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In software engineering, a spinlock is a lock which causes a thread trying to acquire it to simply wait in a loop ('spin') while repeatedly checking if the lock is available. Since the thread remains active but is not performing a useful task, the use of such a lock is a kind of busy waiting.Once acquired, spinlocks will usually be held until they are explicitly released, although in some. Open VLC, then Window - Video Effects - Geometry - Transform. From there you can rotate 90/180/270, flip horizontally or vertically, magnify, clone etc. Perfect if you have a p/w locked no remote garage sale projector like mine.
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Hey there GerryHall, https://nutritionfree.mystrikingly.com/blog/video-compressor-exe.
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It sounds like you are are not able to boot your Mac successfully at this point and you get stuck as a screen with a spinning wheel. I would recommend the troubleshooting from the following article to help you get that resolved, named:
Disconnect, test peripheral devices and network cables
Note: 'Peripheral devices' refers to external devices other than what came with your Mac, such as hard drives, printers, or hubs that you connect via a USB or FireWire cable.
- Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
- Disconnect all peripheral devices such as external hard drives or printers (leave only the display, a keyboard, and mouse connected).
- Disconnect any Ethernet cables.
- Start up your Mac.
- If you can start up this way, one or more of your peripheral devices (or installed software related to the device) is probably causing the gray screen issue. Connect one device, then restart your Mac to test for the issue. Repeat the process until you locate the device at issue. Make sure the device is powered if it needs to be to operate correctly. Check with the manufacturer of the device for support or possible software driver or firmware updates that may be available for the device. Try a different cable with the device if possible (such as a different USB or FireWire cable).
Note: If you have multiple peripheral devices and the issue only occurs when they are all connected, but not when each device is the only peripheral connected, see the Additional Information section below. - If you are using a desktop Mac with a third-party keyboard and/or mouse device, and the issue still occurs, try starting up with an Apple keyboard and mouse connected instead. Try starting with no keyboard and mouse connected, then connect them after start up. Also, try a different USB port on your Mac.
Lions head mac os. If the gray screen issue persists with no devices connected, go to the next section (with the peripherals still disconnected).
Perform a Safe Boot Radagast mac os.
Simply performing a Safe Boot may resolve this issue.
- Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
- Start your Mac, then immediately hold the Shift key. This performs a Safe Boot. Advanced tip: If you want to see the status of a Safe Boot as it progresses, you can hold Shift-Command-V during start up (instead of just Shift).
Note: A Safe Boot takes longer than a typical start up because it includes a disk check and other operations. - If your Mac starts up as expected, immediately try restarting.
If the Safe Boot does not work, or the restart after a successful Safe Boot does not work, go to the next section.
Reset the NVRAM / PRAM
- Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
- Reset the NVRAM / PRAM.
If the gray screen issue persists, go to the next section.
Thank you for using Apple Support Communities.
All the very best,
Sterling Adobe dimension discover new dimensions 3 1.
Sep 24, 2014 8:56 AM
While taking photos is easy, rotating photos manually can be slow.
EXIF orientation solves this.
Auto-rotation
EXIF data is useful information about a JPEG image, hidden inside the file.
![Spin Spin](https://cdn.osxdaily.com/wp-content/uploads/2011/03/rotate-built-in-display-macbook.jpg)
When images are photographed, digital cameras use orientation sensors to store an EXIF orientation value for how the camera is held.
There are 8 possible values (not just landscape and portrait!). The EXIF orientation value is used by Photoshop and other photo editing software to automatically rotate photos, saving you a manual task.
EXIF orientation values
The 8 EXIF orientation values are numbered 1 to 8.
- = 0 degrees: the correct orientation, no adjustment is required.
- = 0 degrees, mirrored: image has been flipped back-to-front.
- = 180 degrees: image is upside down.
- = 180 degrees, mirrored: image has been flipped back-to-front and is upside down.
- = 90 degrees: image has been flipped back-to-front and is on its side.
- = 90 degrees, mirrored: image is on its side.
- = 270 degrees: image has been flipped back-to-front and is on its far side.
- = 270 degrees, mirrored: image is on its far side.
Here's how the 8 possible EXIF values look for the letter F (credit to Dave Perrett for this image):
In scenarios 2, 3, 4, 5, 6, 7, 8, the image orientation should be automatically fixed by your image editing software.
When you upload images to your Sirv account, all the meta data in your image -including EXIF orientation - is saved. You can view the meta by appending ?info to the image URL, which returns a JSON formatted text file. If your photos were not correctly oriented before upload, find out how to fix this.
Incorrect EXIF orientation
Popular photo editing programs can automatically fix the EXIF orientation when an image loads. They also update the meta if you rotate or flip an image manually. Programs including Photoshop, ACDSee, Picasa, GIMP and OSX Preview. However, some programs have been known not to do this, including Windows Photo Viewer, Microsoft Paint and Microsoft Office Picture Manager.
Fixing image orientation
To correct the image orientation before uploading to Sirv:
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- Open the image(s) in your preferred image editing program (e.g. Photoshop).
- Rotate the images to the correct orientation.
- Save the images in high quality (we recommend 92% JPEG quality).
- Upload the fixed images to Sirv.
To correct the orientation of images already uploaded to Sirv, use Sirv's image editor to rotate them. Right-click the image and choose 'Edit image' to open the image editor.
View and edit EXIF orientation
Below are some programs that you can use for viewing and editing EXIF meta data. They'll also let you edit other types of image meta data - IPTC and XMP data - which can help protect your images with copyright information.
Windows EXIF programs
ExifPro allows you to view EXIF orientation information and rotate images through 90° intervals:
Zoner Photo Editor is a photo organizer and editor with an image information feature for viewing EXIF orientation. Professional and free versions are available:
Exiftool is a Perl library/command-line application allowing you to read and edit meta information in images. A standalone Windows executable is provided if you prefer not to use Perl:
Mac EXIF program
Mac OS lets you quickly check the EXIF orientation in Preview. Open an image and press CMD+I to view the images properties.
Linux EXIF program
On Linux, get EXIF info with Gimp or Image Magick (which is usually pre-installed). Get the orientation of an image on your computer with this command in the console:
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-identify -verbose enter/your/image/location-here.jpg | grep Orientation
It will output a result like this: