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+# Tdarr Autoscaler
+
+Dynamic Tdarr worker scaling based on Plex activity. 
+
+Automatically scales Tdarr workers down when users are streaming on Plex
+and scales them back up when Plex becomes idle.\
+Designed to prevent CPU/GPU contention between Plex transcoding and
+Tdarr processing --- especially useful on Intel QSV, NVENC, or
+limited-resource servers.
+
+Inspired by https://github.com/triw0lf/tdarr-autoscale
+
+------------------------------------------------------------------------
+
+## Overview
+
+`tdarr-autoscaler.py` monitors Plex activity via Tautulli and dynamically
+adjusts Tdarr worker limits using the Tdarr API.
+
+It can:
+
+-   Detect active playback sessions
+-   Optionally count only active transcodes (ignores Direct Play /
+    Direct Stream)
+-   Apply different worker limits for:
+    -   Idle (day)
+    -   Active streaming (day)
+    -   Idle (night)
+    -   Active streaming (night)
+
+------------------------------------------------------------------------
+
+## Requirements
+
+-   Python 3.8+
+-   `requests` library
+
+Install dependency:
+
+``` bash
+pip install requests
+```
+
+------------------------------------------------------------------------
+
+## Configuration
+
+Edit the `CONFIGURATION` section inside `tdarr-autoscaler.py`:
+
+``` python
+#######################
+# CONFIGURATION
+#######################
+
+# Tdarr settings
+TDARR_URL = "http://tdarr-ip:port"
+
+# Worker type - what does your Tdarr use for transcoding?
+# Options: "GPU" (Intel QSV, NVENC, etc.), "CPU" (software encoding), or "BOTH"
+WORKER_TYPE = "GPU"
+
+# Tautulli settings
+TAUTULLI_URL = "http://tautulli-ip:port"
+TAUTULLI_API_KEY = ""  # Settings > Web Interface > API Key
+
+# Do not count Direct Play / Direct Stream since they are very easy on CPU/GPU
+COUNT_TRANSCODES_ONLY = True
+
+# Worker limits - adjust to your hardware capability
+WORKERS_IDLE = 1          # No one watching (daytime)
+WORKERS_ACTIVE = 0        # Someone is streaming
+WORKERS_NIGHT = 1         # No one watching (night)
+WORKERS_NIGHT_ACTIVE = 0  # Streaming during night
+
+# Night mode hours (24h format)
+NIGHT_START = 0   # Midnight
+NIGHT_END = 5     # 5 AM
+```
+
+Adjust worker values according to your hardware capacity and desired
+behavior.
+
+------------------------------------------------------------------------
+
+## Usage
+
+### Option 1 --- Run as Tautulli Notification Script (Recommended)
+
+1.  Copy `tdarr-autoscaler.py` into your **Tautulli scripts folder**
+
+2.  Edit the configuration section
+
+3.  In Tautulli, go to:
+
+    Settings → Notification Agents
+
+4.  Add a new **Script** notification agent
+
+5.  Select `tdarr-autoscaler.py`
+
+6.  Enable the following triggers:
+
+    -   Playback Start
+    -   Playback Stop
+    -   Playback Pause
+    -   Playback Resume
+    -   Transcode Decision Change
+
+7.  Leave **Conditions** and **Arguments** empty
+
+------------------------------------------------------------------------
+
+### Option 2 --- Run Manually
+
+``` bash
+chmod +x tdarr-autoscaler.py
+./tdarr-autoscaler.py
+```
+
+------------------------------------------------------------------------
+
+### Option 3 --- Run via Cron
+
+Example (runs every 5 minutes):
+
+``` bash
+*/5 * * * * /path/to/tdarr-autoscaler.py >> /path/to/tdarr-autoscaler.log 2>&1
+```
+
+------------------------------------------------------------------------
+
+## How It Works
+
+1.  Queries Tautulli API for current activity
+2.  Counts all sessions or only transcoding sessions (if enabled)
+3.  Detects whether current time is within configured night window
+4.  Sets Tdarr worker limits via Tdarr API
+5.  Logs actions with timestamps
+
+------------------------------------------------------------------------
+
+## Recommended Use Cases
+
+-   Single-GPU home servers
+-   Intel iGPU (QSV) systems
+-   Low-power NAS setups
+-   Systems where Plex transcoding must always take priority
+-   Mixed Tdarr + Plex workloads on shared hardware
+
+------------------------------------------------------------------------
+
+## License
+
+MIT
+
diff --git a/tdarr-autoscaler.py b/tdarr-autoscaler.py
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+#!/usr/bin/env python3
+"""
+Tdarr Autoscaler - Dynamic worker scaling based on Plex activity
+
+Automatically scales Tdarr workers down when people are streaming and back up when Plex is idle. 
+
+Requirements:
+  - Python 3.8+
+  - requests
+
+Run as Tautulli notification script:
+  - Copy tdarr-autoscaler.py into Tautulli scripts folder
+  - Edit the CONFIGURATION section below to match your infrastructure settings
+  - Add a new Script notification agent in Tautulli -> Settings -> Notification Agents and select tdarr-autoscaler.py from the scripts folder
+  - Configure the triggers for the notification script: Playback Start, Playback Stop, Playback Pause, Playback Resume and Transcode Decision Change
+  - Leave empty the Conditions and Arguments config
+
+OR
+
+Run manually (or cronjob):
+  chmod +x tdarr-autoscaler.py
+  ./tdarr-autoscaler.py
+
+  - Cron example:
+  */5 * * * * /path/to/tdarr-autoscaler.py >> /path/to/tdarr-autoscaler.log 2>&1
+"""
+
+import datetime as _dt
+import json as _json
+from typing import List
+
+import requests
+
+
+#######################
+# CONFIGURATION
+#######################
+
+# Tdarr settings
+TDARR_URL = "http://tdarr-ip:port"
+
+# Worker type - what does your Tdarr use for transcoding?
+# Options: "GPU" (Intel QSV, NVENC, etc.), "CPU" (software encoding), or "BOTH"
+WORKER_TYPE = "GPU"
+
+# Tautulli settings
+TAUTULLI_URL = "http://tautulli-ip:port"
+TAUTULLI_API_KEY = ""  # Settings > Web Interface > API Key
+
+# Do not count Direct Play / Direct Stream since they are very easy on CPU/GPU
+COUNT_TRANSCODES_ONLY = True
+
+# Worker limits - adjust to your hardware capability
+WORKERS_IDLE = 1          # No one watching (daytime)
+WORKERS_ACTIVE = 0        # Someone is streaming
+WORKERS_NIGHT = 1         # No one watching (night)
+WORKERS_NIGHT_ACTIVE = 0  # Streaming during night
+
+# Night mode hours (24h format)
+NIGHT_START = 0   # Midnight
+NIGHT_END = 5     # 5 AM
+
+#######################
+# SCRIPT - no edits needed below
+#######################
+
+def _now_stamp() -> str:
+    return _dt.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+
+
+def _error_exit(msg: str, code: int = 1) -> None:
+    print(f"[{_now_stamp()}] ERROR: {msg}")
+    raise SystemExit(code)
+
+
+def _get_json(url: str, timeout: int = 10) -> dict:
+    try:
+        r = requests.get(url, timeout=timeout)
+        r.raise_for_status()
+        return r.json()
+    except Exception as e:
+        _error_exit(f"HTTP/JSON error fetching {url}: {e}")
+
+
+def _post_json(url: str, payload: dict, timeout: int = 10) -> None:
+    try:
+        r = requests.post(
+            url,
+            headers={"Content-Type": "application/json"},
+            data=_json.dumps(payload),
+            timeout=timeout,
+        )
+        r.raise_for_status()
+    except Exception as e:
+        _error_exit(f"HTTP error POST {url}: {e}")
+
+
+def _worker_types_from_friendly(name: str) -> List[str]:
+    if name == "GPU":
+        return ["transcodegpu"]
+    if name == "CPU":
+        return ["transcodecpu"]
+    if name == "BOTH":
+        return ["transcodegpu", "transcodecpu"]
+    _error_exit("Invalid WORKER_TYPE. Use 'GPU', 'CPU', or 'BOTH'")
+
+
+def _get_first_node_id(tdarr_url: str) -> str:
+    nodes = _get_json(f"{tdarr_url}/api/v2/get-nodes")
+    if not isinstance(nodes, dict) or not nodes:
+        return ""
+    return next(iter(nodes.keys()), "")
+
+
+def _is_night(hour: int, night_start: int, night_end: int) -> bool:
+    if night_start < night_end:
+        return (hour >= night_start) and (hour < night_end)
+    else:
+        return (hour >= night_start) or (hour < night_end)
+
+
+def _get_streams_tautulli(tautulli_url: str, api_key: str) -> int:
+    data = _get_json(f"{tautulli_url}/api/v2?apikey={api_key}&cmd=get_activity")
+    try:
+        streams = (
