这是一篇教程，目的是让读者能搭建出一个系统，可以在家中电脑、手机上或是其他位置，观看家中IPTV的直播节目，甚至可以手工选择录制节目。

0. 准备工作

你需要有下列硬件/软件以完成该教程。

• 家里的宽带有IPTV订阅，本文以广州电信IPTV为例
• 稍微高级一点的路由器，本文以Mikrotik的RB5009为例，但openwrt/LEDE之类的也可以
• 家中有一台常开的主机，本文以HP Gen 8 microserver为例，但树莓派4也可以
• Plex，需要有Pass订阅，emby和Jellyfin也可以
• 一定的网络知识和动手能力

1. 这样有什么好处

普通机顶盒，只能接在光猫上，因此只能在固定地点（例如客厅）的电视上看直播节目，而我们需要突破这个限制。

也有一些基于互联网电视的方案，可以支持用客户端观看，但基于互联网的直播会受网络带宽影响，画质较差，甚至在高峰期出现打不开的情况。而我们基于组播的方案不会受到这个影响。

虽然机顶盒支持一定天数的回放，但我们支持录制直播，多少算是弥补了这个短板。

Continue reading “IPTV” →

也就是说，我们可以改造出一种生物，它不会受到现有疾病的影响，但离开特定的非自然氨基酸就不能正常生活？
Hmm，听起来像一种奴隶制度。

Many of the fundamental features of life don’t necessarily have to be the way they are. Chance plays a major role in evolution, and there are always alternate paths that were never explored, simply because whatever evolved previously happened to be good enough. One instance of this idea is the genetic code, which converts the information carried by our DNA into the specific sequence of amino acids that form proteins. There are scores of potential amino acids, many of which can form spontaneously, but most life uses a genetic code that relies on just 20 of them.

Over the past couple of decades, scientists have shown that it doesn’t have to be that way. If you supply bacteria with the right enzyme and an alternative amino acid, they can use it. But bacteria won’t use the enzyme and amino acid very efficiently, as all the existing genetic code slots are already in use.

In a new work, researchers have managed to edit bacteria’s genetic code to free up a few new slots. They then filled those slots with unnatural amino acids, allowing the bacteria to produce proteins that would never be found in nature. One side effect of the reprogramming? No viruses could replicate in the modified bacteria.

Source: Researchers rewire the genetics of E. coli, make it virus-proof | Ars Technica