I tried to input an old 640x480 video, works perfectly fine in all players, no issues, but once I input into Video AI, the software swap the resolution and put 480x640, my video is not 4:3 anymore, it is something weird narrow. I tried crop, and other options, but the preview and the conversion is in this weird format.
I can only suggest using a custom resolution, selecting square pixels, unlocking the aspect ratio and then forcing the correct pixel dimensions. I don’t know whether that will work correctly inside TVAI, as I don’t have any vids where the SAR is totally wrong. The DAR can be corrected in a utility like mkvtoolnix after export (the correct DAR is the reason why the original can playback correctly in most media players as they normally prioritize DAR).
I tried every single option, nothing worked, I will try your second suggestion mkvtoolnix my concern is this video is very old and avi, at least 10 years old, I don’t know if the mkvtoolnix will open avi, but I will try tomorrow, thank you!
The original file already has the correct DAR (the SAR is wrong in the original) so I don’t think mkvtoolnix will help there. It would be the TVAI export that requires it’s DAR changed.
Edit: Or as just suggested by ssbroly, transcode the original.