Creative — videos
Video creative specs per platform — MP4/MOV, aspect ratio per placement, Wevion accepts up to 4 GB. Captions strongly recommended for sound-off viewing.
Written By Salvatore Sinigaglia
Last updated About 5 hours ago
Video creative specs per platform — MP4/MOV, aspect ratio per placement, Wevion accepts up to 4 GB. Captions strongly recommended for sound-off viewing.
Creative — videos
Upload videos in Campaign Creator's creative step. MP4 / MOV / WebM, Wevion accepts uploads up to 4 GB (Meta duration limit 240 min). Aspect ratio matters per placement: 9:16 vertical for Stories/Reels/TikTok, 1:1 square for Feed, 16:9 landscape for YouTube. Captions strongly recommended — most users watch sound-off.
Who is this for
Mediabuyers + creative producers preparing video assets. Anyone wondering why their high-res 4K video upload is taking so long, or why their TikTok ad got rejected for aspect ratio.
The 3 most-common aspect ratios
Multi-aspect upload: provide 2-3 sizes per ad for full placement coverage.
Per-platform specs
Meta
TikTok
YouTube (via Google Video / Performance Max)
Snapchat
Taboola
Upload pipeline
When you upload a video:
- Front-end: drag-and-drop OR click Upload OR pick from Creative Hub
- Backend: file uploaded to Wevion storage
- Async processing via SQS worker:
- Validates format + duration + aspect
- Extracts thumbnail (or uses your supplied thumbnail)
- Normalizes to platform-compatible encoding (H.264 video + AAC audio)
- Generates derived assets (different resolutions if needed)
- Once processed: video ready in Creative Hub + Campaign Creator
Processing time: typically 30 sec - 5 min depending on size + format.
Captions
Critical: 80%+ of social video views happen with sound OFF (Facebook stat). Captions are essential:
Wevion accepts SRT files alongside video uploads.
Best practice: design video for both sound-on AND sound-off. Burn in key text + use SRT for accessibility.
Thumbnail
Each video has a thumbnail (the still image shown before play):
- Auto-extracted: Wevion picks frame at 1 second
- Manual selection: pick a different frame in Wevion's video preview
- Custom upload: provide a separate thumbnail image (same aspect ratio as video)
Custom thumbnails get 2-3x more clicks than auto-extracted. Worth the extra effort for high-spend campaigns.
Watermark policy
- Avoid heavy watermarks (e.g. TikTok watermark, "Posted on Snapchat" watermark)
- Meta/TikTok penalize cross-posted videos with competitor watermarks
- Use native + brand-clean video for each platform
Video length sweet spots
General rule: shorter video = higher completion rate. Test 15s vs 30s versions.
Upload paths
Direct upload
In Campaign Creator creative step → drag-and-drop OR click Upload. Goes to Creative Hub automatically.
From Creative Hub
Pre-upload videos to Hub (gs-117), then pick in Campaign Creator. Lets you tag, categorize, share across campaigns.
AI generation
Creative Hub → Generate → Video:
- Text prompt
- Pick style (cinematic, fast-paced, animated)
- Duration (5-30s typical)
- Output lands in Hub
- Uses AI Credits
Avatar (talking-head)
Creative Hub → Generate → Avatar:
- Text script
- Pick avatar (face, voice)
- Pick language
- Output: video of avatar speaking your script
- Useful for: UGC-style ads, multilingual without re-shooting
Voiceover (TTS)
Creative Hub → Generate → Voiceover (audio only, can be combined with image/video):
- Text script
- Pick voice + language
- Output: audio file
In Wevion's launchers
Express
- One video slot per ad
- Inline upload OR pick from Hub
- Live preview on right with placement toggle
Pro
- Per-ad video config
- Multi-aspect upload (provide 9:16 + 1:1 + 16:9 in one ad)
- Captions / SRT upload
- Thumbnail selector
Bulk Launch
- Per-row video reference (Hub asset ID)
- Bulk-upload videos to Hub first, then reference
Common issues
- "Aspect ratio rejected": TikTok requires strict 9:16; YouTube In-Stream requires 16:9. Re-crop or upload native.
- "File too large": compress (lower resolution, lower bitrate) OR split into shorter clip.
- "Processing stuck > 10 min": large file or queue backlog. Refresh in 10-20 min.
- "Captions don't appear": SRT must match video duration; timing must be valid; file must be uploaded with video, not separately.
- "Thumbnail shows wrong frame": pick a different frame in Wevion's preview OR upload custom thumbnail.
- "Video looks pixelated": source resolution too low for the target placement. Re-upload higher res.
- "Watermark visible — campaign rejected": TikTok-stored or Snap-stored videos have logos. Re-export from original source without watermark.
Best practices
Hook in first 3 seconds
- Most users scroll past in 3 sec
- Front-load value: what's in it for them
- Use motion + visual contrast to stop the thumb
Sound-off design
- Captions burned in
- Key info as visual text overlay
- Don't rely on voiceover alone
Brand visible early
- Logo or brand color in first 3 sec
- Aids brand recall even on short views
Pace matches platform
- TikTok: fast, dynamic, high-energy
- YouTube In-Stream: longer arc, story-driven
- Stories/Reels: snappy, native-feeling, vertical-first
FAQ
What video formats and limits does Wevion support?
Wevion accepts MP4, MOV, and WebM, and validates uploads up to 4 GB (with Meta's own duration limit of 240 minutes), though limits vary by platform — TikTok caps at 500 MB and 60 minutes, Snapchat at 1 GB and 3 minutes, and Taboola at 500 MB. Upload in the Campaign Creator creative step or pick from Creative Hub.
What happens after I upload a video?
After upload, Wevion stores the file and runs async processing via an SQS worker that validates format, duration and aspect, extracts a thumbnail, normalizes to H.264 video plus AAC audio, and generates derived resolutions. Processing typically takes 30 seconds to 5 minutes depending on size and format, after which the video is ready in Creative Hub and Campaign Creator.
Why are captions important for video ads?
Captions are essential because over 80% of social video views happen with sound off. Wevion accepts SRT subtitle files alongside video uploads, and you can also burn captions into the video or use Meta's auto-generated ones. Best practice is to design for both sound-on and sound-off — burn in key text and add SRT for accessibility.
Can I choose the video thumbnail in Wevion?
Yes. Wevion auto-extracts a frame at 1 second, but you can pick a different frame in the video preview or upload a custom thumbnail matching the video's aspect ratio. Custom thumbnails earn 2-3x more clicks than auto-extracted ones, making them worthwhile for high-spend campaigns.