28 Dec 2023 — The first of these lines causes the file filename.avi to be written, but the second line doesn't cause filename.mp4 to be written: MP4 files explained: How to open and use - Adobe

: While mp4v is standard, some systems (like macOS) may require FMP4 or avc1 to display correctly in certain players.

: For MP4 files, the mp4v codec is widely used. You can define it using: fourcc = cv2.VideoWriter_fourcc(*'mp4v') .

: Always close the writer to ensure the file is saved correctly. out.release() . Common Technical Hurdles

vid_522.mp4