Migrate search to Vertex AI and enhance preview modal

worker/downloader.py

@@ -28,7 +28,7 @@ def run(cmd):
 
 def parse_duration(value):
     if value is None:
-        return "00:00:10"
+        return "00:00:00"
     total = int(float(value))
     hours = total // 3600
     minutes = (total % 3600) // 60
@@ -61,6 +61,24 @@ def build_quality_options(formats: List[dict]):
     return options
 
 
+def preview_stream_url(url):
+    candidates = [
+        "best[ext=mp4]/best",
+        "best",
+    ]
+    for selector in candidates:
+        proc = subprocess.run(
+            ["yt-dlp", "-g", "--no-playlist", "-f", selector, url],
+            capture_output=True,
+            text=True,
+        )
+        if proc.returncode == 0:
+            lines = [line.strip() for line in proc.stdout.splitlines() if line.strip()]
+            if lines:
+                return lines[0]
+    return ""
+
+
 def probe(url):
     cmd = ["yt-dlp", "--dump-single-json", "--no-playlist", url]
     proc = run(cmd)
@@ -71,6 +89,7 @@ def probe(url):
     preview = {
         "title": payload.get("title") or "Untitled",
         "thumbnail": thumbnail,
+        "previewStreamUrl": preview_stream_url(url),
         "durationSeconds": duration or 0,
         "duration": parse_duration(duration),
         "startDefault": "00:00:00",
@@ -85,8 +104,8 @@ def main():
     parser.add_argument("--mode", choices=["probe", "download"], default="download")
     parser.add_argument("--url", required=True)
     parser.add_argument("--start", default="00:00:00")
-    parser.add_argument("--end", default="00:00:10")
-    parser.add_argument("--output", required=True)
+    parser.add_argument("--end", default="00:00:00")
+    parser.add_argument("--output", default="")
     parser.add_argument("--quality", default="best")
     args = parser.parse_args()
 
@@ -94,6 +113,8 @@ def main():
         probe(args.url)
         return
 
+    if not args.output:
+        raise RuntimeError("output path is required for download mode")
     os.makedirs(os.path.dirname(args.output), exist_ok=True)
     emit("starting", 5, "Resolving media stream")