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from urllib.parse import urlparse, parse_qs
from datetime import datetime
import yt_dlp
from youtube_transcript_api import (
YouTubeTranscriptApi,
TranscriptsDisabled,
NoTranscriptFound
)
from loguru import logger
from core.state import AgenticState
@logger.catch
async def node_1_video_metadata_and_source_detection(state: AgenticState) -> AgenticState:
"""
Node 1: YouTube Metadata + Transcript Source Detection
"""
logger.info("🚀 Node 1: Video Metadata & Source Detection")
url = getattr(state, "youtube_url", None)
if not url:
state.errors.append({
"type": "invalid_input",
"message": "Missing YouTube URL"
})
return state
# Extract Video ID
video_id = None
try:
parsed = urlparse(url)
if "youtu.be" in parsed.netloc:
video_id = parsed.path.lstrip("/")
elif "youtube.com" in parsed.netloc:
video_id = parse_qs(parsed.query).get("v", [None])[0]
if not video_id or not re.match(r"^[a-zA-Z0-9_-]{11}$", video_id):
raise ValueError("Invalid YouTube video ID")
state.video_id = video_id
logger.info(" ✓ Video ID: {video_id}", video_id=video_id)
except Exception as e:
state.errors.append({
"type": "url_parse_failed",
"message": str(e)
})
logger.opt(exception=e, diagnose=False).error("Url parse failed")
return state
# Metadata Extraction (yt-dlp)
try:
ydl_opts = {
"quiet": True,
"skip_download": True,
"extract_flat": True
}
with yt_dlp.YoutubeDL(ydl_opts) as ydl:
info = ydl.extract_info(url, download=False)
state.title = info.get("title")
state.channel = info.get("channel")
state.duration_seconds = info.get("duration")
state.is_live = info.get("is_live", False)
upload = info.get("upload_date")
if upload:
state.upload_date = datetime.strptime(upload, "%Y%m%d").date().isoformat()
else:
state.upload_date = None
if state.duration_seconds:
mins, sec = divmod(state.duration_seconds, 60)
hrs, mins = divmod(mins, 60)
if hrs:
state.duration_human = f"{hrs}h {mins}m {sec}s"
else:
state.duration_human = f"{mins}m {sec}s"
logger.info(" ✓ Metadata extracted")
except Exception as e:
state.extraction_warnings.append(
f"Metadata extraction failed: {str(e)[:120]}"
)
logger.opt(exception=e, diagnose=False).error("Metadata extraction failed")
state.title = "Unknown"
state.channel = "Unknown"
state.duration_seconds = None
state.duration_human = None
state.upload_date = None
state.is_live = False
# Caption Detection
try:
api = YouTubeTranscriptApi()
transcript_list = api.list(video_id)
transcripts = list(transcript_list)
manual = [t for t in transcripts if not t.is_generated]
generated = [t for t in transcripts if t.is_generated]
if manual:
state.has_manual_captions = "yes"
state.language = manual[0].language_code
elif generated:
state.has_manual_captions = "auto-only"
state.language = generated[0].language_code
else:
state.has_manual_captions = "no"
state.language = "unknown"
logger.info(" ✓ Captions: {has_manual_captions} ({language})", has_manual_captions=state.has_manual_captions, language=state.language)
except TranscriptsDisabled:
state.has_manual_captions = "no"
state.language = "unknown"
state.extraction_warnings.append("Captions disabled")
except NoTranscriptFound:
state.has_manual_captions = "no"
state.language = "unknown"
state.extraction_warnings.append("No transcripts available")
except Exception as e:
state.has_manual_captions = "unknown"
state.language = "unknown"
state.extraction_warnings.append(
f"Caption check failed: {str(e)[:120]}"
)
logger.opt(exception=e, diagnose=False).error("Caption check failed")
# Decide Best Transcript Source
if state.is_live:
state.best_transcript_source = "none"
state.source_confidence = 0.0
state.extraction_warnings.append(
"Live streams usually have no transcripts"
)
elif state.has_manual_captions == "yes":
state.best_transcript_source = "youtube_manual"
state.source_confidence = 0.95
elif state.has_manual_captions == "auto-only":
state.best_transcript_source = "youtube_auto"
state.source_confidence = 0.80
else:
state.best_transcript_source = "whisper"
state.source_confidence = 0.60
state.extraction_warnings.append(
"No captions → Whisper fallback recommended"
)
# Control Flags
state.metadata_ready = True
state.next_extraction_strategy = state.best_transcript_source
# Logging
logger.info("✅ Node 1 Complete")
logger.info(" Title: {title}", title=state.title)
logger.info(" Channel: {channel}", channel=state.channel)
logger.info(" Duration: {duration_human}", duration_human=state.duration_human)
logger.info(" Captions: {has_manual_captions}", has_manual_captions=state.has_manual_captions)
logger.info(" Language: {language}", language=state.language)
logger.info(" Source: {best_transcript_source}", best_transcript_source=state.best_transcript_source)
logger.info(" Confidence: {source_confidence}", source_confidence=state.source_confidence)
if state.extraction_warnings:
logger.warning(" Warnings: {count} warnings", count=len(state.extraction_warnings))
for warning in state.extraction_warnings:
logger.warning(" - {warning}", warning=warning)
return state |