Google and xAI only allow 720p when you start adding references, and neither allow you to sync to audio. This is entirely because of deepfakes. Apparently See

Google and xAI only allow 720p when you start adding references, and neither allow you to sync to audio. This is entirely because of deepfakes. Apparently Seedance has a version without guardrails if you are a licensed production company. I suspect Google Omni would too, but I don't know anyone who uses that model.