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Extend Mac OS X's Screenshots

Mac OS X has a variety of built in screenshot methods. Here's a look at a few that offer more versatility than the basic full-screen capture (Command-Shift-3):

• Press Command-Shift-4 and you'll get a crosshair cursor with which you can drag to select and capture a certain area of the screen.

• Press Command-Shift-4-Space to select the entire window that the cursor is over, clicking on the window will then capture it. The resulting screenshot will even get a nice drop shadow.

• Hold down the Space bar after dragging out a selection window to move your selection rectangle around on the screen.

• Hold down Shift after dragging out a selection to constrain the selection in either horizontal or vertical orientation, depending on the direction of your drag.

• Hold down Option after dragging out a selection to expand the selection window around a center point.

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Public Radio Group Finds iOS 6.0 Streaming Bandwidth Bug

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The Public Radio Exchange (PRX), a clearinghouse for and producer of public radio programs, helped This American Life and other shows sort out an iOS 6.0-related spike in bandwidth usage by uncovering a bug in a fundamental part of the operating system.

PRX was asked by This American Life for help in figuring out a spike in bandwidth bills in October 2012, and found a similar problem in its own logs. It isolated the behavior to ensure its own streaming apps weren’t at fault. PRX’s analysis shows that apps that rely on iOS frameworks to handle networked audio streaming in iOS 6.0 make multiple overlapping requests for audio that substantially increase the total number of bytes downloaded. The blog entry noted that a 30 MB podcast consumed 100 MB by the completion of a streamed episode, an exact ratio (30 MB taking 100 MB) that we and our readers have seen as well.

PRX writes that the bug disappeared in 6.0.1 and couldn’t be replicated in iOS 5, nor did the group test anything but access via Wi-Fi. Nonetheless, we’re convinced that the problem isn’t limited to streaming media or Wi-Fi. Readers continue to post stories of massive data consumption over 3G, 4G, and LTE without using the Podcasts app or other streaming audio and video apps; that applies while they are within range of a Wi-Fi network in their homes and when they are using programs that allow disabling mobile broadband usage. Twitter users also immediately noted that they continue to have problems even after the iOS 6.0.1 update.

Our previous coverage includes Matt Neuburg’s deep dive, “Mysterious iOS 6 Cellular Data Usage: A Deeper Look” (24 October 2012) and my earlier examination, “What’s Behind Mysterious Cellular Data Usage in iOS 6?” (29 September 2012). Since this article was first published, Adam has written about the reappearance of DataMan Pro, an iOS app that can report on the cellular data usage of individual apps (see “Track Per-App Data Usage in iOS with DataMan Pro,” 20 November 2012).

If you continue to experience mysterious jumps in cellular data consumption and are charged for it by your carrier, we recommend asking customer service to remove the charges, and documenting your usage and any calls you make to the carrier about the issue in case you are required to make a claim later to obtain a refund.

(Hat tip to Michael Panzarino at The Next Web for the link to the story, and his reciprocal link to our previous coverage.)

 

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Comments about Public Radio Group Finds iOS 6.0 Streaming Bandwidth Bug
(Comments are closed.)

Hart Bezner  An apple icon for a TidBITS Contributor 2012-11-15 10:09
"PRX was asked by This American Life for help in figuring out a spike in bandwidth bills in October" is a meaningless statement.

You probably meant "data usage" bills.

This is not a case of pedantry but an attempt to clarify obfuscation.
Glenn Fleishman  An apple icon for a TidBITS Staffer 2012-11-15 10:20
I understand your point, but one pays for one's use of bandwidth, in this case in the form of data usage as well as other fees. If you're paying a flat rate plus data usage fees, then calling it a "data usage" bill isn't fully accurate.
Richard Outerbridge  2012-11-20 10:23
The (still) currently available iOS app "Netstat", together with its in-app purchased "Pro" features, may help to sort this mess out.
Adam Engst  An apple icon for a TidBITS Staffer 2012-11-20 11:08
Looks like it can do a lot; if anyone has tried it, do let us know!