Having trouble uploading a video NFT

im trying to mint an mp4 video, it’s under 200 mb, and has a standard MP3 file in it for audio. every time i try to upload this piece i get an error that says, "warning this video contains H 265 codec that might not be viewable on certain browsers, we recommend changing to a different codec before minting. After I X out this pop up, the artwork window has a frowny face that says No video with supported mime type found. Does anyone know what I’m doing wrong with my video file to be getting these warnings? Thank you in advance

Was this video rendered with a h265 codec? Most browsers/platforms won’t support this format. How did you render this video?