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APP PREVIEWS AND SCREENSHOTS

App preview specifications

You can provide app previews in tH.264 and ProRes 422 (HQ only) formats, with the following specifications.

Video Specifications

	H.264 format	ProRes 422 (HQ only) format
Target bit rate	10-12 Mbps	VBR ~220 Mbps
Video characteristics	Progressive, up to High Profile Level 4.0	Progressive, no external references
Max frame rate	30 frames per second	30 frames per second
Audio	Stereo Codec: 256kbps AAC Sample Rate: 44.1kHz or 48kHz All tracks should be enabled Stereo configuration: 1 track with 2-channel stereo (1st channel L and 2nd channel R) 2 tracks with 1-channel stereo (1st track L and 2nd track R)	Stereo Codec: PCM or 256kbps AAC Bit Depth (for PCM): 16-, 24-, or 32-bit Sample Rate: 44.1 or 48kHz All tracks should be enabled Stereo configuration: 1 track with 2-channel stereo (1st channel L and 2nd channel R) 2 tracks with 1-channel stereo (1st track L and 2nd track R)
Supported extensions	.mov, .m4v, .mp4	.mov

App Preview Resolutions

You can deliver app previews with the following resolutions.

Device or context	Native resolutions	Accepted resolutions
5.8-Inch Super Retina Display	2436 x 1125 pixels	886 x 1920 pixels for portrait 1920 x 886 pixels for landscape
5.5-Inch Retina Display	2208 x 1242 pixels (Rendered Pixels) 1920 x 1080 pixels (Physical Pixels)	1080 x 1920 pixels for portrait 1920 x 1080 pixels for landscape
4.7-Inch Retina Display	1334 x 750 pixels	750 x 1334 pixels for portrait 1334 x 750 pixels for landscape
4-Inch Retina Display	1136 x 640 pixels (16:9 aspect ratio)	1080 x 1920 pixels for portrait 1920 x 1080 pixels for landscape
12.9-Inch Retina Display	2732 x 2048 pixels(4:3 aspect ratio)	1200 x 1600 pixels for portrait 1600 x 1200 pixels for landscape 900 x 1200 pixels for portrait 1200 x 900 pixels for landscape
10.5-Inch Retina Display	2224 x 1668 pixels (4:3 aspect ratio)	1200 x 1600 pixels for portrait 1600 x 1200 pixels for landscape
9.7-Inch Retina Display	2048 x 1536 pixels (4:3 aspect ratio)	900 x 1200 pixels for portrait 1200 x 900 pixels for landscape
Apple TV	1920 x 1080 pixels (16:9 aspect ratio)	1920 x 1080 pixels
Mac	1920 x 1080 pixels (16:9 aspect ratio)	1920 x 1080 pixels

App Preview Requirements

The following are required to create your app preview and upload it to App Store Connect.

Context	Description
Maximum file size	500MB
Minimum length	15 Seconds
Maximum length	30 Seconds
Default poster frame setting	5 Seconds (See Set an app preview poster frame.)
Orientation	Portrait or Landscape (Note: macOS app previews accept landscape only.)
OS device capture and play	iOS 8 or later
Upload and playback on App Store Connect	Safari 8 and macOS 10.10 or later

출처 : https://help.apple.com/app-store-connect/#/dev4e413fcb8