Any suggestions about converting a serial of png files with mp4 video format and saving as a file?

If I want to render the game view , save as png files.
Then I want to convert these png files with mp4 video format and save as a mp4 file.

Any suggestions? or another way to do it?

Am sure there is a video editing group somewhere that can advise you on the PNG to MP4 conversion. That’s not related to Unity, however.