Matt Van Horn
364 lines
11 KiB
Python
364 lines
11 KiB
Python
"""YouTube search and transcript extraction via yt-dlp for /last30days v2.1.
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Uses yt-dlp (https://github.com/yt-dlp/yt-dlp) for both YouTube search and
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transcript extraction. No API keys needed — just have yt-dlp installed.
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Inspired by Peter Steinberger's toolchain approach (yt-dlp + summarize CLI).
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"""
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import json
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import math
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import os
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import re
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import signal
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import shutil
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import subprocess
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import sys
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import tempfile
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from concurrent.futures import ThreadPoolExecutor, as_completed
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from pathlib import Path
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from typing import Any, Dict, List, Optional, Set, Tuple
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# Depth configurations: how many videos to search / transcribe
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DEPTH_CONFIG = {
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"quick": 10,
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"default": 20,
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"deep": 40,
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}
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TRANSCRIPT_LIMITS = {
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"quick": 3,
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"default": 5,
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"deep": 8,
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}
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# Max words to keep from each transcript
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TRANSCRIPT_MAX_WORDS = 500
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from .relevance import token_overlap_relevance as _compute_relevance
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def _log(msg: str):
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"""Log to stderr."""
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sys.stderr.write(f"[YouTube] {msg}\n")
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sys.stderr.flush()
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def is_ytdlp_installed() -> bool:
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"""Check if yt-dlp is available in PATH."""
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return shutil.which("yt-dlp") is not None
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def _extract_core_subject(topic: str) -> str:
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"""Extract core subject from verbose query for YouTube search.
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NOTE: 'tips', 'tricks', 'tutorial', 'guide', 'review', 'reviews'
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are intentionally KEPT — they're YouTube content types that improve search.
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"""
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from .query import extract_core_subject
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# YouTube-specific noise set: smaller than default, keeps content-type words
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_YT_NOISE = frozenset({
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'best', 'top', 'good', 'great', 'awesome', 'killer',
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'latest', 'new', 'news', 'update', 'updates',
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'trending', 'hottest', 'popular', 'viral',
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'practices', 'features',
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'recommendations', 'advice',
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'prompt', 'prompts', 'prompting',
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'methods', 'strategies', 'approaches',
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})
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return extract_core_subject(topic, noise=_YT_NOISE)
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def search_youtube(
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topic: str,
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from_date: str,
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to_date: str,
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depth: str = "default",
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) -> Dict[str, Any]:
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"""Search YouTube via yt-dlp. No API key needed.
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Args:
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topic: Search topic
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from_date: Start date (YYYY-MM-DD)
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to_date: End date (YYYY-MM-DD)
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depth: 'quick', 'default', or 'deep'
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Returns:
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Dict with 'items' list of video metadata dicts.
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"""
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if not is_ytdlp_installed():
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return {"items": [], "error": "yt-dlp not installed"}
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count = DEPTH_CONFIG.get(depth, DEPTH_CONFIG["default"])
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core_topic = _extract_core_subject(topic)
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_log(f"Searching YouTube for '{core_topic}' (since {from_date}, count={count})")
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# yt-dlp search with full metadata (no --flat-playlist so dates are real).
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# NOTE: --dateafter intentionally omitted — YouTube search returns
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# relevance-sorted results and strict date filtering returns 0 for
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# evergreen topics. Python soft filter (below) handles date filtering.
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cmd = [
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"yt-dlp",
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"--ignore-config",
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"--no-cookies-from-browser",
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f"ytsearch{count}:{core_topic}",
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"--dump-json",
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"--no-warnings",
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"--no-download",
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]
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preexec = os.setsid if hasattr(os, 'setsid') else None
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try:
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proc = subprocess.Popen(
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cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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text=True,
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preexec_fn=preexec,
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)
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try:
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stdout, stderr = proc.communicate(timeout=120)
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except subprocess.TimeoutExpired:
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try:
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os.killpg(os.getpgid(proc.pid), signal.SIGTERM)
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except (ProcessLookupError, PermissionError, OSError):
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proc.kill()
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proc.wait(timeout=5)
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_log("YouTube search timed out (120s)")
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return {"items": [], "error": "Search timed out"}
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except FileNotFoundError:
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return {"items": [], "error": "yt-dlp not found"}
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if not (stdout or "").strip():
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_log("YouTube search returned 0 results")
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return {"items": []}
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# Parse JSON-per-line output
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items = []
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for line in stdout.strip().split("\n"):
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line = line.strip()
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if not line:
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continue
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try:
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video = json.loads(line)
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except json.JSONDecodeError:
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continue
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video_id = video.get("id", "")
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view_count = video.get("view_count") or 0
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like_count = video.get("like_count") or 0
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comment_count = video.get("comment_count") or 0
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upload_date = video.get("upload_date", "") # YYYYMMDD
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# Convert YYYYMMDD to YYYY-MM-DD
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date_str = None
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if upload_date and len(upload_date) == 8:
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date_str = f"{upload_date[:4]}-{upload_date[4:6]}-{upload_date[6:8]}"
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items.append({
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"video_id": video_id,
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"title": video.get("title", ""),
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"url": f"https://www.youtube.com/watch?v={video_id}",
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"channel_name": video.get("channel", video.get("uploader", "")),
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"date": date_str,
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"engagement": {
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"views": view_count,
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"likes": like_count,
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"comments": comment_count,
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},
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"duration": video.get("duration"),
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"relevance": _compute_relevance(core_topic, video.get("title", "")),
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"why_relevant": f"YouTube: {video.get('title', core_topic)[:60]}",
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})
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# Soft date filter: prefer recent items but fall back to all if too few
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recent = [i for i in items if i["date"] and i["date"] >= from_date]
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if len(recent) >= 3:
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items = recent
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_log(f"Found {len(items)} videos within date range")
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else:
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_log(f"Found {len(items)} videos ({len(recent)} within date range, keeping all)")
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# Sort by views descending
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items.sort(key=lambda x: x["engagement"]["views"], reverse=True)
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return {"items": items}
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def _clean_vtt(vtt_text: str) -> str:
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"""Convert VTT subtitle format to clean plaintext."""
