.NET Conf China 2022 .NET玩转音视频操作 FFmpeg 周杰 (来自长沙) Handshakes by DC Frontiers https://github.com/sdcb/Sdcb.FFmpeg 扫码下载代码示例和PPT .NET使用FFmpeg两类方法和相关库 命令行 • FFmpeg.NET • MediaToolkit • Xabe.Ffmpeg • 自己写 C API平台调用 • FFmpeg.AutoGen • EmguFFmpeg API的能力、保留跨平台的能力 删掉并重写了依赖ClangMacroParser，比原版支持更多的宏解析 动态库加载方式从手动LoadLibrary改为了自动的[DllImport]，这在.NET Core中可以自动从NuGet包中加载dll，这更符合.NET社区共识 除了底层封装，还提供了中层（类）封装和高层（帮助类）封装 简化了名字，如AVCodecID.AV_CODEC_ID_H264 -> AVCodecID

Electrical connections between sheets Hierarchical design examples Inspecting a schematic Find tool Net highlighting Cross-probing from the PCB 使用电气规则检查进行设计验证 Assigning Footprints Assigning Footprints selection. long click long click or long click or Clarify selection from a pop-up menu. Highlight the net of the selected copper item. The following modifier keys apply when dragging to perform a box selection: Highlight a net by marking its wires and net labels with a different color. If the PCB Editor is also open then copper corresponding to the selected net will be highlighted as well. Net highlighting

Shift Shift Shift Ctrl Shift Ctrl Shift Cmd Shift U Esc Esc 8 There are three ways to select a net or nets to highlight in the PCB editor: by using the hotkey after selecting a copper object, by Appearance panel. When you press the Highlight Net hotkey, the nets of any selected copper items will be highlighted. If no copper items are selected, the net of the copper item under the editor cursor hotkey + . When a net has been selected for highlighting, switches the highlighting on or off. Note: this button will be disabled when no net has been highlighted. To highlight a net, use the hotkey

schematics 层次原理图 简介 在设计中添加原理图 原理图之间导航器 原理图之间的电气连接 层次化设计实例 检查原理图 查找工具 Search panel 网络高亮显示 Net navigator 从 PCB 上交叉探测 电气规则检查 分配封装 在符号属性中分配封装 放置符号时分配封装 用封装分配工具分配封装 正向和反向批注 从原理图更新 PCB（正向批注） Highlight a net by marking its wires and net labels with a different color. If the PCB Editor is also open then copper corresponding to the selected net will be highlighted as well. Net highlighting highlighting can be cleared by clicking with the highlight tool in an empty space, or by using the Clear Net Highlighting hotkey ( ). Display the symbol selector dialog to place a new symbol. Display the power

介绍。 lr = 0.03 num_epochs = 3 net = linreg loss = squared_loss for epoch in range(num_epochs): for X, y in data_iter(batch_size, features, labels): l = loss(net(X, w, b), y) # X和y的小批量损失 # 因为l形状是(batch_size sum().backward() sgd([w, b], lr, batch_size) # 使用参数的梯度更新参数 with torch.no_grad(): train_l = loss(net(features, w, b), labels) print(f'epoch {epoch + 1}, loss {float(train_l.mean()):f}') 3.2. 线性回归的从零开始实现 要工程师花一个月的时间重新开始编写网页，那并不高效。 对于标准深度学习模型，我们可以使用框架的预定义好的层。这使我们只需关注使用哪些层来构造模型，而 不必关注层的实现细节。我们首先定义一个模型变量net，它是一个Sequential类的实例。Sequential类将多 个层串联在一起。当给定输入数据时，Sequential实例将数据传入到第一层，然后将第一层的输出作为第二 层的输入，以此类推。

Highlight a net by marking its wires and net labels with a different color. If the PCB Editor is also open then copper corresponding to the selected net will be highlighted as well. Net highlighting highlighting can be cleared by clicking with the highlight tool in an empty space, or by using the Clear Net Highlighting hotkey ( ). Display the symbol selector dialog to place a new symbol. Display the power sheet. For connections between two different sheets, use global or hierarchical labels. Place a net class directive label. Place a global label. All global labels with the same name are connected, even

可以激活网的高亮（见下 文）。 当网络高亮激活时，高亮的网或网将以较亮的颜色显示，所有其他项目将以比正常颜色更暗的颜色显示。 There are three ways to select a net or nets to highlight in the PCB editor: by using the hotkey after selecting a copper object, by Highlight Net hotkey, the nets of any selected copper items will be highlighted. If no copper items are selected, the net of the copper item under the editor cursor will be highlighted. Net highlighting can be cleared by using the Clear Net Highlight action (hotkey ) or by using the Highlight net tool on an empty region in the schematic. By default, also clears net highlighting, but this can be disabled

8.450, 1.950 ERC: Warning: BiDir Pin connected to power Pin (Net 6) @ 10.100, 3.300 ERC: Warning: Power Pin connected to BiDir Pin (Net 6) @ 4.950, 1.400 >> Errors ERC: 4 第 10 章 创建网络列表 10.1. 概述 网表是描述符号之间的电连接的文件。 Eeschema 运行插件，读取 test.tmp 并创建 test.net。 10.5.2. 命令行格式 下面是一个示例，使用 xsltproc.exe 作为转换 .xsl 文件的工具，使用文件 netlist_form_pads-pcb.xsl 作为转换表样式： f:/kicad/bin/xsltproc.exe -o %O.net f:/kicad/bin/plugins/netlist_form_pads- rm_pads- pcb.xsl %I 附： f:/kicad/bin/xsltproc.exe A tool to read and convert xsl file -o %O.net Output file: %O will define the output file. f:/kicad/bin/plugins/netlist_form_pads- pcb.xsl File name

8.450, 1.950 ERC: Warning: BiDir Pin connected to power Pin (Net 6) @ 10.100, 3.300 ERC: Warning: Power Pin connected to BiDir Pin (Net 6) @ 4.950, 1.400 >> Errors ERC: 4 Eeschema 简介 69 / 151 Chapter Eeschema 运行插件，读取 test.tmp 并创建 test.net。 10.5.2 命令行格式 下面是一个示例，使用 xsltproc.exe 作为转换.xsl 文件的工具，使用文件 netlist_form_pads-pcb.xsl 作为转换表样式： f:/kicad/bin/xsltproc.exe -o %O.net f:/kicad/bin/plugins/netlist_form_pads-pcb m_pads-pcb.xsl %I 附： f:/kicad/bin/xsltproc.exe A tool to read and convert xsl file -o %O.net Output file: %O will define the output file. f:/kicad/bin/plugins/netlist_form_pads-pcb.xsl File name converter

exists(p, [callback]) o path.existsSync(p)  net 网络模块 o net.createServer([options], [connectionListener]) o net.createConnection(arguments...) o net.Server  server.listen(port, [host], [callback])  server.connections  Event: 'connection' 事件：'connection'  Event: 'close' o net.Socket  new net.Socket([options])  socket.connect(port, [host], [callback])  socket.connect(path 事件：'drain'  Event: 'error' 事件：'error'  Event: 'close' 事件：'close' o net.isIP  net.isIP(input)  net.isIPv4(input)  net.isIPv6(input)  DNS DNS 模块 o dns.lookup(domain, family=null, callback)