---
title: "Third-party VAST Specifications"
slug: "third-party-vast-specifications"
updated: 2023-05-03T16:29:12Z
published: 2023-05-03T16:29:12Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://info.transmit.live/llms.txt
> Use this file to discover all available pages before exploring further.

# Third-party VAST Specifications

Third-party VAST tags are supported. Please review the table below to ensure the VAST tags you intend to use with Transmit are compatible.

| **Transmit Traffic Contact** | Josh Kersner [josh@transmit.live](mailto:josh@transmit.live) |
| --- | --- |
| **Third-party Hosted Video - Traffic Instructions** | * All tags must be SSL compliant (HTTP) Third-party tags must be able to serve via SSL (https://).All subsequent calls to third parties after the initial ad request must also use SSL. |
| **VAST2 (Desktop, Mobile, OTT):** | - VAST2 REQUIRED for Desktop, Mobile and OTT. - H.264 (MP4) assets must be included in the VAST Tag - A minimum of three different bit rates need to be included. (Recommended bitrates are below) |
| **VAST Transcodes** | **Bit rate** | **Codecs****Accepted** | **Min Dimensions** | **Max File Size** | Required for OTT and SSAI environments |
| 8 – 30 Mbps | H.264 (MP4) | 1920x1080 | 1.7GB Max |
| **Transcodes listed below are required in all VAST tags** |
| **Bit rate** | **Codecs****Accepted** | **Min Dimensions** | **:15** | **:30** |
| 3,000 kbps+ | H.264 (MP4) | 1280x720 | 4.5MB | 9MB |
| 1,200 kbps+ | H.264 (MP4) | 854x480 | 3.4MB | 7MB |
| 500 kbps+ | H.264 (MP4) | 640x360 | 1.8MB | 3.5MB |
| **Audio Codec** | - Peak audio range between -12db and -24db Stereo - 44.1 -48kHz sampling rate - AAC-LC |
| **VPAID** | Not supported |
| **Aspect Ratio** | 16:9 |
| **Ad Dimensions** | - 1920x1080 - 1280x720 - 854x480 - 640x360 |
| **Brand Safety Tags** | - Monitoring tags only. - Blocking tags are not accepted |
| **Notes** | - Skippable ads are not accepted. Please DO NOT include .3GPP file format. - A maximum of 1 VAST wrapper redirects. |