大约有 42,000 项符合查询结果（耗时：0.0614秒） [XML]
How can I extract a good quality JPEG image from a video file with ffmpeg?
... -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.
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:
$ ...
What is a servicebus and when do I need one?
...s as the Ethernet of SOA.
First and foremost, it introduces a language of identifying things, like an IP address in Ethernet. This name isn't something inherently physical.
Next, you have something physical involved on each node, like a queue in the case of a bus for supporting semi-connected comm...
How to make git diff --ignore-space-change the default
...d Oct 24 '12 at 8:45
Burhan Khalid
144k1717 gold badges200200 silver badges247247 bronze badges
answered Oct 24 '12 at 8:21
...
How can I obtain an 'unbalanced' grid of ggplots?
With grid.arrange I can arrange multiple ggplot figures in a grid to achieve a multi-panel figure by using something like:
...
Extract substring using regexp in plain bash
...
Thanks for the detailed explanation, helps to avoid future "how do I regexp XXXX" posts.
– studgeek
Feb 8 '17 at 20:23
4
...
Node.js - Find home directory in platform agnostic way
...er on Cloud9 is not following my little tutorial (of course)... and had NO IDEA where to put my files. You are the man! (I assume)
– Steve
Aug 24 '13 at 8:28
...
How to convert a NumPy array to PIL image applying matplotlib colormap
...Apply the colormap directly to myarray" part cut straight to the heart! I didn't knew it was possible, thank you!
– heltonbiker
Jun 11 '12 at 2:26
...
HTML table td meaning
...t of knowing. See: w3schools.com/html/html_tables.asp - Table rows are divided into table data with the <td> tag.
– Gombat
Sep 20 '15 at 22:35
...
Do declared properties require a corresponding instance variable?
...ally declare an instance variable between the braces, or via @property outside the braces, or both. Either way, they become attributes of the class. The difference is that if you declare @property, then you can implement using @synthesize, which auto-codes your getter/setter for you. The auto-coder ...
Mockito match any class argument
...;) obj);
}
}
return false;
}
public void describeTo(Description desc) {
desc.appendText("Matches a class or subclass");
}
}
Phew! I'd go with the first option until you really need to get finer control over what method() actually returns :-)
...