now with auto-naming output

bin/vc

@@ -1,7 +1,14 @@
 #! /usr/bin/python
 """Call ffmpeg with youtube-dl to convert files or youtube videos to mp4 or webp files."""
 
-import subprocess, argparse
+import subprocess, argparse, re
+
+def get_video_title(input_path: str) -> str:
+    if "https" in input_path:
+        title = subprocess.run(["yt-dlp", "--get-title", input_path], capture_output=True, encoding='utf-8')
+        return re.sub(r'[\W]+', '_', title.stdout.strip()) + ".mp4"
+    else:
+        return "vc"+input_path
 
 def get_input_args(input_path: str) -> list[str]:
     """Generate ffmpeg input arguments for either local files or YouTube URLs."""
@@ -76,7 +83,7 @@ def get_video_filter(crop_arg: str | None) -> str:
 def main():
     parser = argparse.ArgumentParser(description='Call ffmpeg for converting small video files to mp4 or webp')
     parser.add_argument('input', help='input file or url')
-    parser.add_argument('output', help='output filename')
+    parser.add_argument('output', nargs='?', default="", help='output filename')
     parser.add_argument('-s', '--start', help='start time, if not 00:00')
     parser.add_argument('-t', '--to', help='end time, if not end of file')
     parser.add_argument('-q', '--quality', help='quality of output, as a percentage')
@@ -88,6 +95,9 @@ def main():
         - Edge: "edge:left:right:top:bottom" or "edge:width:height" or single value for all""")
     args = parser.parse_args()
 
+    if not args.output:
+        args.output = get_video_title(args.input)
+
     f_args = get_input_args(args.input)
 
     f_args += ["-vf", get_video_filter(args.crop)]