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Fastest way to extract frames using ffmpeg?
...eq(n\,800)+eq(n\,1000)' \
-vsync vfr -q:v 2
I'm using this with a pipe to Imagemagick's montage to get 10 frames preview from any videos. Obviously the frame numbers you'll need to figure out using ffprobe
ffmpeg -i myVideo.mov -vf \
select='eq(n\,1)+eq(n\,200)+eq(n\,400)+eq(n\,600)+eq...
Create a tar.xz in one command
...ormat. The output of this operation is generated on the standard output.
| pipes standard output to the input of another program...
... which happens to be xz -z -. XZ is configured to compress (-z) the archive from standard input (-).
You redirect the output from xz to the tar.xz file.
...
How to escape indicator characters (i.e. : or - ) in YAML
..., multiline texts, is putting your text indented on the next line, after a pipe or greater-than sign:
text: >
Op dit plein stond het hoofdkantoor van de NIROM: Nederlands Indische
Radio Omroep
A pipe preserves newlines, a gt-sign turns all the following lines into one long string.
...
How to “grep” for a filename instead of the contents of a file?
...s Pablo said, you need to use find instead of grep, but there's no need to pipe find to grep. find has that functionality built in:
find . -regex 'f[[:alnum:]]\.frm'
find is a very powerful program for searching for files by name and supports searching by file type, depth limiting, combining diff...
UnicodeDecodeError when redirecting to file
... strings that only contain ASCII characters.
However, when you redirect or pipe the output of your program, then it is generally not possible to know what the input encoding of the receiving program is, and the above code returns some default encoding: None (Python 2.7) or UTF-8 (Python 3):
% python...
VS2012警告未能加载包“Visual C++ package” - C/C++ - 清泛网 - 专注C/C++及内核技术
...加载包“Visual C++ package”安装了windows更新后就出现VS2012无法打开项目的问题，还报各种加载失败。解决方法：到微软官网下载VS2012更新KB2781514，大概1.12MB链接地...安装了windows更新后就出现VS2012无法打开项目的问题，报加载失败...
cgridctrl 单元格下拉，单元格事件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...数据进行联动，但是这个下拉框是一个CGridCellCombo对象，无法直接为它绑定事件。这时我们可...
cgridctrl单元格下拉框选中后，需要根据选中的数据进行联动，但是这个下拉框是一个CGridCellCombo对象，无法直接为它绑定事件。这时...
如何获取IE (控件)的所有链接（包括Frameset, iframe） - C/C++ - 清泛网 -...
...Frameset, iframe）IE 顶层 body 节点通过IHTMLElement->get_all 方法无法获取iframe 里面的节点列表：CComPtr<IHTMLElement> body;...CComPtr<IDispatc...IE 顶层 body 节点通过IHTMLElement->get_all 方法无法获取iframe 里面的节点列表：
CComPtr<IHTMLElement> body;
......
Linux将一个程序变成后台进程转入后台运行 - C/C++ - 清泛网 - 专注C/C++及内核技术
...当我们. xxx运行程序时，由于程序没有退出，终端被阻塞无法继续...问题现象：
Linux下写了一个无限循环处理的程序（类似Linux守护进程），不过当我们./xxx运行程序时，由于程序没有退出，终端被阻塞无法继续输入，Ctrl + C将会...
CListCtrl 如何设置单元格颜色？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...颜色？CListCtrl默认可设置的内容很少，如单元格颜色默认无法设置。若想设置单元格颜色，需要对CListCtrl进行拓展，已有老外为我们写好demo，这里...CListCtrl默认可设置的内容很少，如单元格颜色默认无法设置。若想设置单元格...