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How can I extract a good quality JPEG image from a video file with ffmpeg?
... This seems to have no effect for me-- qscale 1 and 2 both give identical file sizes and (to my naked eye) appear the same as without qscale at all.
– felwithe
Jan 28 '15 at 23:03
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Grepping a huge file (80GB) any way to speed it up?
... your command becomes:
LC_ALL=C fgrep -A 5 -B 5 'db_pd.Clients' eightygigsfile.sql
It will also be faster if you copy your file to RAM disk.
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Best way to define private methods for a class in Objective-C
...ass as the public methods. So I structure my classes like this:
In the .h file:
@interface MyClass {
// My Instance Variables
}
- (void)myPublicMethod;
@end
And in the .m file:
@interface MyClass()
- (void)myPrivateMethod;
@end
@implementation MyClass
- (void)myPublicMethod {
// I...
How can I run MongoDB as a Windows service?
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It requires a logfile path, you can add the dbpath and logfile path like this mongod --dbpath="c:\data\db" --logpath="c:\data\db\log.txt" --install , After this you need to run net start MongoDB.
– sivaram636
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How to explain callbacks in plain english? How are they different from calling one function from ano
...he same kind of common sense. Consider how programmers normally write to a file:
fileObject = open(file)
# now that we have WAITED for the file to open, we can write to it
fileObject.write("We are writing to the file.")
# now we can continue doing the other, totally unrelated things our program doe...
Why am I getting “Unable to find manifest signing certificate in the certificate store” in my Excel
... Signing tab and either
Click on Select from store
Click on Select from file
Click on Create test certificate
Once either of these is done, you should be able to build it again.
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How do I start Mongo DB from Windows?
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Step 3
Create the following folder
C:\data\db
Step 4
cd to C:\Program Files\MongoDB\Server\3.2\bin>
enter command mongod
by default, mongodb server will start at port 27017
Step 5
(optionally) download RoboMongo and follow normal setup instructions
Step 6
Start RoboMongo and creat...
How to generate an openSSL key using a passphrase from the command line?
...ocesses.
A better alternative is to write the passphrase into a temporary file that is protected with file permissions, and specify that:
openssl genrsa -aes128 -passout file:passphrase.txt 3072
Or supply the passphrase on standard input:
openssl genrsa -aes128 -passout stdin 3072
You can als...
Excluding directory when creating a .tar.gz file
...ml/ folder, in that folder there's a /tmp/ folder that has like 70gb of files I don't really need.
10 Answers
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Does a favicon have to be 32x32 or 16x16?
... IE, Microsoft recommends 16x16, 32x32 and 48x48 packed in the favicon.ico file.
For iOS, Apple recommends specific file names and resolutions, at most 180x180 for latest devices running iOS 8.
Android Chrome primarily uses a manifest and also relies on the Apple touch icon.
IE 10 on Windows 8.0 req...