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Crop MP3 to first 30 seconds
...and it also takes longer to do.
Here's a command line that will slice to 30 seconds without transcoding:
ffmpeg -t 30 -i inputfile.mp3 -acodec copy outputfile.mp3
The -acodec switch tells ffmpeg to use the special "copy" codec which does not transcode. It is lightning fast.
NOTE: the command w...
How can I create and style a div using JavaScript?
...
var div = document.createElement("div");
div.style.width = "100px";
div.style.height = "100px";
div.style.background = "red";
div.style.color = "white";
div.innerHTML = "Hello";
document.getElementById("main").appendChild(div);
<body>
<div id="main"></div>
&...
Arduino 101 平台 · App Inventor 2 中文网
... 搜索 Arduino 101 平台 « 返回首页 Iot 专题
平台: Arduino 101
Arduino 101 是基于 Intel® Curie™ 芯片组的流行 Arduino 平台的一个版本。它具有...
Number of days between two dates in Joda-Time
...e places), which Days.daysBetween doesn't handle properly.
// 5am on the 20th to 1pm on the 21st, October 2013, Brazil
DateTimeZone BRAZIL = DateTimeZone.forID("America/Sao_Paulo");
DateTime start = new DateTime(2013, 10, 20, 5, 0, 0, BRAZIL);
DateTime end = new DateTime(2013, 10, 21, 13, 0, 0, BRA...
转：postfix安装Q&A - 更多技术 - 清泛网 - 专注C/C++及内核技术
...tfix安装Q&A 原文地址：http: bbs.chinaunix.net viewthread.php?tid=770141执照wangmingda老大的资料安装成功postfix（地址在这里http: www.extmail....
原文地址：http://bbs.chinaunix.net/viewthread.php?tid=770141
执照wangmingda老大的资料...
鸿蒙创新能力测试流程 · App Inventor 2 中文网
...构建稳定。
建议步骤：
先调用 SetStateValue("accent", "#0F62FE")
再调用 SetStateValue("deviceCount", "3")
调用 BuildCardModel(...)
调用 BuildContinuationCommand(...)
查看 GetLastPayload()
检查点：
返回 JSON 中应有 protocol 与 kind。
状态字段...
Find the division remainder of a number
... it might not be what you would expect when talking about the remainder: -10 % 3 == 2. However a/b*b + a%b == a still holds true, since python always rounds towards -Infinity, unlike some other languages, which round towards 0 but would return -1.
– marcelj
Oct...
What is the logic behind the “using” keyword in C++?
...
120
In C++11, the using keyword when used for type alias is identical to typedef.
7.1.3.2
A typedef...
Getting the exception value in Python
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340
use str
try:
some_method()
except Exception as e:
s = str(e)
Also, most exception cla...
How can I split a comma delimited string into an array in PHP?
...
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