YT即時翻譯字幕

程式語言：Python

套件：yt-dlp 、Deep Translator 

功能：這個功能主要的目的是當YT上有國外重要人士在YT上有直播訊而且有英文字幕時，在公司內希望除將YT直播畫面轉到電視頻道上播出，並請將原來的英文字幕將成中文，並且讓公司內部的字幕機去讀取轉換後的TXT檔案，顯示在電視頻道上某一特定區塊。

import yt_dlp

import requests

import time

from deep_translator import GoogleTranslator

def get_live_captions(youtube_url, lang="en"):

    """

    透過 yt-dlp 擷取 YouTube 直播字幕的 URL

    """

    ydl_opts = {

        "writesubtitles": True,

        "subtitleslangs": [lang],

        "skip_download": True,

        "quiet": True

    }

    with yt_dlp.YoutubeDL(ydl_opts) as ydl:

        info_dict = ydl.extract_info(youtube_url, download=False)

        subtitles = info_dict.get("subtitles", {}).get(lang, [])

        if subtitles:

            return subtitles[0]["url"]

    return None

def fetch_subtitle_and_translate(subtitle_url, output_file):

    """

    持續抓取 YouTube 直播字幕，翻譯成中文，並寫入 TXT 檔案

    """

    previous_lines = set()

    translator = GoogleTranslator(source="auto", target="zh-TW")

    while True:

        try:

            response = requests.get(subtitle_url)

            if response.status_code == 200 and response.text.strip():

                text = response.text.split("\n")

                new_lines = [line for line in text if line not in previous_lines and line.strip()]

                for line in new_lines:

                    translated = translator.translate(line)

                    if translated is None:

                        translated = "[無法翻譯]"

                    with open(output_file, "a", encoding="utf-8") as f:

                        f.write(translated + "\n")

                    previous_lines.add(line)

                    print(f"翻譯完成: {translated}")

            else:

                print("⚠️ 無法擷取字幕或字幕為空，請確認直播有開啟字幕功能")

            time.sleep(5)  # 每 5 秒抓取一次字幕

        except Exception as e:

            print(f"❌ 發生錯誤: {e}")

            time.sleep(10)  # 若發生錯誤，稍後再試

if __name__ == "__main__":

    youtube_live_url = "https://www.youtube.com/watch?v=你的直播ID"  # 替換成你的 YouTube 直播網址

    subtitle_url = get_live_captions(youtube_live_url, "en")  # 取得英文字幕網址

    if subtitle_url:

        print(f"📌 字幕網址: {subtitle_url}")

        fetch_subtitle_and_translate(subtitle_url, "translated_subtitles.txt")  # 下載並翻譯字幕

    else:

        print("❌ 無法擷取字幕！請確認直播是否開啟字幕功能。")