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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...
Prevent wrapping of span or div
...white-space: nowrap;
}
.slide {
display: inline-block;
width: 600px;
white-space: normal;
}
<div class="slideContainer">
<span class="slide">Some content</span>
<span class="slide">More content. Lorem ipsum dolor sit amet, consectetur adipisicing ...
Is there an “exists” function for jQuery?
...
2520
In JavaScript, everything is 'truthy' or 'falsy', and for numbers 0 means false, everything else...
Generate list of all possible permutations of a string
...
70
There are several ways to do this. Common methods use recursion, memoization, or dynamic program...
Python Pandas: Get index of rows which column matches certain value
...[i] returns the ith row of df. i does not refer to the index label, i is a 0-based index.
In contrast, the attribute index returns actual index labels, not numeric row-indices:
df.index[df['BoolCol'] == True].tolist()
or equivalently,
df.index[df['BoolCol']].tolist()
You can see the differenc...
Is it possible to disable floating headers in UITableView with UITableViewStylePlain?
... |
edited Dec 8 '16 at 21:05
shim
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answered Jul 2...
Replace one character with another in Bash
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405
Use inline shell string replacement. Example:
foo=" "
# replace first blank only
bar=${foo/ ...
.NET 4.0 build issues on CI server
Anybody manage to get .NET 4.0 applications compiling on a CI server without installing Visual Studio 2010 on a CI server?
...
Inserting code in this LaTeX document with indentation
...t}):
\usepackage{listings}
\usepackage{color}
\definecolor{dkgreen}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.5,0.5,0.5}
\definecolor{mauve}{rgb}{0.58,0,0.82}
\lstset{frame=tb,
language=Java,
aboveskip=3mm,
belowskip=3mm,
showstringspaces=false,
columns=flexible,
basicstyle={\small\ttfa...
Drop multiple tables in one shot in mysql
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Leniel MaccaferriLeniel Maccaferri
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...