pipeline.py

import openai
from pytube import YouTube
import argparse
import os
from tqdm import tqdm
from SRT import SRT_script
import stable_whisper

parser = argparse.ArgumentParser()
parser.add_argument("--link", help="youtube video link here", default=None, type=str, required=False)
parser.add_argument("--video_file", help="local video path here", default=None, type=str, required=False)
parser.add_argument("--audio_file", help="local audio path here", default=None, type=str, required=False)
parser.add_argument("--srt_file", help="srt file input path here", default=None, type=str, required=False)  # New argument
parser.add_argument("--download", help="download path", default='./downloads', type=str, required=False)
parser.add_argument("--output_dir", help="translate result path", default='./results', type=str, required=False)
parser.add_argument("--video_name", help="video name, if use video link as input, the name will auto-filled by youtube video name", default='placeholder', type=str, required=False)
parser.add_argument("--model_name", help="model name only support text-davinci-003 and gpt-3.5-turbo", type=str, required=False, default="gpt-3.5-turbo")
parser.add_argument("-only_srt", help="set script output to only .srt file", action='store_true')
parser.add_argument("-v", help="auto encode script with video", action='store_true')
args = parser.parse_args()

# input should be either video file or youtube video link.
if args.link is None and args.video_file is None and args.srt_file is None:
    print("need video source or srt file")
    exit()

# set up
openai.api_key = os.getenv("OPENAI_API_KEY")
DOWNLOAD_PATH = args.download
if not os.path.exists(DOWNLOAD_PATH):
    os.mkdir(DOWNLOAD_PATH)
    os.mkdir(f'{DOWNLOAD_PATH}/audio')
    os.mkdir(f'{DOWNLOAD_PATH}/video')

RESULT_PATH = args.output_dir
if not os.path.exists(RESULT_PATH):
    os.mkdir(RESULT_PATH)

VIDEO_NAME = args.video_name
model_name = args.model_name

# get source audio
if args.link is not None and args.video_file is None:
    # Download audio from YouTube
    video_link = args.link
    video = None
    audio = None
    try:
        yt = YouTube(video_link)
        video = yt.streams.filter(progressive=True, file_extension='mp4').order_by('resolution').desc().first()
        if video:
            video.download(f'{DOWNLOAD_PATH}/video')
            print('Video download completed!')
        else:
            print("Error: Video stream not found")
        audio = yt.streams.filter(only_audio=True, file_extension='mp4').first()
        if audio:
            audio.download(f'{DOWNLOAD_PATH}/audio')
            print('Audio download completed!')
        else:
            print("Error: Audio stream not found")
    except Exception as e:
        print("Connection Error")
        print(e) 
        exit()
    
    video_path = f'{DOWNLOAD_PATH}/video/{video.default_filename}'
    audio_path = '{}/audio/{}'.format(DOWNLOAD_PATH, audio.default_filename)
    audio_file = open(audio_path, "rb")
    if VIDEO_NAME == 'placeholder':
        VIDEO_NAME = audio.default_filename.split('.')[0]
elif args.video_file is not None:
    # Read from local
    video_path = args.video_file
    if args.audio_file is not None:
        audio_file= open(args.audio_file, "rb")
        audio_path = args.audio_file
    else:
        os.system(f'ffmpeg -i {args.video_file} -f mp3 -ab 192000 -vn {DOWNLOAD_PATH}/audio/{VIDEO_NAME}.mp3')
        audio_file= open(f'{DOWNLOAD_PATH}/audio/{VIDEO_NAME}.mp3', "rb")
        audio_path = f'{DOWNLOAD_PATH}/audio/{VIDEO_NAME}.mp3'

if not os.path.exists(f'{RESULT_PATH}/{VIDEO_NAME}'):
    os.mkdir(f'{RESULT_PATH}/{VIDEO_NAME}')

# Instead of using the script_en variable directly, we'll use script_input
srt_file_en = args.srt_file 

if srt_file_en is not None: 
    srt = SRT_script.parse_from_srt_file(srt_file_en)
else:
    # using whisper to perform speech-to-text and save it in <video name>_en.txt under RESULT PATH.
    srt_file_en = "{}/{}/{}_en.srt".format(RESULT_PATH, VIDEO_NAME, VIDEO_NAME)
    if not os.path.exists(srt_file_en):

        # use OpenAI API for transcribe
        # transcript = openai.Audio.transcribe("whisper-1", audio_file) 

        # use local whisper model 
        # model = whisper.load_model("base") # using base model in local machine (may use large model on our server)
        # transcript = model.transcribe(audio_path)

