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How can I extract a good quality JPEG image from a video file with ffmpeg?
...v 4 -frames:v 1 output.jpg
This will work with any video input. See below if your input is MJPEG.
MJPEG
If your input is MJPEG (Motion JPEG) then the images can be extracted without any quality loss.
The ffmpeg or ffprobe console output can tell you if your input is MJPEG:
$ ffprobe -v error -sele...
Wait until a process ends
...ee the MSDN page for the method. It also has an overload where you can specify the timeout, so you're not potentially waiting forever.
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In PHP, how to detect the execution is from CLI mode or through browser ? [duplicate]
...
Use the php_sapi_name() function.
if (php_sapi_name() == "cli") {
// In cli-mode
} else {
// Not in cli-mode
}
Here are some relevant notes from the docs:
php_sapi_name — Returns the type of interface between web server and PHP
Although n...
How do I protect Python code? [closed]
... you use a exe-packager like py2exe, the layout of the executable is well-known, and the Python byte-codes are well understood.
Usually in cases like this, you have to make a tradeoff. How important is it really to protect the code? Are there real secrets in there (such as a key for symmetric enc...
Spring .properties file: get element as an Array
...
If you define your array in properties file like:
base.module.elementToSearch=1,2,3,4,5,6
You can load such array in your Java class like this:
@Value("${base.module.elementToSearch}")
private String[] elementToSearch...
Regex doesn't work in String.matches()
...tches ALL the input. Unfortunately, other languages have followed suit :(
If you want to see if the regex matches an input text, use a Pattern, a Matcher and the .find() method of the matcher:
Pattern p = Pattern.compile("[a-z]");
Matcher m = p.matcher(inputstring);
if (m.find())
// match
If...
Creating folders inside a GitHub repository without using Git
... the file name to create the file within that new directory.
For example, if I would like to create the file filename.md in a series of sub-folders, I can do this (taken from the GitHub blog):
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gdb: how to print the current line or find the current line number?
...sing most common register rip nowadays, replace with eip or very rarely ip if needed):
(gdb)info line *$rip
will show you line number and file source
(gdb) list *$rip
will show you that line with a few before and after
but probably
(gdb) frame
should be enough in many cases.
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What are the differences between a HashMap and a Hashtable in Java?
...r @aberrant80 or an admin by flagging. Flagging could help - will try that now.
– anon58192932
Oct 14 '16 at 20:05
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How do I execute a command and get the output of the command within C++ using POSIX?
..._ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
if (!pipe) {
throw std::runtime_error("popen() failed!");
}
while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
result += buffer.data();
}
return result;
}
Pre-C++11 version:...