/**
* Utility functions for YouTube subtitle extraction
*/
/**
* Extract video ID from YouTube URL
*/
export function extractVideoId(url: string): string {
const patterns = [
/(?:youtube\.com\/watch\?v=|youtu\.be\/|youtube\.com\/embed\/)([^&\n?#]+)/,
/^([a-zA-Z0-9_-]{11})$/,
];
for (const pattern of patterns) {
const match = url.match(pattern);
if (match) {
return match[1];
}
}
throw new Error("Unable to extract video ID from URL");
}
/**
* Format timestamp (milliseconds) to SRT format
*/
export function formatSRTTime(ms: number): string {
const hours = Math.floor(ms / 3600000);
const minutes = Math.floor((ms % 3600000) / 60000);
const seconds = Math.floor((ms % 60000) / 1000);
const milliseconds = ms % 1000;
return `${String(hours).padStart(2, "0")}:${String(minutes).padStart(2, "0")}:${String(seconds).padStart(2, "0")},${String(milliseconds).padStart(3, "0")}`;
}
/**
* Format timestamp (milliseconds) to VTT format
*/
export function formatVTTTime(ms: number): string {
const hours = Math.floor(ms / 3600000);
const minutes = Math.floor((ms % 3600000) / 60000);
const seconds = Math.floor((ms % 60000) / 1000);
const milliseconds = ms % 1000;
return `${String(hours).padStart(2, "0")}:${String(minutes).padStart(2, "0")}:${String(seconds).padStart(2, "0")}.${String(milliseconds).padStart(3, "0")}`;
}
