Introduction
Fox CTV specifications define delivery requirements for video ad creatives across Fox Network Group inventory. Creatives must be delivered cut to time with no slates, countdowns, or added black frames. Audio and video must begin at the first frame. For third-party VAST or VPAID specifications and approved vendor confirmation, contact your FNG account team directly.
Publisher
- • VAST version: 2.0 only · JavaScript in VAST: not permitted
- • Resolution: 1920×1080 progressive · Aspect ratio: 16:9
- • Bitrate: 15 - 30 Mbps preferred · CBR only (VBR not permitted)
- • Codec: H.264 or ProRes HQ (preferred) · .mp4 · Max: 5 GB
- • Frame rate: 23.98, 25, or 29.97 fps · native only
- • Creative delivery: cut to time · no slates, countdowns, or black frames
- • Wrapped tags: Not supported. Monitoring pixels only.
Specifications
VAST and tag requirements
| Spec | Details |
|---|---|
| VAST Supported | Yes |
| VAST Version | 2.0 ONLY |
| JavaScript in VAST | Not permitted |
| VPAID Supported | No, contact FNG account team for 3rd party VAST or VPAID specifications |
| 3rd Party Tags | Yes, contact FNG account team for approved vendor list and specifications |
| Preferred Vendors | Please check with Account Manager |
| Wrapped Tags | Not supported. Monitoring pixels only. |
| Trackers | Must be validated against publisher-approved vendors |
Video specifications
| Spec | Details |
|---|---|
| Resolution | 1920×1080 |
| Scan Type | Progressive |
| Aspect Ratio | 16:9 |
| Bitrate | 15 - 30 Mbps preferred |
| Bitrate Type | Constant Bit Rate (CBR) only |
| File Format | .mp4 |
| Codec | H.264 or ProRes HQ (preferred) |
| Max File Size | 5 GB |
| Frame Rate | 23.98, 25, or 29.97 fps based on native frame rate |
| Creative Delivery | Cut to time. No slates, countdowns, or added black frames. Audio and video must begin at first frame |
Audio specifications
| Spec | Details |
|---|---|
| Audio Required | Yes |
| Channels | 2-channel only |
| Codec | PCM or AAC |
| Bitrate | 192 kbps minimum |
| Bit Depth | 16-bit or 24-bit |
| Sample Rate | 48 kHz |
| Average Loudness | -24 to -28 LKFS |
| Dialogue Normalization | Set at -24 |
- For 3rd party VAST or VPAID specifications and approved vendor confirmation, contact your FNG account team directly.
- Wrapped tags are not supported, only monitoring pixels are allowed.
- Trackers must be validated against publisher-approved vendors. Confirm approved list with Account Manager.
- Creatives must be delivered cut to time with no slates, countdowns, or added black frames.
- Audio and video must begin at the first frame.
- CBR is the only accepted bitrate type. VBR is not permitted.
- Average loudness must be between -24 and -28 LKFS with dialogue normalization set at -24.
Spec guide
FAQs
Can VPAID or third-party VAST details be used without Fox account approval?
Third-party VAST and VPAID specifications require direct confirmation from the Fox account team. Without approval, these formats are not guaranteed to be supported and may fail validation during trafficking or quality checks.
What happens if a Fox CTV ad does not start at the first frame?
Ads that do not begin at the first frame do not meet Fox CTV delivery requirements. This causes playback failure or rejection because audio and video must start immediately without pre-roll elements such as slates or black frames.
Why is constant bit rate required for Fox CTV creatives?
Fox CTV requires constant bit rate encoding to ensure predictable playback quality across devices. Variable bitrate is not permitted because it can cause inconsistent streaming performance and violate strict delivery specifications.