elearning.py: fix bug when video has no description

python/elearning.py

@@ -250,6 +250,10 @@ def save_video(infos, files, args):
     urls = (i['downloadUrl'] for i in infos)
     info = infos[0]
 
+    # fallback to name if no description
+    if not info['description']:
+        info['description'] = info['name']
+
     # use the description as a filename
     title = []
     for word in info['description'].split():
@@ -282,7 +286,7 @@ def save_video(infos, files, args):
     ffmpeg = [
         'ffmpeg', '-hide_banner',
         '-loglevel', 'error',
-        '-stats', '-y'
+        '-stats'
     ] + inputs + maps + args.ffmpeg + [
         # video
         '-c:v', 'libx265', '-preset', 'slow', '-crf', '23',
@@ -361,10 +365,10 @@ def main(args):
             else:
                 print('url:', info[0]['downloadUrl'])
             printr()
-        if args.json:
-            output.append(info)
         else:
             save_video(info, files, args)
+        if args.json:
+            output.append(info)
 
     if args.json:
         print(json.dumps(output))