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How to use WPF Background Worker
...gress (optional, but often useful)
a) subscribe to ProgressChanged event and use ReportProgress(Int32) in DoWork
b) set worker.WorkerReportsProgress = true; (credits to @zagy)
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Fastest way to extract frames using ffmpeg?
...about 20 times faster. We use fast seeking to go to the desired time index and extract a frame, then call ffmpeg several times for every time index. Note that -accurate_seek is the default
, and make sure you add -ss before the input video -i option.
Note that it's better to use -filter:v -fps=fps=...
Android Preferences: How to load the default values when the user hasn't used the preferences-screen
...s(this, R.xml.preference, false);
It will load your preferences from XML, and last parameter (readAgain) will guarantee that user preferences won't be overwritten. That means setting the readAgain argument to false means this will only set the default values if this method has never been called in ...
CSS Selector that applies to elements with two classes
...out a space in between):
.foo.bar {
/* Styles for element(s) with foo AND bar classes */
}
If you still have to deal with ancient browsers like IE6, be aware that it doesn't read chained class selectors correctly: it'll only read the last class selector (.bar in this case) instead, regardle...
Cannot simply use PostgreSQL table name (“relation does not exist”)
...One common reason is that the table is defined with a mixed-case spelling, and you're trying to query it with all lower-case.
In other words, the following fails:
CREATE TABLE "SF_Bands" ( ... );
SELECT * FROM sf_bands; -- ERROR!
Use double-quotes to delimit identifiers so you can use the spec...
Entity Framework - Include Multiple Levels of Properties
...ided seems to provide the answer. Let me try this: To include a collection and then a collection one level down: query.Include(e => e.Level1Collection.Select(l1 => l1.Level2Collection)).
– Bob Horn
May 30 '12 at 19:46
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How to get the tag HTML with JavaScript / jQuery?
...Name("html")[0];
or
var htmlElement = document.querySelector("html");
And if you want to use jQuery to get attributes from it...
$(htmlElement).attr(INSERT-ATTRIBUTE-NAME);
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Change from SQLite to PostgreSQL in a fresh Rails project
I have a rails app that's databases are in SQLite (The dev and production). Since I am moving to heroku, I want to convert my database to PostgreSQL.
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How to clear ostringstream [duplicate]
...them, then you don't need to call clear().
Usually it is easier, cleaner, and more straightforward (straightforwarder?) just to use a new std::ostringstream object instead of reusing an existing one, unless the code is used in a known performance hot spot.
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How do you calculate program run time in python? [duplicate]
.../profile/index.html
http://www.doughellmann.com/PyMOTW/timeit/index.html
And the time module also might come in handy, although I prefer the later two recommendations for benchmarking and profiling code performance:
http://docs.python.org/library/time.html
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