Output format not recognized by leading photography website

I bought this app to do a simple conversion of an AVI file to MP4 or MOV format for upload to a subscription-only photo and video sharing website. I’ve used the service for 10 years without problem. My converted AVI file (to MP4 format) wasn’t recognized by that site. Customer Service there says the file format isn’t recognized because the file is corrupted. Not a happy camper. And even it the file format were recognized I’d be an unhappy camper because the resolution of the output file is abysmal. There are free apps that may be a bit more complicated to use but deliver uncorrupted output in better resolution.

bluesloverinNPB about AnyVideo Converter HD, v3.0.1