Video Voice App V2

A WebRTC voice and video app built with SvelteKit 2, Svelte 5, and Vite+. Users can create or join rooms for multi-party video calls with screen sharing, chat, and adaptive layouts. Signed-in users can also use a private live translation tool with streamed translated text and live translated voice playback.

Backend is handled by a separate signaling, room, auth-protected translation, and OpenAI-managed session service.

Stack

• Svelte 5
• SvelteKit 2
• Vite+ toolchain
• Tailwind CSS v4
• Native WebRTC media, data channels, and screen sharing
• OpenAI Realtime translation via backend-managed SDP session exchange
• Zod for validation

Features

Video Conferencing

• Lobby with active room list and live room updates
• Create-room and join-room flows
• Pre-join screen with device selection and mic level preview
• Multi-party audio/video calls
• Screen sharing
• In-call chat over WebRTC data channels
• Gallery and speaker layouts
• Reconnection handling and connection quality monitoring
• Theme support

Live Translation

• Signed-in-only private live translation sessions outside the video call flow
• Target language selector with source language auto-detection
• Streamed translated transcript display
• Live translated voice playback from the OpenAI Realtime WebRTC audio track
• Mute/unmute and browser autoplay fallback controls
• Stop cleanup for microphone, peer connection, data channel, and translated audio

Getting Started

Install vp from the Vite+ site:

curl -fsSL https://vite.plus | bash

Then install dependencies and start the dev server:

vp install
vp config
vp dev

Commands

Use vp as the common command interface for normal project workflows:

vp install       # install dependencies
vp dev           # run the dev server
vp check         # project checks through Vite+
vp test          # run tests
vp build         # build for production
vp preview       # preview the production build

For Svelte file checks and formatting, use the project's Svelte-specific commands:

vp dlx sv check
vp run fmt:sv