大约有 46,000 项符合查询结果（耗时：0.0511秒） [XML]
How can I extract a good quality JPEG image from a video file with ffmpeg?
...
Use -qscale:v to control quality
Use -qscale:v (or the alias -q:v) as an output option.
Normal range for JPEG is 2-31 with 31 being the worst quality.
The scale is linear with double the qscale being roughly half the bitrate.
Recommend trying values of ...
What is the best algorithm for overriding GetHashCode?
... in a lot of places throughout the .NET base class libraries. Implementing it properly is especially important to find items quickly in a collection or when determining equality.
...
Detect if Visual C++ Redistributable for Visual Studio 2012 is installed
...
It depends on what version you are using. These two 2012 keys have worked well for me with their corresponding versions to download for Update 4. Please be aware that some of these reg locations may be OS-dependent. I collect...
Rails render partial with block
I'm trying to re-use an html component that i've written that provides panel styling. Something like:
5 Answers
...
How can I generate Unix timestamps?
...follow
|
edited Aug 23 '18 at 1:47
community wiki
...
How to completely remove a dialog on close
When an ajax operation fails, I create a new div with the errors and then show it as a dialog. When the dialog is closed I would like to completely destroy and remove the div again. How can I do this? My code looks something like this at the moment:
...
MySQL Orderby a number, Nulls last
...x to sort nulls last. Place a minus sign (-) before the column name and switch the ASC to DESC:
SELECT * FROM tablename WHERE visible=1 ORDER BY -position DESC, id DESC
It is essentially the inverse of position DESC placing the NULL values last but otherwise the same as position ASC.
A good ref...
How to delete migration files in Rails 3
...:migrate again.
If your application is already on production or staging, it's safer to just write another migration that destroys your table or columns.
Another great reference for migrations is: http://guides.rubyonrails.org/migrations.html
...
Can an enum class be converted to the underlying type?
...type to know the underlying type, and then use cast:
#include <type_traits> //for std::underlying_type
typedef std::underlying_type<my_fields>::type utype;
utype a = static_cast<utype>(my_fields::field);
With this, you don't have to assume the underlying type, or you don't hav...
How to pass parameters to ThreadStart method in Thread?
... that you can pass multiple parameters, and you get compile-time checking without needing to cast from object all the time.
share
|
improve this answer
|
follow
...