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import { FFmpeg } from '@ffmpeg/ffmpeg';
import { toBlobURL } from '@ffmpeg/util';
let ffmpeg: FFmpeg | null = null;
export const initFFmpeg = async (): Promise<FFmpeg> => {
if (ffmpeg) return ffmpeg;
ffmpeg = new FFmpeg();
// Use locally hosted files instead of CDN
const baseURL = '/ffmpeg';
await ffmpeg.load({
coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),
wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),
});
return ffmpeg;
};
export const generateThumbnail = async (
videoFile: File,
timeInSeconds: number = 1
): Promise<string> => {
const ffmpeg = await initFFmpeg();
const inputName = 'input.mp4';
const outputName = 'thumbnail.jpg';
// Write input file
await ffmpeg.writeFile(inputName, new Uint8Array(await videoFile.arrayBuffer()));
// Generate thumbnail at specific time
await ffmpeg.exec([
'-i', inputName,
'-ss', timeInSeconds.toString(),
'-vframes', '1',
'-vf', 'scale=320:240',
'-q:v', '2',
outputName
]);
// Read output file
const data = await ffmpeg.readFile(outputName);
const blob = new Blob([data], { type: 'image/jpeg' });
// Cleanup
await ffmpeg.deleteFile(inputName);
await ffmpeg.deleteFile(outputName);
return URL.createObjectURL(blob);
};
export const trimVideo = async (
videoFile: File,
startTime: number,
endTime: number,
onProgress?: (progress: number) => void
): Promise<Blob> => {
const ffmpeg = await initFFmpeg();
const inputName = 'input.mp4';
const outputName = 'output.mp4';
// Set up progress callback
if (onProgress) {
ffmpeg.on('progress', ({ progress }) => {
onProgress(progress * 100);
});
}
// Write input file
await ffmpeg.writeFile(inputName, new Uint8Array(await videoFile.arrayBuffer()));
const duration = endTime - startTime;
// Trim video
await ffmpeg.exec([
'-i', inputName,
'-ss', startTime.toString(),
'-t', duration.toString(),
'-c', 'copy', // Use stream copy for faster processing
outputName
]);
// Read output file
const data = await ffmpeg.readFile(outputName);
const blob = new Blob([data], { type: 'video/mp4' });
// Cleanup
await ffmpeg.deleteFile(inputName);
await ffmpeg.deleteFile(outputName);
return blob;
};
export const getVideoInfo = async (videoFile: File): Promise<{
duration: number;
width: number;
height: number;
fps: number;
}> => {
const ffmpeg = await initFFmpeg();
const inputName = 'input.mp4';
// Write input file
await ffmpeg.writeFile(inputName, new Uint8Array(await videoFile.arrayBuffer()));
// Capture FFmpeg stderr output with a one-time listener pattern
let ffmpegOutput = '';
let listening = true;
const listener = (data: string) => {
if (listening) ffmpegOutput += data;
};
ffmpeg.on('log', ({ message }) => listener(message));
// Run ffmpeg to get info (stderr will contain the info)
try {
await ffmpeg.exec(['-i', inputName, '-f', 'null', '-']);
} catch (error) {
listening = false;
await ffmpeg.deleteFile(inputName);
console.error('FFmpeg execution failed:', error);
throw new Error('Failed to extract video info. The file may be corrupted or in an unsupported format.');
}
// Disable listener after exec completes
listening = false;
// Cleanup
await ffmpeg.deleteFile(inputName);
// Parse output for duration, resolution, and fps
// Example: Duration: 00:00:10.00, start: 0.000000, bitrate: 1234 kb/s
// Example: Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 90k tbn, 60 tbc
const durationMatch = ffmpegOutput.match(/Duration: (\d+):(\d+):([\d.]+)/);
let duration = 0;
if (durationMatch) {
const [, h, m, s] = durationMatch;
duration = parseInt(h) * 3600 + parseInt(m) * 60 + parseFloat(s);
}
const videoStreamMatch = ffmpegOutput.match(/Video:.* (\d+)x(\d+)[^,]*, ([\d.]+) fps/);
let width = 0, height = 0, fps = 0;
if (videoStreamMatch) {
width = parseInt(videoStreamMatch[1]);
height = parseInt(videoStreamMatch[2]);
fps = parseFloat(videoStreamMatch[3]);
}
return {
duration,
width,
height,
fps
};
};
export const convertToWebM = async (
videoFile: File,
onProgress?: (progress: number) => void
): Promise<Blob> => {
const ffmpeg = await initFFmpeg();
const inputName = 'input.mp4';
const outputName = 'output.webm';
// Set up progress callback
if (onProgress) {
ffmpeg.on('progress', ({ progress }) => {
onProgress(progress * 100);
});
}
// Write input file
await ffmpeg.writeFile(inputName, new Uint8Array(await videoFile.arrayBuffer()));
// Convert to WebM
await ffmpeg.exec([
'-i', inputName,
'-c:v', 'libvpx-vp9',
'-crf', '30',
'-b:v', '0',
'-c:a', 'libopus',
outputName
]);
// Read output file
const data = await ffmpeg.readFile(outputName);
const blob = new Blob([data], { type: 'video/webm' });
// Cleanup
await ffmpeg.deleteFile(inputName);
await ffmpeg.deleteFile(outputName);
return blob;
};
export const extractAudio = async (
videoFile: File,
format: 'mp3' | 'wav' = 'mp3'
): Promise<Blob> => {
const ffmpeg = await initFFmpeg();
const inputName = 'input.mp4';
const outputName = `output.${format}`;
// Write input file
await ffmpeg.writeFile(inputName, new Uint8Array(await videoFile.arrayBuffer()));
// Extract audio
await ffmpeg.exec([
'-i', inputName,
'-vn', // Disable video
'-acodec', format === 'mp3' ? 'libmp3lame' : 'pcm_s16le',
outputName
]);
// Read output file
const data = await ffmpeg.readFile(outputName);
const blob = new Blob([data], { type: `audio/${format}` });
// Cleanup
await ffmpeg.deleteFile(inputName);
await ffmpeg.deleteFile(outputName);
return blob;
};
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