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How can I extract a good quality JPEG image from a video file with ffmpeg?
...put.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 video input. See below if your input is MJPEG.
MJ...
Rails server says port already used, how to kill that process?
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Given a number, find the next higher number which has the exact same set of digits as the original n
...ch can be placed in the correct place in O(n)).
An example will make this more clear:
123456784987654321
start with a number
123456784 987654321
^the first place from the right where the left-digit is less than the right
Digit "x" is 4
123456784 987654321
^find...
How do I parse command line arguments in Bash?
...s that are empty strings
can't handle arguments with embedded whitespace
More recent getopt versions don't have these limitations.
Additionally, the POSIX shell (and others) offer getopts which doesn't have these limitations. I've included a simplistic getopts example.
Usage demo-getopts.sh -vf ...
Reading CSV files using C#
... }
}
}
It works great for me in my C# projects.
Here are some more links/informations:
MSDN: Read From Comma-Delimited Text Files in Visual Basic
MSDN: TextFieldParser Class
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Download a file from NodeJS Server using Express
...r is concerned, the file's name is just 'download', so you need to give it more info by using another HTTP header.
res.setHeader('Content-disposition', 'attachment; filename=dramaticpenguin.MOV');
You may also want to send a mime-type such as this:
res.setHeader('Content-type', 'video/quicktime'...
pass post data with window.location.href
...r: no. window.location.href is not capable of passing POST data.
Somewhat more satisfying answer: You can use this function to clone all your form data and submit it.
var submitMe = document.createElement("form");
submitMe.action = "YOUR_URL_HERE"; // Remember to change me
submitMe.method = "post"...
Finding the number of days between two dates
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Partly cherry-picking a commit with Git
...d allow you to apply hunks from that diff individually. This option may be more useful if the commit you're pulling in has merge conflicts in part of the commit you're not interested in. (Note, however, that checkout differs from cherry-pick: checkout tries to apply <commit>'s contents entirel...
CORS: Cannot use wildcard in Access-Control-Allow-Origin when credentials flag is true
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But what if there's more than one domain?
– aroth
Oct 8 '14 at 0:57
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