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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=...
Why does Math.round(0.49999999999999994) return 1?
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Summary
In Java 6 (and presumably earlier), round(x) is implemented as floor(x+0.5).1 This is a specification bug, for precisely this one pathological case.2 Java 7 no longer mandates this broken implementation.3
The problem
0.5+0.49999999...
What does 'predicate' mean in the context of computer science? [duplicate]
...ies a boolean function, i.e. a predicate.
– Dimitris Andreou
Jul 24 '10 at 17:25
7
This is used i...
How can I respond to the width of an auto-sized DOM element in React?
I have a complex web page using React components, and am trying to convert the page from a static layout to a more responsive, resizable layout. However, I keep running into limitations with React, and am wondering if there's a standard pattern for handling these issues. In my specific case, I have ...
How to pass table value parameters to stored procedure from .net code
...meters that I pass to a stored proc as an nvarchar (separated by commas) and internally divide into single values. I add it to the SQL command parameters list like this:
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Reverse of JSON.stringify?
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JSON.stringify and JSON.parse are almost oposites, and "usually" this kind of thing will work:
var obj = ...;
var json = JSON.stringify(obj);
var obj2 = JSON.parse(json);
so that obj and obj2 are "the same".
However there are some lim...
Change the name of a key in dictionary
...that this would also affect the position of the key in CPython 3.6+ / Pypy and Python 3.7+. That is in general the position of old_key will be different from the position of new_key.
– norok2
Jan 24 at 20:16
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Equivalent of Math.Min & Math.Max for Dates?
What's the quickest and easiest way to get the Min (or Max) value between two dates? Is there an equivalent to Math.Min (& Math.Max) for dates?
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What is the difference between class and instance attributes?
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Only the mutable types are shared. Like for int and str they still attached with each instances rather than class.
– Babu
Jul 17 '14 at 11:59
11
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Change date format in a Java string
...e. Read the java.text.SimpleDateFormat javadoc what the individual parts stands for. So stands for example M for months and m for minutes. Also, years exist of four digits yyyy, not five yyyyy. Look closer at the code snippets I posted here above.
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