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Start thread with member function
...he syntax described above is defined in terms of the INVOKE definition (§20.8.2.1):
Define INVOKE (f, t1, t2, ..., tN) as follows:
(t1.*f)(t2, ..., tN) when f is a pointer to a member function of a class T and t1 is an object of type T or a reference to an object of
type T or a refer...
How can I extract a good quality JPEG image from a video file with ffmpeg?
...2).
To output a series of images:
ffmpeg -i input.mp4 -qscale:v 2 output_%03d.jpg
See the image muxer documentation for more options involving image outputs.
To output a single image at ~60 seconds duration:
ffmpeg -ss 60 -i input.mp4 -qscale:v 4 -frames:v 1 output.jpg
This will work with any vid...
Change text from “Submit” on input tag
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answered Dec 23 '12 at 0:00
Ry-♦Ry-
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figure of imshow() is too small
...'t need an equal aspect you can set aspect to auto
imshow(random.rand(8, 90), interpolation='nearest', aspect='auto')
which gives the following figure
If you want an equal aspect ratio you have to adapt your figsize according to the aspect
fig, ax = subplots(figsize=(18, 2))
ax.imshow(random....
How to use Elasticsearch with MongoDB?
...to index MongoDB for use in a NodeJS, Express app on a fresh EC2 Ubuntu 14.04 instance.
Make sure everything is up to date.
sudo apt-get update
Install NodeJS.
sudo apt-get install nodejs
sudo apt-get install npm
Install MongoDB - These steps are straight from MongoDB docs.
Choose whatever ve...
Server polling with AngularJS
...{
$scope.data = Data.query(function(){
$timeout(tick, 1000);
});
})();
};
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What does the line “#!/bin/sh” mean in a UNIX shell script?
...38
Joey
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answered Sep 9 '11 at 19:57
Marc BMarc B
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Create RegExps on the fly using string variables
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answered Dec 6 '10 at 22:27
meder omuralievmeder omuraliev
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std::shared_ptr thread safety explained
... only newly created object?
is incorrect. Only d will point to the new A(10), and a, b, and c will continue to point to the original A(1). This can be seen clearly in the following short example.
#include <memory>
#include <iostream>
using namespace std;
struct A
{
int a;
A(int a) ...
How to install Boost on Ubuntu
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880
You can use apt-get command (requires sudo)
sudo apt-get install libboost-all-dev
Or you can ...