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# Strip VTT header
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text = re.sub(r'^WEBVTT.*?\n\n', '', vtt_text, flags=re.DOTALL)
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# Strip timestamps
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text = re.sub(r'\d{2}:\d{2}:\d{2}\.\d{3}\s*-->\s*\d{2}:\d{2}:\d{2}\.\d{3}.*\n', '', text)
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# Strip position/alignment tags
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text = re.sub(r'<[^>]+>', '', text)
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# Strip cue numbers
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text = re.sub(r'^\d+\s*$', '', text, flags=re.MULTILINE)
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# Deduplicate overlapping lines
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lines = text.strip().split('\n')
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seen = set()
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unique = []
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for line in lines:
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stripped = line.strip()
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if stripped and stripped not in seen:
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seen.add(stripped)
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unique.append(stripped)
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return re.sub(r'\s+', ' ', ' '.join(unique)).strip()
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def fetch_transcript(video_id: str, temp_dir: str) -> Optional[str]:
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"""Fetch auto-generated transcript for a YouTube video.
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Args:
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video_id: YouTube video ID
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temp_dir: Temporary directory for subtitle files
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Returns:
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Plaintext transcript string, or None if no captions available.
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"""
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cmd = [
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"yt-dlp",
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"--ignore-config",
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"--no-cookies-from-browser",
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"--write-auto-subs",
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"--sub-lang", "en",
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"--sub-format", "vtt",
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"--skip-download",
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"--no-warnings",
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"-o", f"{temp_dir}/%(id)s",
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f"https://www.youtube.com/watch?v={video_id}",
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]
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preexec = os.setsid if hasattr(os, 'setsid') else None
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try:
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proc = subprocess.Popen(
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cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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text=True,
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preexec_fn=preexec,
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)
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try:
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proc.communicate(timeout=30)
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except subprocess.TimeoutExpired:
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try:
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os.killpg(os.getpgid(proc.pid), signal.SIGTERM)
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except (ProcessLookupError, PermissionError, OSError):
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proc.kill()
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proc.wait(timeout=5)
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return None
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except FileNotFoundError:
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return None
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# yt-dlp may save as .en.vtt or .en-orig.vtt
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vtt_path = Path(temp_dir) / f"{video_id}.en.vtt"
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if not vtt_path.exists():
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# Try alternate naming
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for p in Path(temp_dir).glob(f"{video_id}*.vtt"):
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vtt_path = p
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break
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else:
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return None
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try:
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raw = vtt_path.read_text(encoding="utf-8", errors="replace")
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except OSError:
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return None
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transcript = _clean_vtt(raw)
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# Truncate to max words
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words = transcript.split()
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if len(words) > TRANSCRIPT_MAX_WORDS:
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transcript = ' '.join(words[:TRANSCRIPT_MAX_WORDS]) + '...'
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return transcript if transcript else None
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def fetch_transcripts_parallel(
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video_ids: List[str],
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max_workers: int = 5,
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) -> Dict[str, Optional[str]]:
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"""Fetch transcripts for multiple videos in parallel.
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Args:
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video_ids: List of YouTube video IDs
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max_workers: Max parallel fetches
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Returns:
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Dict mapping video_id to transcript text (or None).
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"""
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if not video_ids:
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return {}
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_log(f"Fetching transcripts for {len(video_ids)} videos")
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results = {}
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with tempfile.TemporaryDirectory() as temp_dir:
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with ThreadPoolExecutor(max_workers=max_workers) as executor:
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futures = {
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executor.submit(fetch_transcript, vid, temp_dir): vid
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for vid in video_ids
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}
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for future in as_completed(futures):
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vid = futures[future]
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try:
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results[vid] = future.result()
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except Exception:
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results[vid] = None
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got = sum(1 for v in results.values() if v)
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_log(f"Got transcripts for {got}/{len(video_ids)} videos")
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return results
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def search_and_transcribe(
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topic: str,
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from_date: str,
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to_date: str,
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depth: str = "default",
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) -> Dict[str, Any]:
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"""Full YouTube search: find videos, then fetch transcripts for top results.
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Args:
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topic: Search topic
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from_date: Start date (YYYY-MM-DD)
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to_date: End date (YYYY-MM-DD)
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depth: 'quick', 'default', or 'deep'
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Returns:
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Dict with 'items' list. Each item has a 'transcript_snippet' field.
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"""
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# Step 1: Search
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search_result = search_youtube(topic, from_date, to_date, depth)
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items = search_result.get("items", [])
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if not items:
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return search_result
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# Step 2: Fetch transcripts for top N by views
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transcript_limit = TRANSCRIPT_LIMITS.get(depth, TRANSCRIPT_LIMITS["default"])
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top_ids = [item["video_id"] for item in items[:transcript_limit]]
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transcripts = fetch_transcripts_parallel(top_ids)
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# Step 3: Attach transcripts to items
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for item in items:
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vid = item["video_id"]
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transcript = transcripts.get(vid)
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item["transcript_snippet"] = transcript or ""
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return {"items": items}
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def parse_youtube_response(response: Dict[str, Any]) -> List[Dict[str, Any]]:
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"""Parse YouTube search response to normalized format.
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Returns:
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List of item dicts ready for normalization.
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"""
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return response.get("items", [])
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