VAST tag technical specs

Asset formats	Vertical Video (9:16)	Square Video (1:1)	Horizontal Video (16:9)
Ad formats	Pre-roll video ads	Pre-roll video ads	Pre-roll video ads Outstream video ads
Aspect ratio	9:16 [720p minimum]	1:1 [720p minimum]	16:9 [720p minimum]
Video codec	H.264	H.264	H.264
Video bitrate	600–800 kbps (recommended)	600–800 kbps (recommended)	600–800 kbps (recommended)
Audio codec	Uncompressed	Uncompressed	Uncompressed
Audio sample rate	44.1kHz (minimum)	44.1kHz (minimum)	44.1kHz (minimum)
Duration	5 seconds minimum; 30 seconds maximum	5 seconds minimum; 30 seconds maximum	5 seconds minimum; 30 seconds maximum
Max file size	250 MB (MOV, M4V, MP4)	250 MB (MOV, M4V, MP4)	250 MB (MOV, M4V, MP4)

VAST tags are supported for devices running iOS 12 and later.
Workbench and Google Ad Manager support outstream video ad specs and pre-roll video ad specs.
Only VAST 2.0 and 3.0 tags containing linear ads and skippable linear ads are supported.
Progressive loading only.
Apple IPs (17.*) Allow Listed or not blocked.
VPAID, VAST 1.0, VAST 4.0 tags aren’t supported.
VAST tags aren’t supported for Google Campaign Manager on Apple News.
HTTPS protocol is required.
Macros embedded within ad or VAST tags aren’t supported and should be removed from tags for use on Apple News. Macros usually begin with a % sign. These will not be expanded and may cause the tags to function incorrectly.