@danenja · X

Unrot the brain. Build a robot.

lisheng3698 · V2EX

我把摄像头变成了乐器：从手势识别到 Web Audio，分享 5 个真正踩过的坑 最近做了一个有点不一样的浏览器小项目：用摄像头识别双手动作，再把手的位置和姿势映射成和弦、音高、音量和音色。 不需要安装软件，也不需要麦克风。打开网页、允许摄像头后，就可以隔空演奏。 项目地址：[GestureSynth.me]( https://gesturesynth.me/) 建议使用最新版 Chrome 或 Edge 。摄像头画面只在本地处理，不会上传。 ## 真正难的不是“识别到手” 最开始我以为，只要 MediaPipe 能返回手部关键点，剩下的事情就是把坐标转换成音符。 实际做下来发现：**识别出一只手很容易，让它变成一个“能演奏”的控制器才难。** 摄像头每一帧都会返回一组手部关键点，但这些坐标会轻微抖动，偶尔还会丢失。如果直接把原始坐标连接到音高或者音量，听起来会非常不稳定。 最后形成的处理链路大致是： ```text 摄像头 → 手部关键点识别 → 提取手掌位置、距离和手势 → 平滑、死区和状态保持 → 映

@BlueDinosaurAI · X

Perfect prompt. Productivity booster.

@Z0D404 · X

I built this trendy site inspired by @ybhrdwj , @s4tr2, and others; all credit goes to them. This is pretty much vibe-coded. I have also added my region bus uncle's playlist😎; check it out. Website:

u/Bholenaught · Reddit

Took us about 4 failed ideas and over 18 months.We made an email marketing platform. Alternative to Mailchimp, beehiv, kit, Klaviyo. It's called Bluey Email. Took us about 4 failed ideas and over 18 months; we started with a personalized AI chatbot. This was the beginning of the ChatGPT era, and we thought we could help people train the AI to reflect the behavior of loved ones they had lost. It was a Black Mirror kinda idea, and my therapist friends said it's not okay, so we ditched it. T

zhw2590582 · V2EX

最近对网站进行了重构，做成了免费的视频工具站：[ArtPlayer Tools]( https://artplayer.org/tools/) 主要是围绕着 ffmpeg.wasm 和 mediabunny 实现的一些可以直接在浏览器里用的视频/音频工具，常用的有： - 视频压缩：[Compress Video]( https://artplayer.org/compress-video/) - 视频裁剪：[Crop Video]( https://artplayer.org/crop-video/) - 视频合并：[Merge Video]( https://artplayer.org/merge-video/) - 视频尺寸调整：[Resize Video]( https://artplayer.org/resize-video/) - 视频旋转：[Rotate Video]( https://artplayer.org/rotate-video/) - 视频调速：[Change Video Speed]( https://artplayer.org/change-video-speed/) - 添加文字到视频：[Add Text to Video]( https://artplayer.org/add-text-to-video/) - 添加水印：[Watermark Video]( https://artplayer.org/watermark-video/) - 提取字幕：[Subtitle Editor]( https://artplayer.org/subtitle-editor/) - HLS 转 MP4：[HLS to MP4]( https://artplayer.org/hls-to-mp4/) - 音频可视化：[Audio Visualizer]( https://artplayer.org/audio-visualizer/) 大部分工具都是本地处理，文件不会上传到服务器。最开始是因为自己偶尔要处理一些视频，开剪辑软件又有点重，在线工具又担心隐私，所以就慢慢做成了一个站。 目前还在持续完善，体验肯定还有不少粗糙的地方，比如不同浏览器的兼容、移动端操作、长视频性能之类的。 网站： [ArtPlayer Tools]( https:

@factfile0 · X

@pomodial · X

Phone-free focus: Just shipped something no other Pomodoro timer has. Scan a QR code on your phone. Lock it. Focus. PomoDial tracks how many times you picked it up during your session. Phone distractions: 0 🔒 #buildinpublic

@NodeESP · X

- Project for sale