bash 使用终端的 VLC 屏幕截图

VLC screen capture using terminal

提问by intl

I'm attempting to capture my screen as video and found VLC to probably be the best solution. What I have to do is capture a specific application using terminal and then stop the capture as well. Right now, I can capture using terminal with the following command:

我试图将我的屏幕捕获为视频，发现 VLC 可能是最好的解决方案。我要做的是使用终端捕获特定的应用程序，然后也停止捕获。现在，我可以使用终端使用以下命令进行捕获：

/Applications/VLC.app/Contents/MacOS/VLC -I dummy screen:// --screen-fps=25 --quiet --sout "#transcode{vcodec=h264,vb072}:standard{access=file,mux=mp4,dst="Desktop/vlc-output-terminal.mp4"}"

That's great, it works. The question is, how do I quit the recording using terminal? Right now, I'm having to do Control+Con the terminal to quit it. I've seen vlc://quitonline, but I'm not sure how to use that command.

太好了，它有效。问题是，如何使用终端退出录音？现在，我必须在终端上执行Control+C才能退出它。我在vlc://quit网上看到过，但我不确定如何使用该命令。

Also, does anyone know if it's possible to capture a specific application using VLC or is the whole screen the only option?

另外，有谁知道是否可以使用 VLC 捕获特定应用程序，还是整个屏幕是唯一的选择？

回答by P??x?L?

How to NOTquit when recording

录音时如何不退出

Ctrl+Ckill process (in this case VLC) with signal SIGINT.

Ctrl+C使用信号杀死进程（在本例中为 VLC）SIGINT。

vlc://quitoption will not work when you capture screen because stream is never-ending source.

vlc://quit捕获屏幕时选项将不起作用，因为流是永无止境的源。

---

---

Right way - RC (Remote Control)

正确的方式- RC（[R表情C ^ONTROL）

You can connect to your VLC using a TCP socketor a UNIX socket.

您可以使用 aTCP socket或 a连接到您的 VLC UNIX socket。

• TCP socket

  To be able to remote connect to your VLC using a TCP socket (telnet-like connetion), use --rc-host your_host:port. Then, by connecting (using telnet or netcat) to the host on the given port, you will get the command shell.

• UNIX socket

  To use a UNIX socket (local socket, this does not work for Windows), use --rc-unix /path/to/socket. Commands can then be passed using this UNIX socket.

• TCP套接字

  为了能够使用 TCP 套接字（类似于 telnet 的连接）远程连接到您的 VLC，请使用--rc-host your_host:port。然后，通过连接（使用 telnet 或 netcat）到给定端口上的主机，您将获得命令外壳。

• UNIX 套接字

  要使用 UNIX 套接字（本地套接字，这不适用于 Windows），请使用--rc-unix /path/to/socket。然后可以使用此 UNIX 套接字传递命令。

To enable remote controlinterface for VLC you will need to add options

要为 VLC启用远程控制界面，您需要添加选项

--extraintf rc --rc-quiet

---

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How to quit

如何戒烟

• TCP socket

  echo quit | nc your_host port

• UNIX socket

  echo quit | nc -U /path/to/socket

  ---

  Example

  1. Execute VLC

     vlc \
     screen:// --one-instance \
     -I dummy --dummy-quiet \
     --extraintf rc \
     --rc-host localhost:8082 \
     --rc-quiet \
     --screen-follow-mouse \
     --screen-mouse-image="mouse_pointer.png" \
     --screen-left=0 --screen-top=0 --screen-width=800 --screen-height=600 \
     --no-video :screen-fps=15 :screen-caching=300 \
     --sout "#transcode{vcodec=h264,vb=800,fps=5,scale=1,acodec=none}:duplicate{dst=std{access=file,mux=mp4,dst='/Videos/screen.mp4'}}"

  2. Gracefully shutdown VLC

     echo quit | nc localhost 8082

     You can also use Pythoncode below if you do not have nc (netcat)on your computer.

     import socket
     s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
     s.connect(('localhost', 8082))
     s.sendall('quit\n')
     s.shutdown(socket.SHUT_WR)

• TCP套接字

  回声退出 | nc your_host 端口

• UNIX 套接字

  回声退出 | nc -U /path/to/socket

  ---

  例子

  1. 执行 VLC

     vlc \
     screen:// --one-instance \
     -I dummy --dummy-quiet \
     --extraintf rc \
     --rc-host localhost:8082 \
     --rc-quiet \
     --screen-follow-mouse \
     --screen-mouse-image="mouse_pointer.png" \
     --screen-left=0 --screen-top=0 --screen-width=800 --screen-height=600 \
     --no-video :screen-fps=15 :screen-caching=300 \
     --sout "#transcode{vcodec=h264,vb=800,fps=5,scale=1,acodec=none}:duplicate{dst=std{access=file,mux=mp4,dst='/Videos/screen.mp4'}}"

  2. 正常关闭 VLC

     echo quit | nc localhost 8082

     Python如果您的计算机上没有nc (netcat)，您也可以使用下面的代码。

     import socket
     s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
     s.connect(('localhost', 8082))
     s.sendall('quit\n')
     s.shutdown(socket.SHUT_WR)

---

---

How to capture specific application

如何捕获特定应用程序

You can't select which application to record but you can specify coordinate, width and height of the subscreen.

