Video
Creative Specifications

Required

Placements

In-stream (pre/mid/post-roll), native video, native outstream, and in-app interstitial video across desktop, mobile, apps, and streaming environments

Recommended

Duration

6, 15, or 30 seconds exactly (±1 second transcode variance); bumpers 3–10 seconds; 60 seconds sparingly for post-roll or extended mid-roll

Aspect Ratio

16:9 preferred; 4:3 only when the source is 4:3

Video Codec

H.264 in web-optimized progressive MP4 (MOOV atom at front); HLS or MPEG-DASH for adaptive delivery

Resolutions

640x360 (low) · 854x480 / 1024x576 (medium) · 1280x720 / 1920x1080 (high) pixels

Bitrate

500–700 kbps low; 700–1,500 kbps medium; 1,500–2,500 kbps at 720p; 2,500–3,500 kbps at 1080p

Frame Rate

Maintain the source frame rate (23.976, 25, or 29.97 fps)

Audio

AAC-LC 128–192 kbps or HE-AACv1 64–128 kbps, stereo, 44.1/48 kHz; loudness -24 LKFS ±2 dB (US)

Sound Default

In-stream (pre/mid/post-roll) plays sound-on by default at start; sound-off placements are out-stream

Companion Banner

300x250, 728x90, 468x60, 300x100, or 300x60 at 200 KB; no audio or video inside the companion

Autoplay Sound

Desktop and mobile video is automatically muted when an impression is served; closed captions are recommended for muted autoplay environments; 30 seconds or less recommended with a hook in the first 3 seconds

Placement-dependent

Stackadapt Technical Limits

Verification required — Containers, codecs, bitrate, frame rate, maximum file size, and VAST/VPAID/SIMID/OMID versions are documented only in the login-gated StackAdapt help center; confirm in the platform console.

Cphere best practice

Not specified by platform