import json from functools import lru_cache import youtube_transcript_api2 import json import re import requests from transformers import ( AutoModelForSequenceClassification, AutoTokenizer, TextClassificationPipeline, ) from typing import Any, Dict, List import os import numpy as np CATEGORIES = [None, 'SPONSOR', 'SELFPROMO', 'INTERACTION'] PROFANITY_RAW = '[ __ ]' # How YouTube transcribes profanity PROFANITY_CONVERTED = '*****' # Safer version for tokenizing NUM_DECIMALS = 3 # https://www.fincher.org/Utilities/CountryLanguageList.shtml # https://lingohub.com/developers/supported-locales/language-designators-with-regions LANGUAGE_PREFERENCE_LIST = ['en-GB', 'en-US', 'en-CA', 'en-AU', 'en-NZ', 'en-ZA', 'en-IE', 'en-IN', 'en-JM', 'en-BZ', 'en-TT', 'en-PH', 'en-ZW', 'en'] def parse_transcript_json(json_data, granularity): assert json_data['wireMagic'] == 'pb3' assert granularity in ('word', 'chunk') # TODO remove bracketed words? # (kiss smacks) # (upbeat music) # [text goes here] # Some manual transcripts aren't that well formatted... but do have punctuation # https://www.youtube.com/watch?v=LR9FtWVjk2c parsed_transcript = [] events = json_data['events'] for event_index, event in enumerate(events): segments = event.get('segs') if not segments: continue # This value is known (when phrase appears on screen) start_ms = event['tStartMs'] total_characters = 0 new_segments = [] for seg in segments: # Replace \n, \t, etc. with space text = ' '.join(seg['utf8'].split()) # Remove zero-width spaces and strip trailing and leading whitespace text = text.replace('\u200b', '').replace('\u200c', '').replace( '\u200d', '').replace('\ufeff', '').strip() # Alternatively, # text = text.encode('ascii', 'ignore').decode() # Needed for auto-generated transcripts text = text.replace(PROFANITY_RAW, PROFANITY_CONVERTED) if not text: continue offset_ms = seg.get('tOffsetMs', 0) new_segments.append({ 'text': text, 'start': round((start_ms + offset_ms)/1000, NUM_DECIMALS) }) total_characters += len(text) if not new_segments: continue if event_index < len(events) - 1: next_start_ms = events[event_index + 1]['tStartMs'] total_event_duration_ms = min( event.get('dDurationMs', float('inf')), next_start_ms - start_ms) else: total_event_duration_ms = event.get('dDurationMs', 0) # Ensure duration is non-negative total_event_duration_ms = max(total_event_duration_ms, 0) avg_seconds_per_character = ( total_event_duration_ms/total_characters)/1000 num_char_count = 0 for seg_index, seg in enumerate(new_segments): num_char_count += len(seg['text']) # Estimate segment end seg_end = seg['start'] + \ (num_char_count * avg_seconds_per_character) if seg_index < len(new_segments) - 1: # Do not allow longer than next seg_end = min(seg_end, new_segments[seg_index+1]['start']) seg['end'] = round(seg_end, NUM_DECIMALS) parsed_transcript.append(seg) final_parsed_transcript = [] for i in range(len(parsed_transcript)): word_level = granularity == 'word' if word_level: split_text = parsed_transcript[i]['text'].split() elif granularity == 'chunk': # Split on space after punctuation split_text = re.split( r'(?<=[.!?,-;])\s+', parsed_transcript[i]['text']) if len(split_text) == 1: split_on_whitespace = parsed_transcript[i]['text'].split() if len(split_on_whitespace) >= 8: # Too many words # Rather split on whitespace instead of punctuation split_text = split_on_whitespace else: word_level = True else: raise ValueError('Unknown granularity') segment_end = parsed_transcript[i]['end'] if i < len(parsed_transcript) - 1: segment_end = min(segment_end, parsed_transcript[i+1]['start']) segment_duration = segment_end - parsed_transcript[i]['start'] num_chars_in_text = sum(map(len, split_text)) num_char_count = 0 current_offset = 0 for s in split_text: num_char_count += len(s) next_offset = (num_char_count/num_chars_in_text) * segment_duration word_start = round( parsed_transcript[i]['start'] + current_offset, NUM_DECIMALS) word_end = round( parsed_transcript[i]['start'] + next_offset, NUM_DECIMALS) # Make the reasonable assumption that min wps is 1.5 final_parsed_transcript.append({ 'text': s, 'start': word_start, 'end': min(word_end, word_start + 1.5) if word_level else word_end }) current_offset = next_offset return final_parsed_transcript def list_transcripts(video_id): try: return youtube_transcript_api2.YouTubeTranscriptApi.list_transcripts(video_id) except json.decoder.JSONDecodeError: return None