[core] Don't select storyboard formats as fallback

Closes #7715
Authored by: bashonly

yt_dlp/YoutubeDL.py

@@ -2451,7 +2451,7 @@ class YoutubeDL:
                                 # for extractors with incomplete formats (audio only (soundcloud)
                                 # or video only (imgur)) best/worst will fallback to
                                 # best/worst {video,audio}-only format
-                                matches = formats
+                                matches = list(filter(lambda f: f.get('vcodec') != 'none' or f.get('acodec') != 'none', formats))
                             elif seperate_fallback and not ctx['has_merged_format']:
                                 # for compatibility with youtube-dl when there is no pre-merged format
                                 matches = list(filter(seperate_fallback, formats))