return None
if format_spec == 'best' or format_spec is None:
- return available_formats[-1]
+ audiovideo_formats = [
+ f for f in available_formats
+ if f.get('vcodec') != 'none' and f.get('acodec') != 'none']
+ if audiovideo_formats:
+ return audiovideo_formats[-1]
+ # for audio only urls, 'best' selects the best audio format
+ elif all(f.get('acodec') != 'none' for f in available_formats):
+ return available_formats[-1]
elif format_spec == 'worst':
audiovideo_formats = [
f for f in available_formats