        # use stable-whisper
        model = stable_whisper.load_model('base')
        transcript = model.transcribe(audio_path, regroup = False)
        (
            transcript
            .split_by_punctuation(['.', '。', '?'])
            .merge_by_gap(.15, max_words=3)
            .merge_by_punctuation([' '])
            .split_by_punctuation(['.', '。', '?'])
        )
        # transcript.to_srt_vtt(srt_file_en)
        transcript = transcript.to_dict()
        srt = SRT_script(transcript['segments']) # read segments to SRT class

        #Write SRT file
        
        # from whisper.utils import WriteSRT
        # with open(srt_file_en, 'w', encoding="utf-8") as f:
        #     writer = WriteSRT(RESULT_PATH)
        #     writer.write_result(transcript, f)
    else:
        srt = SRT_script.parse_from_srt_file(srt_file_en)

# srt preprocess
srt.form_whole_sentence()
srt.spell_check_term()
srt.correct_with_force_term()
srt.write_srt_file_src(srt_file_en)
script_input = srt.get_source_only()

if not args.only_srt:
    from srt2ass import srt2ass
    assSub_en = srt2ass(srt_file_en, "default", "No", "Modest")
    print('ASS subtitle saved as: ' + assSub_en)


# Split the video script by sentences and create chunks within the token limit
def script_split(script_in, chunk_size = 1000):
    script_split = script_in.split('\n\n')
    script_arr = []
    range_arr = []
    start = 1
    end = 0
    script = ""
    for sentence in script_split:
        if len(script) + len(sentence) + 1 <= chunk_size:
            script += sentence + '\n\n'
            end+=1
        else:
            range_arr.append((start, end))
            start = end+1
            end += 1
            script_arr.append(script.strip())
            script = sentence + '\n\n'
    if script.strip():
        script_arr.append(script.strip())
        range_arr.append((start, len(script_split)-1))

    assert len(script_arr) == len(range_arr)
    return script_arr, range_arr

script_arr, range_arr = script_split(script_input)

def get_response(model_name):
    if model_name == "gpt-3.5-turbo":
        # print(s + "\n")
        response = openai.ChatCompletion.create(
            model=model_name,
            messages = [
                {"role": "system", "content": "You are a helpful assistant that translates English to Chinese and have decent background in starcraft2."},
                {"role": "system", "content": "Your translation has to keep the orginal format and be as accurate as possible."},
                {"role": "system", "content": "There is no need for you to add any comments or notes."},
                {"role": "user", "content": 'Translate the following English text to Chinese: "{}"'.format(s)}
            ],
            temperature=0.15
        )

        return response['choices'][0]['message']['content'].strip()

    if model_name == "text-davinci-003":
        prompt = f"Please help me translate this into Chinese:\n\n{s}\n\n"
        # print(prompt)
        response = openai.Completion.create(
            model=model_name,
            prompt=prompt,
            temperature=0.1,
            max_tokens=2000,
            top_p=1.0,
            frequency_penalty=0.0,
            presence_penalty=0.0
        )
        return response['choices'][0]['text'].strip()
    pass
        
        
# Translate and save
for s, range in tqdm(zip(script_arr, range_arr)):
    # using chatgpt model
    print(f"now translating sentences {range}")
    flag = True
    while flag:
        flag = False
        try:
            translate = get_response(model_name)
        except Exception as e:
            print("An error has occurred during translation:",e)
            print("Retrying...")
            flag = True
    srt.set_translation(translate, range)

srt.check_len_and_split()
srt.write_srt_file_translate(f"{RESULT_PATH}/{VIDEO_NAME}/{VIDEO_NAME}_zh.srt")
srt.write_srt_file_bilingual(f"{RESULT_PATH}/{VIDEO_NAME}/{VIDEO_NAME}_bi.srt")

if not args.only_srt:
    assSub_zh = srt2ass(f"{RESULT_PATH}/{VIDEO_NAME}/{VIDEO_NAME}_zh.srt", "default", "No", "Modest")
    print('ASS subtitle saved as: ' + assSub_zh)

if args.v:
    if args.only_srt:
        os.system(f'ffmpeg -i {video_path} -vf "subtitles={RESULT_PATH}/{VIDEO_NAME}/{VIDEO_NAME}_zh.srt" {RESULT_PATH}/{VIDEO_NAME}/{VIDEO_NAME}.mp4')
    else:
        os.system(f'ffmpeg -i {video_path} -vf "subtitles={RESULT_PATH}/{VIDEO_NAME}/{VIDEO_NAME}_zh.ass" {RESULT_PATH}/{VIDEO_NAME}/{VIDEO_NAME}.mp4')