While H.264 files play on almost every device, H.265 offers better compression (smaller file size at the same quality). However, this comes at a cost:
Look at the file extension. If it is .mkv instead of .mp4 , the fixes above still apply—just ensure your player (like VLC or MPC-HC) supports Matroska containers, which all modern ones do. heyzo1122 fix
Happy viewing, and may your playback be smooth and your audio in sync. While H