Updating GPU transcoding

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: