diff --git a/app/worker.py b/app/worker.py
index 96e7ca1..510a401 100644
--- a/app/worker.py
+++ b/app/worker.py
@@ -1467,6 +1467,34 @@ def _resolve_audio_encoder(codec: str) -> str:
     return AUDIO_ENCODER_MAP.get(key, codec or "libmp3lame")
 
 
+def _sanitize_video_preset(encoder: str) -> str | None:
+    preset = (VIDEO_NORMALIZE_PRESET or "").strip()
+    if not preset:
+        return None
+    enc = (encoder or "").lower()
+    pl = preset.lower()
+
+    if "nvenc" in enc:
+        allowed = {"p1", "p2", "p3", "p4", "p5", "p6", "p7"}
+        return pl if pl in allowed else "p5"
+
+    if enc in {"libx265", "libx264"}:
+        allowed = {"ultrafast", "superfast", "veryfast", "faster", "fast", "medium", "slow", "slower", "veryslow", "placebo"}
+        if pl in allowed:
+            return pl
+        if pl.startswith("p") and pl[1:].isdigit():
+            return "medium"
+        return "medium"
+
+    if enc == "libaom-av1":
+        allowed = {"good", "best", "realtime"}
+        if pl in allowed:
+            return pl
+        return "good"
+
+    return preset
+
+
 def _ffprobe_streams(path: Path) -> dict[str, str]:
     try:
         out = subprocess.check_output(
@@ -1603,8 +1631,9 @@ def _normalize_video_file(path: Path, info: dict[str, str]) -> Path:
             "-map", "0",
             "-c:v", v_encoder,
         ]
-        if VIDEO_NORMALIZE_PRESET:
-            cmd.extend(["-preset", VIDEO_NORMALIZE_PRESET])
+        preset_val = _sanitize_video_preset(v_encoder)
+        if preset_val:
+            cmd.extend(["-preset", preset_val])
         if VIDEO_NORMALIZE_TUNE:
             cmd.extend(["-tune", VIDEO_NORMALIZE_TUNE])
         if VIDEO_NORMALIZE_CRF:
diff --git a/docker-compose.yml b/docker-compose.yml
index fae02b8..41659d5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -90,6 +90,8 @@ services:
       AUDIO_NORMALIZE_BITRATE: ${AUDIO_NORMALIZE_BITRATE:-192k}
       AUDIO_NORMALIZE_CHANNELS: ${AUDIO_NORMALIZE_CHANNELS:-2}
       WORKER_MODE: all
+      NVIDIA_VISIBLE_DEVICES: ${NVIDIA_VISIBLE_DEVICES:-all}
+      NVIDIA_DRIVER_CAPABILITIES: ${NVIDIA_DRIVER_CAPABILITIES:-video,compute,utility}
       OPENWEBUI_URL: ${OPENWEBUI_CONTAINER_URL:-http://open-webui:8080}
       OPENWEBUI_API_KEY: ${OPENWEBUI_API_KEY}
       OPENWEBUI_KB_NAME: ${OPENWEBUI_KB_NAME:-Homelab Library}
@@ -105,6 +107,10 @@ services:
       - ${TMP_HOST_DIR:-./tmp}:/tmpdl
       - ${MODELS_HOST_DIR:-./models}:/root/.cache/huggingface
       - ./app:/app
+    device_requests:
+      - driver: nvidia
+        count: ${NVIDIA_DEVICE_COUNT:-1}
+        capabilities: [video, compute, utility]
     depends_on: [meili, redis, open-webui]
     restart: unless-stopped
     healthcheck:
@@ -150,6 +156,8 @@ services:
       AUDIO_NORMALIZE_BITRATE: ${AUDIO_NORMALIZE_BITRATE:-192k}
       AUDIO_NORMALIZE_CHANNELS: ${AUDIO_NORMALIZE_CHANNELS:-2}
       WORKER_MODE: transcribe
+      NVIDIA_VISIBLE_DEVICES: ${NVIDIA_VISIBLE_DEVICES:-all}
+      NVIDIA_DRIVER_CAPABILITIES: ${NVIDIA_DRIVER_CAPABILITIES:-video,compute,utility}
       OPENWEBUI_URL: ${OPENWEBUI_CONTAINER_URL:-http://open-webui:8080}
       OPENWEBUI_API_KEY: ${OPENWEBUI_API_KEY}
       OPENWEBUI_KB_NAME: ${OPENWEBUI_KB_NAME:-Homelab Library}
@@ -165,6 +173,10 @@ services:
       - ${TMP_HOST_DIR:-./tmp}:/tmpdl
       - ${MODELS_HOST_DIR:-./models}:/root/.cache/huggingface
       - ./app:/app
+    device_requests:
+      - driver: nvidia
+        count: ${NVIDIA_DEVICE_COUNT:-1}
+        capabilities: [video, compute, utility]
     depends_on: [meili, redis, open-webui]
     restart: unless-stopped
     healthcheck: