segunda-feira, 29 de julho de 2013

Why YouTube buffers: The secret deals that make—and break—online video

URL: http://arstechnica.com.feedsportal.com/c/35364/f/663715/s/2f456d95/sc/21/l/0Larstechnica0N0Cinformation0Etechnology0C20A130C0A70Cwhy0Eyoutube0Ebuffers0Ethe0Esecret0Edeals0Ethat0Emake0Eand0Ebreak0Eonline0Evideo0C/story01.htm


Aurich Lawson

Lee Hutchinson has a problem. My fellow Ars writer is a man who loves to watch YouTube videos—mostly space rocket launches and gun demonstrations, I assume—but he never knows when his home Internet service will let him do so.

"For at least the past year, I've suffered from ridiculously awful YouTube speeds," Hutchinson tells me. "Ads load quickly—there's never anything wrong with the ads!—but during peak times, HD videos have been almost universally unwatchable. I've found myself having to reduce the quality down to 480p and sometimes even down to 240p to watch things without buffering. More recently, videos would start to play and buffer without issue, then simply stop buffering at some point between a third and two-thirds in. When the playhead hit the end of the buffer—which might be at 1:30 of a six-minute video—the video would hang for several seconds, then simply end. The video's total time would change from six minutes to 1:30 minutes and I'd be presented with the standard 'related videos' view that you see when a video is over."

Hutchinson, a Houston resident who pays Comcast for 16Mbps business-class cable, is far from alone. As one Ars reader recently complained, "YouTube is almost unusable on my [Verizon] FiOS connection during peak hours." Another reader responded, "To be fair, it's unusable with almost any ISP." Hutchinson's YouTube playback has actually gotten better in recent weeks. But complaints about streaming video services—notably YouTube and Netflix—are repeated again and again in articles and support forums across the Internet.

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sábado, 27 de julho de 2013

terça-feira, 23 de julho de 2013

TV 4K Ultra HD ainda engatinha, mas a Globo já pensa em 8K

URL: http://exame.abril.com.br/tecnologia/noticias/tv-4k-ultra-hd-ainda-engatinha-mas-a-globo-ja-pensa-em-8k


De acordo com diretor de engenharia de entretenimento da TV Globo, a tecnologia 8K seria a evolução natural da radiodifusão

Attached media file [image/jpeg] (72486 bytes)

Attached media file [image/jpeg] (72486 bytes)

segunda-feira, 22 de julho de 2013

Intel DH87RL Haswell H87

URL: http://feedproxy.google.com/~r/Phoronix/~3/lN9tgwFVsoQ/vr.php


For those Linux desktop users in the market for a micro-ATX motherboard for use with the latest-generation Haswell processors, the Intel DH87RL motherboard costs a little more than $100 USD and gets along mostly well with modern Linux distributions.

domingo, 14 de julho de 2013

HP Keeps Installing Secret Backdoors In Enterprise Storage

URL: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/QJdNVZWg1KE/story01.htm


Nerval's Lobster writes "For the second time in a month, Hewlett-Packard has been forced to admit it built secret backdoors into its enterprise storage products. The admission, in a security bulletin posted July 9, confirms reports from the blogger Technion, who flagged the security issue in HP's StoreOnce systems in June, before finding more backdoors in other HP storage and SAN products. The most recent statement from HP, following another warning from Technion, admitted that 'all HP StoreVirtual Storage systems are equipped with a mechanism that allows HP support to access the underlying operating system if permission and access is provided by the customer.' While HP describes the backdoors as being usable only with permission of the customer, that restriction is part of HP's own customer-service rules—not a limitation built in to limit use of backdoors. The entry points consist of a hidden administrator account with root access to StoreVirtual systems and software, and a separate copy of the LeftHand OS, the software that runs HP's StoreVirtual and HP P4000 products. Even with root access, the secret admin account does not give support techs or hackers access to data stored on the HP machines, according to the company. But it does provide enough access and control over the hardware in a storage cluster to reboot specific nodes, which would 'cripple the cluster,' according to information provided to The Register by an unnamed source. The account also provides access to a factory-reset control that would allow intruders to destroy much of the data and configurations of a network of HP storage products. And it's not hard to find: 'Open up your favourite SSH client, key in the IP of an HP D2D unit. Enter in yourself the username HPSupport, and the password which has a SHA1 of 78a7ecf065324604540ad3c41c3bb8fe1d084c50. Say hello to an administrative account you didn't know existed,' according to Technion, who claims to have attempted to notify HP for weeks with no result before deciding to go public."

Read more of this story at Slashdot.