Fix Choppy streaming 2

app.py

@@ -4,7 +4,7 @@ import sys
 from pathlib import Path
 
 from dotenv import load_dotenv
-from flask import Flask, Response, abort, render_template, request
+from flask import Flask, Response, abort, render_template, request, send_file
 
 load_dotenv()
 
@@ -52,12 +52,12 @@ def play(path):
 @app.route("/video/<path:path>")
 def serve_video(path):
     full = _validate_path(path)
-    file_size = full.stat().st_size
     range_header = request.headers.get("Range")
 
     if not range_header:
-        return _stream_file(full, 0, file_size - 1, file_size, 200)
+        return send_file(full, mimetype="video/mp4", conditional=True)
 
+    file_size = full.stat().st_size
     match = re.match(r"bytes=(\d+)-(\d*)", range_header)
     if not match:
         abort(416)
@@ -70,31 +70,28 @@ def serve_video(path):
         abort(416)
 
     content_length = end - start + 1
-    return _stream_file(full, start, end, content_length, 206)
+    return _stream_range(full, start, end, content_length, file_size)
 
 
-def _stream_file(path, start, end, content_length, status):
+def _stream_range(path, start, end, content_length, file_size):
     def generate():
         with open(path, "rb") as f:
             f.seek(start)
             remaining = content_length
             while remaining > 0:
-                chunk_size = min(8192, remaining)
+                chunk_size = min(65536, remaining)
                 data = f.read(chunk_size)
                 if not data:
                     break
                 remaining -= len(data)
                 yield data
 
-    file_size = path.stat().st_size
     headers = {
         "Content-Range": f"bytes {start}-{end}/{file_size}",
         "Accept-Ranges": "bytes",
         "Content-Length": str(content_length),
         "Content-Type": "video/mp4",
     }
-    return Response(generate(), status=status, headers=headers)
-
-
+    return Response(generate(), status=206, headers=headers)
 if __name__ == "__main__":
-    app.run(host=FLASK_HOST, port=FLASK_PORT, debug=True)
+    app.run(host=FLASK_HOST, port=FLASK_PORT, debug=True, threaded=True)

templates/play.html

@@ -12,7 +12,7 @@
 <body>
   <p><a href="/">&larr; Back to listing</a></p>
   <h2>{{ filename|e }}</h2>
-  <video controls autoplay>
+  <video controls autoplay preload="auto">
     <source src="/video/{{ path|e }}" type="video/mp4">
   </video>
 </body>