This is usually because the stream is low-fidelity or key elements are obscured. AutoVod relies on the game clock, player names, and character icons being clearly visible.
No, AutoVod only works for Smash Ultimate vods. But the thumbnail generator supports Melee.
It's not possible for AutoVod to support YouTube inputs, and we don't currently support other streaming sites, but you can still use AutoVod by using the upload a video file feature. You can use tools like yt-dlp to download any stream and upload it to AutoVod.
If you have more questions, join the Discord or email nooch@autovod.net