that will emulate the mono sound compression used by AM radio stations?
posted by Yakuman
on Oct 29, 2009 -
Is there a good real-time compressor/limiter for FM broadcast that I can use on a Mac? Preferably one that works as an AudioUnit (AU) plug-in? [more inside]
posted by CommonSense
on Apr 21, 2009 -
How to best encrypt and compress a folder of html-files in the iPhone app bundle, and unpack on first start? (DRM) [more inside]
posted by avocade
on Mar 4, 2009 -
How can I store DVDs for use in a media library and get the benefits of compression without losing the menu structure and special features? [more inside]
posted by odinsdream
on Feb 21, 2009 -
I am searching for a freeware utility for mac osx 10.3 and higher that can be used to compress files. Can't seem to find anything...
posted by citybuddha
on Dec 28, 2008 -
I'm thinking of buying a camcorder. My requirements are slightly unusual: I would like one that does all the "bells and whistles" stuff (image stabilisation, auto light balance, H.264 compression etc). But I also want to be able to turn off all the clever stuff and access the "raw" video. Any recommendations? Hard disk/SD recording is a must, high definition would be good.
posted by handee
on Nov 21, 2008 -
Is it reasonable for a 1995 Honda Odyssey engine with 150K miles on it to have a compression of 179? [more inside]
posted by wsg
on Nov 19, 2008 -
I using Mac the Ripper than Handbrake to turn DVDs into mp4 files. (I use DVD dual layer)...When I use Roxio Popcorn, I can fit several movies on a disc (4) but it takes honestly a day and a half to burn on DVD !!!! But the DVD plays perfectly in my cheap player. Trying a different route, I tried dragging the mp4s to a blank DVD disc and then clicking "Burn" -- it burns and takes only 30-40 minutes but this version will not play on my DVD player. Anybody out there have an idea what I can do to make the process more efficient? Different software or different method? I appreciate your insight. By the way, I am running Mac OX X 10.5.5.
posted by snap_dragon
on Nov 15, 2008 -
I am using Mac the Ripper and Roxio Popcorn successfully to rip, compress, and burn DVDs. I have leftover DVD-R Dual Layer DVDs -- is it possible to fit to movies on a DVD? I tried a few ways and it only shows one movie. Any settings I could change? Any other software? Thanks.
posted by snap_dragon
on Oct 8, 2008 -
I recently became an Arbitron ratings person (which I'm not allowed to tell anyone, hence my anonymity). I'm supposed to carry a portable device that they say picks up "sound energy" signals embedded by participating radio and TV stations so they know what I'm listening to, even if the audio is compressed. What the heck is "sound energy"? [more inside]
posted by anonymous
on Sep 14, 2008 -
OS X filter: How can I recursively unzip files (in directories that are not zipped)? [more inside]
posted by wheat
on Aug 17, 2008 -
A question for chemists - I am doing a calculation about the energy requirements of taking CO2 at atmospheric pressure and temperature and compressing it to 2 MPa (2000 kPa, about 300 psi) and cooling it to -31ºC and am a bit uncertain about handling the phase change from gas to liquid. [more inside]
posted by gspm
on Jul 24, 2008 -
Is there an automated script or program to create a separate zip file for each directory? [more inside]
posted by niwnfyc
on Jul 7, 2008 -
Is it safe to assume that anyone professionally employed in a computer-using job (secretary, assistant, ect.) is familiar with ZIP archives? What about the public at large? [more inside]
posted by unmake
on Jun 18, 2008 -
I have just bought a Flip Ultra but the included compression software to make large video files email or YouTube ready is unbelievably slow. I'm on a PC, running XP. Can you recommend any third party compression software?
posted by lometogo
on Apr 26, 2008 -
Outlook Cleaning/Archive Gurus: Help me eliminate emails with similar (but not duplicate) content! [more inside]
posted by colecovizion
on Apr 24, 2008 -
Can anyone recommend a small/lightweight image compression program that can run on Windows Server 2003?
Thanks [more inside]
posted by bloodniece
on Mar 4, 2008 -
compressed files inside of compressed files inside of compressed files. arg. please help me automate this process. [more inside]
posted by yonation
on Feb 9, 2008 -
Stupid-question-filter: Suppose you have a 10 MP camera and take your pictures at 3 MP. Would the quality be any different than if you were using a 3 MP camera at its top setting? (assuming the two cameras are otherwise identical) [more inside]
posted by lullabyofbirdland
on Feb 7, 2008 -
Preparing videos for youtube: what are the most efficient video/audio compressions to use when trying to keep a video under 100 MBs with sacrificing as little quality as possible? [more inside]
posted by Mach3avelli
on Dec 17, 2007 -
Hi there, I am doing an honours project on the effects of boat noise on dolphin communication and my supervisor had this idea of using compression to analyse this.
He basically suggested that we record dolphin vocalizations in the presence and absence of boat noise, and then compress the files and determine which compresses more (dolphin sounds with the boat noise, or dolphin sounds without the boat noise). His thinking was that less complex sounds should compress less...so he thinks that boat noise will compress less than dolphin vocalizations. Thus, if dolphin vocalizations happen to compress more in the presence of boat noise than they do without the boat noise...this would sort of imply they are "losing information" so to speak. Does this make sense?
posted by Racergirl
on Jun 25, 2007 -
A follow-up to this
question: I need to get uncompressed digital video recorded to a hard drive for the purpose of developing compression algorithms. I need a portable solution. High-def is not required. [more inside]
posted by donpardo
on Apr 26, 2007 -