您无法选择要录制的应用程序，但可以指定子屏幕的坐标、宽度和高度。

Options

选项

• --screen-top integerThe top edge coordinate of the subscreen. Default value: 0
• --screen-left integerThe left edge coordinate of the subscreen. Default value: 0
• --screen-width integerThe width of the subscreen. Default value: <full screen width>
• --screen-height integerThe height of the subscreen. Default value: <full screen height>

• --screen-top integer子屏幕的顶边坐标。默认值：0
• --screen-left integer子屏幕的左边缘坐标。默认值：0
• --screen-width integer子屏幕的宽度。默认值：<全屏宽度>
• --screen-height integer子屏幕的高度。默认值：<全屏高度>

回答by Khalil Gharbaoui

Screen captureon terminal or iterm on Mac OS 2019:

Mac OS 2019终端或 iterm 上的屏幕截图：

Add an alias to you .bashrcor .zshrcfor VLC:

为您.bashrc或.zshrcVLC添加别名：

alias vlc='/Applications/VLC.app/Contents/MacOS/VLC'

alias vlc='/Applications/VLC.app/Contents/MacOS/VLC'

Then add this function to your .bashrcor .zshrc:

然后将此函数添加到您的.bashrcor .zshrc：

screencapture(){
vlc \
-I dummy screen://\
--dummy-quiet \
--screen-follow-mouse \
--screen-mouse-image="/Users/YOUR_HOME_DIR/Desktop/awesome.jpg" \
--screen-left=0 --screen-top=0 --screen-width=1280 --screen-height=720 \
--no-video :screen-fps=15 :screen-caching=300 \
--sout "#transcode{vcodec=h264,vb=800,fps=5,scale=1,acodec=none}:duplicate{dst=std{access=file,mux=mp4,dst='/Users/YOUR_HOME_DIR/Desktop/Screencapture $(date +%Y-%m-%d) at $(date +%H.%M.%S).mp4'}}"
}

Open a new terminal session and do: screencapture

打开一个新的终端会话并执行： screencapture

When done do CTRl + Cto stop the function.

完成CTRl + C后停止该功能。

That's it find the files in your Desktop folder example:

这就是在您的桌面文件夹示例中找到文件：

Screencapture 2019-01-04 at 09.57.42.mp4

Screencapture 2019-01-04 at 09.57.42.mp4

Videos will be 1280x720 but you can customize this function however you like.

视频将为 1280x720，但您可以根据自己的喜好自定义此功能。

回答by Prashanth Adurugatla

Well there is a simple approach you don't need to deal with TCP sockets/Unix Sockets.

好吧，有一种简单的方法不需要处理TCP 套接字/Unix 套接字。

Step1:First open Vlc ->Tools ->Preferences Under Interface Tabmake sure you check "Allow only one Instance".

步骤 1：首先打开 Vlc -> 工具 ->界面选项卡下的首选项，确保选中“仅允许一个实例”。

If you don't find it using above method then search for instancein Advance Preference TabThen check Allow only one instance.

如果您没有使用上述方法找到它，则在“高级首选项”选项卡中搜索实例， 然后选中“仅允许一个实例”。

This helps you to prevent starting new recording and it allows you to keep track the existing recording.

这有助于您防止开始新的录音，并允许您跟踪现有的录音。

Step2:To start Recording use this command

步骤 2：要开始录制，请使用此命令

vlc screen:// --qt-start-minimized :screen-fps=5 :run-time=30 :quiet :sout=#transcode{vcodec=h264,vb072}:standard{access=file,mux=mp4,dst="C:\Users\**admin**\Desktop\screencast.mp4"}

Step3:To save and Stop the existing record use

Step3：保存和停止现有记录使用

vlc://quit

Note: Make sure to check the path before you use this commands

注意：使用此命令前请务必检查路径

回答by NetworkSys Co. Ltd

Important if you're on windows:

重要的是，如果你在 Windows 上：

,... --rc-host localhost:8082

Doesn't work you'Ve to use local host ip otherwise it won't work. Use 127.0.0.1 instead:

不起作用，您必须使用本地主机 ip，否则它将不起作用。使用 127.0.0.1 代替：

,... --rc-host 127.0.0.1:8082

回答by user2462619

I had to change quit command on my machine (WIN 10):

我不得不在我的机器上更改退出命令（WIN 10）：

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(('127.0.0.1', 8082))
s.sendall('quit\n'.encode())
s.shutdown(socket.SHUT_WR)