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How can I extract a good quality JPEG image from a video file with ffmpeg?
...ale:v (or the alias -q:v) as an output option.
Normal range for JPEG is 2-31 with 31 being the worst quality.
The scale is linear with double the qscale being roughly half the bitrate.
Recommend trying values of 2-5.
You can use a value of 1 but you must add the -qmin 1 output option (because the d...
Extract substring using regexp in plain bash
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edited Dec 26 '17 at 23:17
Yangshun Tay
26.9k2121 gold badges8787 silver badges114114 bronze badges
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Yes/No message box using QMessageBox
...on Qt 4 and 5, requires QT += widgets on Qt 5, and CONFIG += console on Win32 to see qDebug() output.
See the StandardButton enum to get a list of buttons you can use; the function returns the button that was clicked. You can set a default button with an extra argument (Qt "chooses a suitable defau...
Using Default Arguments in a Function
...ke array('x' => 'x1', 'y' => 'y1')
} else if (func_num_args() == 3) {
$args = func_get_args();
// 3 parameters passed
} else if (func_num_args() == 5) {
$args = func_get_args();
// 5 parameters passed
} else {
throw new InvalidArgumentExcept...
How to animate the change of image in an UIImageView?
...ore/QuartzCore.h>
...
imageView.image = [UIImage imageNamed:(i % 2) ? @"3.jpg" : @"4.jpg"];
CATransition *transition = [CATransition animation];
transition.duration = 1.0f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type =...
Maven skip tests
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130
As you noted, -Dmaven.test.skip=true skips compiling the tests. More to the point, it skips bui...
LINQ - Left Join, Group By, and Count
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Mehrdad AfshariMehrdad Afshari
379k8383 gold badges822822 silver badges775775 bronze badges
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Why must a nonlinear activation function be used in a backpropagation neural network? [closed]
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13 Answers
13
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width:auto for fields
...rently than everyone else so it's not consistent.)
<div style='padding:30px;width:200px;background:red'>
<form action='' method='post' style='width:200px;background:blue;padding:3px'>
<input size='' style='width:100%;margin:-3px;border:2px inset #eee' />
<br /><...
JavaScript REST client Library [closed]
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139
You don't really need a specific client, it's fairly simple with most libraries. For example in...