diff --git a/encode_video.py b/encode_video.py
index b1ef79c..6ecabc7 100755
--- a/encode_video.py
+++ b/encode_video.py
@@ -19,10 +19,12 @@ def encode(input_file, codec):
         ffmpeg_codec = "libx265"
         crf = 26
         folder = "h265"
+        extra_params = ["-crf", str(crf)]
     elif codec == "av1":
-        ffmpeg_codec = "libaom-av1"
-        crf = 32
+        ffmpeg_codec = "av1_nvenc"
+        cq = 32
         folder = "av1"
+        extra_params = ["-pix_fmt", "yuv420p", "-preset", "p4", "-cq", str(cq), "-rc", "vbr", "-b:v", "0"]
     else:
         raise ValueError("Unsupported codec")
 
@@ -37,36 +39,49 @@ def encode(input_file, codec):
     outdir = os.path.join(os.path.dirname(input_file), folder)
     os.makedirs(outdir, exist_ok=True)
     output_file = os.path.join(outdir, f"{name}.mkv")
+    log_file = os.path.join(outdir, f"{name}.log")
 
     cmd = [
         "ffmpeg",
         "-i", input_file,
         "-map", "0",
+    ] + extra_params + [
         "-c:v", ffmpeg_codec,
-        "-crf", str(crf),
         "-c:a", "copy",
         "-c:s", "copy",
         "-y", output_file
     ]
 
     print(f"\n🎬 Encoding {filename} → {folder}/{name}.mkv")
-    process = subprocess.Popen(cmd, stderr=subprocess.PIPE, text=True)
+    with open(log_file, "w") as log:
+        process = subprocess.Popen(cmd, stderr=subprocess.PIPE, stdout=subprocess.PIPE, text=True)
 
-    time_re = re.compile(r"time=(\d+):(\d+):([\d.]+)")
-    last_percent = -1
+        time_re = re.compile(r"time=(\d+):(\d+):([\d.]+)")
+        last_percent = -1
 
-    for line in process.stderr:
-        match = time_re.search(line)
-        if match:
-            h, m, s = map(float, match.groups())
-            current = h * 3600 + m * 60 + s
-            percent = int((current / duration) * 100)
-            if percent != last_percent:
-                print(f"\r⏳ Progress: {percent}%", end='', flush=True)
-                last_percent = percent
+        while True:
+            line = process.stderr.readline()
+            if not line:
+                break
+            log.write(line)
+            match = time_re.search(line)
+            if match:
+                h, m, s = map(float, match.groups())
+                current = h * 3600 + m * 60 + s
+                percent = int((current / duration) * 100)
+                if percent != last_percent:
+                    print(f"\r⏳ Progress: {percent}%", end='', flush=True)
+                    last_percent = percent
 
-    process.wait()
-    print("\n✅ Done.")
+        process.wait()
+
+    if process.returncode != 0:
+        print(f"\n❌ [Error] FFmpeg failed for {filename}. Check the log: {log_file}")
+        # Clean broken output
+        if os.path.exists(output_file):
+            os.remove(output_file)
+    else:
+        print("\n✅ Done.")
 
 def encode_batch(directory, codec):
     if not os.path.isdir(directory):
@@ -77,10 +92,14 @@ def encode_batch(directory, codec):
         for file in files:
             if file.lower().endswith(SUPPORTED_EXTENSIONS):
                 filepath = os.path.join(root, file)
-                encode(filepath, codec)
+                try:
+                    encode(filepath, codec)
+                except Exception as e:
+                    print(f"\n❌ Error with file {file}: {e}")
+                    continue
 
 def main():
-    parser = argparse.ArgumentParser(description="Encode video(s) to x265 or AV1.")
+    parser = argparse.ArgumentParser(description="Encode video(s) to x265 or AV1 with GPU.")
     parser.add_argument("input", nargs="?", help="Path to input file")
     parser.add_argument("-d", "--directory", help="Path to a directory for batch encoding")
     parser.add_argument("--codec", choices=["x265", "av1"], default="x265", help="Codec to use (default: x265)")
@@ -99,4 +118,3 @@ def main():
 
 if __name__ == "__main__":
     main()
-