jdhao's digital space

In order to get enough information from videos, we often need to extract video frames.

When downloading files using Safari browser in iPad, the files will be saved on your iCloud drive.

In my old post, I have shared how to use pybind11 to accelerate execution of Python code.

I have a file where each line has several comma-separated items.

When dealing with videos, we may want to process video in a specific time range, for example, to only process video from 50 seconds to 70 seconds.

科技发展的这样快，常常让我们忘了以前是什么样的。

在苹果系统上安装一个工具真麻烦，简单总结如何在 iPad 上安装 Shadowrocket 小火箭。

About five months ago, the biggest update of Nvim comes with its v0.5.0 release.

In this post-web2.0 age, people seem to blog less and less, and blogs seem to be dying slowly.

My Git learning notes.

This is the 11th post of my post series on nifty Nvim/Vim techniques that will make my editing experience easier.

During my work, I use multiple Tmux sessions to manage different projects.

我平时用 chrome 浏览器，有时候查一个新东西，喜欢把有关系的网页都打开，所以浏览器就塞满了 tab，这些内容我不一定都有时间去看一遍，所以 tab 就一直留在那里，有时候不得已要重启浏览器或者重启系统，不想丢失这些 tab，就用 supertabs 插件把 tab 保存下来，期望有时间了再去看。

kindle voyage 看 PDF 格式电子书体验太差，正好八月份小米发布了小米平板 5 pro，小米平板 5 销售还挺火爆的，京东上一直断货，需要预约，遂从小米之家入手一台体验1。

Collected tips on audio processing with FFmpeg.

ffmpeg is an excellent tool for video processing.

花了一周的时间，看完了茅海建的《天朝的崩溃》，虽然中学历史书中简略讲过第一次鸦片战争，对这段历史了解却甚少，我甚至天真地以为鸦片战争就是虎门战争之后就和谈了，然后签订了《南京条约》。

Diff can be used to compare two versions of the same file to find the changes.

When we run git-diff, git uses its internal diff algorithm to generate diff for changed files.

Sometimes, we are interested in which font is used for the main text in a PDF.

In Python, to run a task periodically, we can use the package apscheduler.

In classification tasks, the de facto loss to use is the cross entropy loss.

Unlike Vim/Neovim, where there are snippet engines like ultisnips and other plugins.

A short note on how to set up a more beautiful tabline for Emacs.

趁着中秋节小长假，去重庆和贵阳玩了几天。

update log 2022-02-08: update fastgit URL I am using straight.el to manage my Emacs packages.

update log 2021-11-24: Add more detailed instructions for installing doom-modeline.

If you are not accustomed to typing git commands on the command line, there are also some TUI clients for easing the use of git.

In Neovim, we can use the virtual text feature to place virtual text anywhere in the current buffer, which is not possible with normal text.

总结一下老北京炸酱面的制作过程，备忘。

I want to print the largest number that unsigned int can represent, which is 2^32 - 1.

GNU Make is a build automation tool typically used on Linux systems1.

一件关于思维的小事，值得记录。

To accelerate the execution of some performance critical code, we can write the code in C++ with the help of pybind11 and export the C++ code as shared library1.

建立博客以来，试用了多款评论系统，不过最终还是用了 disqus，但是 disqus 令人讨厌的是默认添加很多烦人的广告，牛皮癣一样，而且在国内无法加载，必须翻墙才能显示。

Some permission related issue on macOS.

Update log 2022-08-13: update nvim lsp config for lua-language-server.

update: On 2021-11-28, we expericence another GitHub outage which lasts more than two hours, see here.

点击查看更新记录 2022-03-07：增加 shotrr 2022-02-10: 增加 wezterm 介绍 记录我在 macOS 下常用到的工具。

After updating my Windows system to the latest version, I can finally use the new Windows Terminal.

Google introduced the content ID system in 2007 to cope with the unauthorized use of copyrighted music and video content.

基于内容的视频检索（或视频指纹），是指根据视频内容，从数据库中找到和当前视频在画面上重复高的视频。

无论是推荐还是检索任务，都离不开向量检索引擎，当向量数量巨大(上千万或者上亿规模)的时候，使用精确搜索(exhaustive search)的时间成本对于用户来说无法接受，这时我们必须用到近似最邻近搜索（approximate nearest neighbor, 简称 ANN)。

I saw on YouTube a video made by TJ DeVries on how to contribute to the neovim project.

We have a Python web service where we store some key-val pairs in redis.

Update log 2022-03-27: fix a typo in requiring lua modules 2022-02-08: change fastgit URL 2022-02-05: add new autocmd for auto-running command PackerCompile.

快排是一种快速排序算法，原理是从数组中选择一个 pivot，数组中小于等于 pivot 的元素放到左边，大于 pivot 的元素放到右边。

I use Python in my work, and rarely need C++.

In C++, we can build a library either statically or dynamically.