--- format: typebulb/v1 name: ffmpeg AI --- **code.tsx** ```tsx import React, { useState, useRef, useEffect } from "react"; import { createRoot } from "react-dom/client"; import { FFmpeg } from "@ffmpeg/ffmpeg"; import { fetchFile } from "@ffmpeg/util"; interface FFmpegInsight { command: string; explanation: string; outputFilename: string; outputMimeType: string; } const App = () => { const [loaded, setLoaded] = useState(false); const [loading, setLoading] = useState(true); const [processing, setProcessing] = useState(false); const [log, setLog] = useState(["Initializing..."]); const [inputFile, setInputFile] = useState(null); const [inputUrl, setInputUrl] = useState(null); const [outputUrl, setOutputUrl] = useState(null); const [outputMime, setOutputMime] = useState("video/mp4"); const [outputName, setOutputName] = useState("output.mp4"); const [duration, setDuration] = useState(0); const [currentTime, setCurrentTime] = useState(0); const [command, setCommand] = useState("-ss {time} -i {input} -t 3 -c copy {output}"); const [explanation, setExplanation] = useState(null); const ffmpegRef = useRef(new FFmpeg()); const videoRef = useRef(null); const addLog = (msg: string) => setLog(prev => [...prev, msg]); useEffect(() => { const saved = tb.insight(); if (saved) { setCommand(saved.command); setExplanation(saved.explanation); setOutputName(saved.outputFilename || "output.mp4"); setOutputMime(saved.outputMimeType || "video/mp4"); } }, []); useEffect(() => { const load = async () => { const ffmpeg = ffmpegRef.current; ffmpeg.on("log", ({ message }) => addLog(message)); try { addLog("Loading FFmpeg WASM..."); await ffmpeg.load({ coreURL: tb.proxy("https://unpkg.com/@ffmpeg/core@0.12.6/dist/esm/ffmpeg-core.js"), wasmURL: tb.proxy("https://unpkg.com/@ffmpeg/core@0.12.6/dist/esm/ffmpeg-core.wasm"), classWorkerURL: tb.proxy("https://unpkg.com/@ffmpeg/ffmpeg@0.12.15/dist/esm/worker.js"), }); addLog("FFmpeg loaded successfully!"); setLoaded(true); } catch (err) { addLog(`Error loading FFmpeg: ${err}`); } setLoading(false); }; load(); }, []); const handleFileChange = (e: React.ChangeEvent) => { const file = e.target.files?.[0] ?? null; setInputFile(file); if (file) { addLog(`Selected: ${file.name}`); setInputUrl(URL.createObjectURL(file)); } if (outputUrl) URL.revokeObjectURL(outputUrl); setOutputUrl(null); }; const handleLoadedMetadata = (e: React.SyntheticEvent) => { setDuration(e.currentTarget.duration); setCurrentTime(0); }; const handleSeek = (time: number) => { setCurrentTime(time); if (videoRef.current) videoRef.current.currentTime = time; }; const parseArgs = (input: string) => { const args: string[] = []; let current = "", inQuotes = false, quoteChar = ""; for (let i = 0; i < input.length; i++) { const ch = input[i]; if ((ch === `"` || ch === `'`) && !inQuotes) { inQuotes = true; quoteChar = ch; } else if (ch === quoteChar && inQuotes) { inQuotes = false; quoteChar = ""; } else if (ch === " " && !inQuotes) { if (current.length) { args.push(current); current = ""; } } else { current += ch; } } if (current.length) args.push(current); return args; }; const handleInfer = async () => { const result = await tb.infer(); if (result) { setCommand(result.command); setExplanation(result.explanation); setOutputName(result.outputFilename || "output.mp4"); setOutputMime(result.outputMimeType || "video/mp4"); addLog(`✦ AI: ${result.explanation}`); } }; const handleRun = async () => { if (!inputFile || !loaded || !command.trim()) return; setProcessing(true); addLog("Processing..."); const ffmpeg = ffmpegRef.current; try { const inputExt = inputFile.name.split(".").pop() || "mp4"; const inputName = `input.${inputExt}`; await ffmpeg.writeFile(inputName, await fetchFile(inputFile)); const templated = command .replaceAll("{input}", inputName) .replaceAll("{output}", outputName) .replaceAll("{time}", currentTime.toFixed(2)); const args = parseArgs(templated); addLog(`Running: ffmpeg ${args.join(" ")}`); await ffmpeg.exec(args); const data = await ffmpeg.readFile(outputName); const blob = new Blob([data], { type: outputMime }); if (outputUrl) URL.revokeObjectURL(outputUrl); setOutputUrl(URL.createObjectURL(blob)); addLog("Done!"); } catch (err) { addLog(`Error: ${err}`); } setProcessing(false); }; const handleDownload = async () => { if (!outputUrl) return; if (navigator.share && navigator.canShare?.({ files: [new File([], "t.mp4", { type: outputMime })] })) { const resp = await fetch(outputUrl); const blob = await resp.blob(); await navigator.share({ files: [new File([blob], outputName, { type: outputMime })] }); } else { const a = document.createElement("a"); a.href = outputUrl; a.download = outputName; a.click(); } }; const renderOutputPreview = () => { if (!outputUrl) return null; if (outputMime.startsWith("image/")) return Output; if (outputMime.startsWith("audio/")) return