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How can I extract a good quality JPEG image from a video file with ffmpeg?
...le: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 de...
How do I calculate the normal vector of a line segment?
Suppose I have a line segment going from (x1,y1) to (x2,y2). How do I calculate the normal vector perpendicular to the line?
...
Return first match of Ruby regex
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135
You could try variableName[/regular expression/]. This is an example output from irb:
irb(mai...
How do I empty an array in JavaScript?
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18 Answers
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How do I convert a hexadecimal color to rgba with the Less compiler?
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edited Mar 30 '19 at 21:59
Peter Mortensen
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Is there a way to check if int is legal enum in C#?
... page:
using System;
[Flags] public enum PetType
{
None = 0, Dog = 1, Cat = 2, Rodent = 4, Bird = 8, Reptile = 16, Other = 32
};
public class Example
{
public static void Main()
{
object value;
// Call IsDefined with underlying integral value of member.
value = ...
Swift equivalent for MIN and MAX macros
...
125
min and max are already defined in Swift:
func max<T : Comparable>(x: T, y: T, rest: T....
How is “=default” different from “{}” for default constructor and destructor?
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105
This is a completely different question when asking about constructors than destructors.
If y...
How to specify maven's distributionManagement organisation wide?
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145
The best solution for this is to create a simple parent pom file project (with packaging 'pom'...
Anonymous recursive PHP functions
...rence
$factorial = function( $n ) use ( &$factorial ) {
if( $n == 1 ) return 1;
return $factorial( $n - 1 ) * $n;
};
print $factorial( 5 );
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