WORDS_TO_REMOVE = [ '[Music]' '[Applause]' '[Laughter]' ] @lru_cache(maxsize=16) def get_words(video_id, transcript_type='auto', fallback='manual', filter_words_to_remove=True, granularity='word'): """Get parsed video transcript with caching system returns None if not processed yet and process is False """ raw_transcript_json = None try: transcript_list = list_transcripts(video_id) if transcript_list is not None: if transcript_type == 'manual': ts = transcript_list.find_manually_created_transcript( LANGUAGE_PREFERENCE_LIST) else: ts = transcript_list.find_generated_transcript( LANGUAGE_PREFERENCE_LIST) raw_transcript = ts._http_client.get( f'{ts._url}&fmt=json3').content if raw_transcript: raw_transcript_json = json.loads(raw_transcript) except (youtube_transcript_api2.TooManyRequests, youtube_transcript_api2.YouTubeRequestFailed): raise # Cannot recover from these errors and do not mark as empty transcript except requests.exceptions.RequestException: # Can recover return get_words(video_id, transcript_type, fallback, granularity) except youtube_transcript_api2.CouldNotRetrieveTranscript: # Retrying won't solve pass # Mark as empty transcript except json.decoder.JSONDecodeError: return get_words(video_id, transcript_type, fallback, granularity) if not raw_transcript_json and fallback is not None: return get_words(video_id, transcript_type=fallback, fallback=None, granularity=granularity) if raw_transcript_json: processed_transcript = parse_transcript_json( raw_transcript_json, granularity) if filter_words_to_remove: processed_transcript = list( filter(lambda x: x['text'] not in WORDS_TO_REMOVE, processed_transcript)) else: processed_transcript = raw_transcript_json # Either None or [] return processed_transcript def word_start(word): return word['start'] def word_end(word): return word.get('end', word['start']) def extract_segment(words, start, end, map_function=None): """Extracts all words with time in [start, end]""" a = max(binary_search_below(words, 0, len(words), start), 0) b = min(binary_search_above(words, -1, len(words) - 1, end) + 1, len(words)) to_transform = map_function is not None and callable(map_function) return [ map_function(words[i]) if to_transform else words[i] for i in range(a, b) ] def avg(*items): return sum(items)/len(items) def binary_search_below(transcript, start_index, end_index, time): if start_index >= end_index: return end_index middle_index = (start_index + end_index) // 2 middle = transcript[middle_index] middle_time = avg(word_start(middle), word_end(middle)) if time <= middle_time: return binary_search_below(transcript, start_index, middle_index, time) else: return binary_search_below(transcript, middle_index + 1, end_index, time) def binary_search_above(transcript, start_index, end_index, time): if start_index >= end_index: return end_index middle_index = (start_index + end_index + 1) // 2 middle = transcript[middle_index] middle_time = avg(word_start(middle), word_end(middle)) if time >= middle_time: return binary_search_above(transcript, middle_index, end_index, time) else: return binary_search_above(transcript, start_index, middle_index - 1, time) class PreTrainedPipeline(): def __init__(self, path: str): self.model2 = AutoModelForSequenceClassification.from_pretrained(path) self.tokenizer2 = AutoTokenizer.from_pretrained(path) self.pipeline2 = SponsorBlockClassificationPipeline( model=self.model2, tokenizer=self.tokenizer2) def __call__(self, inputs: str)-> List[Dict[str, Any]]: if ' ' not in inputs and inputs.count(',') >= 2: # Automated call (compressed string) split_info = inputs.split(',', 1) times = np.reshape(np.array(split_info[1].split(',')), (-1, 2)) data = [] for start, end in times: data.append({ 'video_id': split_info[0], 'start': float(start), 'end': float(end) }) else: data = inputs return self.pipeline2(data) class SponsorBlockClassificationPipeline(TextClassificationPipeline): def __init__(self, model, tokenizer): super().__init__(model=model, tokenizer=tokenizer, return_all_scores=True) def preprocess(self, data, **tokenizer_kwargs): if isinstance(data, str): # If string, assume this is what user wants to classify text = data else: # Otherwise, get data from transcript words = get_words(data['video_id']) segment_words = extract_segment(words, data['start'], data['end']) text = ' '.join(x['text'] for x in segment_words) return self.tokenizer( text, return_tensors=self.framework, **tokenizer_kwargs)