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Fastest way to extract frames using ffmpeg?
...is is 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 -fp...
node.js hash string?
... If I have lots of strings to hash, it is less efficient to keep calling crypto.createHash instead of somehow re-using the result?
– Michael
Mar 28 '19 at 3:23
add a ...
Is it possible to use JavaScript to change the meta-tags of the page?
...lector('meta[name=theme-color]'); meta.setAttribute("content", colors[slideIndex]); Chrome on Android detects the update and changes the color
– Dominic Bartl
Dec 20 '18 at 10:00
...
How can I use an array of function pointers?
...one of those function pointers:
result = (*p[op]) (i, j); // op being the index of one of the four functions
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Reading specific lines only
... understand the meaning of big file. The loop will take years to reach the index
– devssh
Jun 6 '18 at 10:27
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Run cron job only if it isn't already running
...'s just a shell script:
#!/bin/sh
if ps -ef | grep -v grep | grep doctype.php ; then
exit 0
else
/home/user/bin/doctype.php >> /home/user/bin/spooler.log &
#mailing program
/home/user/bin/simplemail.php "Print spooler was not running... Restarted."
...
Mongoose's find method with $or condition does not work properly
...
According to mongoDB documentation: "...That is, for MongoDB to use indexes to evaluate an $or expression, all the clauses in the $or expression must be supported by indexes."
So add indexes for your other fields and it will work. I had a similar problem and this solved it.
You can read m...
Search for all files in project containing the text 'querystring' in Eclipse
...rk in Dreamweaver and Eclipse when developing. I think Dreamweaver has a really nice search where you can search for text within all files of your current project.
...
Best practices with STDIN in Ruby?
...le that gets all input from named files or all from STDIN.
ARGF.each_with_index do |line, idx|
print ARGF.filename, ":", idx, ";", line
end
# print all the lines in every file passed via command line that contains login
ARGF.each do |line|
puts line if line =~ /login/
end
Thank goodness ...
Ignore python multiple return value
...g to a variable and then not using it? The function is returning a tuple; index it like a tuple.
– endolith
Mar 26 '13 at 14:41