: For older 326 ppi devices (like iPhone 5c), the standard was H.264 video up to 1080p at 30 frames per second .
The number is the signature pixel density (PPI) for Apple's original Retina Display . 326 mp4
: Usually paired with AAC-LC audio up to 160 Kbps. 3. "Deep Text" and Research : For older 326 ppi devices (like iPhone