+            data.get("response", {})
+            .get("data", {})
+            .get("stream_count", 0)
+        )
+    except Exception:
+        streams = 0
+
+    if streams is None:
+        return 0
+    try:
+        return int(streams)
+    except Exception:
+        return 0
+
+def _get_transcodes_tautulli (tautulli_url: str, api_key: str) -> int:
+    data = _get_json(f"{tautulli_url}/api/v2?apikey={api_key}&cmd=get_activity")
+    try:
+        sessions = (
+        data.get("response", {})
+        .get("data", {})
+        .get("sessions", [])
+    )
+    except Exception:
+        return 0
+
+    if not isinstance(sessions, list):
+        return 0
+
+    return sum(
+        1
+        for s in sessions
+        if isinstance(s, dict) and s.get("video_decision") == "transcode"
+    )
+
+def _get_current_worker_limit(tdarr_url: str, node_id: str, worker_type: str) -> int:
+    nodes = _get_json(f"{tdarr_url}/api/v2/get-nodes")
+    try:
+        val = nodes[node_id]["workerLimits"][worker_type]
+    except Exception:
+        val = 0
+
+    if val is None:
+        return 0
+    try:
+        return int(val)
+    except Exception:
+        return 0
+
+
+def _alter_worker_limit(tdarr_url: str, node_id: str, worker_type: str, process: str) -> None:
+    payload = {"data": {"nodeID": node_id, "workerType": worker_type, "process": process}}
+    _post_json(f"{tdarr_url}/api/v2/alter-worker-limit", payload)
+
+
+def main() -> None:
+    worker_types = _worker_types_from_friendly(WORKER_TYPE)
+
+    node_id = _get_first_node_id(TDARR_URL)
+    if not node_id or node_id == "null":
+        _error_exit("Could not get Tdarr node ID")
+
+    hour = int(_dt.datetime.now().strftime("%H"))
+
+    is_night = _is_night(hour, NIGHT_START, NIGHT_END)
+    time_mode = "Night" if is_night else "Day"
+
+    if COUNT_TRANSCODES_ONLY:
+        streams = _get_transcodes_tautulli(TAUTULLI_URL, TAUTULLI_API_KEY)
+        stream_type = "Transcodes"
+    else:
+        streams = _get_streams_tautulli(TAUTULLI_URL, TAUTULLI_API_KEY)
+        stream_type = "Streams"
+
+    if streams is None:
+        streams = 0
+    try:
+        streams = int(streams)
+    except Exception:
+        streams = 0
+
+    if is_night:
+        if streams == 0:
+            target_workers = WORKERS_NIGHT
+        else:
+            target_workers = WORKERS_NIGHT_ACTIVE
+    else:
+        if streams == 0:
+            target_workers = WORKERS_IDLE
+        else:
+            target_workers = WORKERS_ACTIVE
+
+    output = ""
+    for tdarr_worker_type in worker_types:
+        if tdarr_worker_type == "transcodegpu":
+            type_label = "GPU Workers"
+        else:
+            type_label = "CPU Workers"
+
+        current = _get_current_worker_limit(TDARR_URL, node_id, tdarr_worker_type)
+
+        if current != target_workers:
+            original = current
+            if current < target_workers:
+                while current < target_workers:
+                    _alter_worker_limit(TDARR_URL, node_id, tdarr_worker_type, "increase")
+                    current += 1
+                diff = f"+{target_workers - original}"
+            else:
+                while current > target_workers:
+                    _alter_worker_limit(TDARR_URL, node_id, tdarr_worker_type, "decrease")
+                    current -= 1
+                diff = f"-{original - target_workers}"
+            output += f" | {type_label}: {target_workers} ({diff})"
+        else:
+            output += f" | {type_label}: {target_workers} (no change)"
+
+    print(f"[{_now_stamp()}] {stream_type}: {streams} | Mode: {time_mode}{output}")
+
+
+if __name__ == "__main__":
+    main()