Synthesia B-roll in 720p, 1080p or 4K vs Sume Avatar 1.0 at 720p
Synthesia lets you pick B-roll resolution (720p, 1080p, 4K) as of Sep 25, 2026. Sume avatar video renders at 720p today; here is how to add b-roll on top.
Synthesia's updates page, dated September 25, 2026, says B-roll can be generated at 720p, 1080p or 4K. Sume Avatar 1.0 does not offer a resolution choice: the avatar video resolution is currently 720p. If you need higher-resolution inserts, you add them as separate clips and combine them in an editor or with Sume's timeline tools.
Resolution facts
Both entries are quoted from vendor pages. Sume's value is in the avatar video docs.
| Fact | Value |
|---|---|
| Synthesia B-roll | 720p, 1080p or 4K (Sep 25) |
| Sume avatar video | 720p currently |
| Sume aspect ratios | 1:1, 3:4, 9:16 (default), 4:3, 16:9 |
What the 720p means in practice
A 720p avatar clip is fine for vertical social placements and web embeds. For a broadcast cut or a large screen, plan for the presenter at 720p and B-roll at whatever you can source. Mixing resolutions in one timeline works if you export to a single target.
Quality tier changes the render model, not the pixel count: standard, plus and max differ in price per second, from $0.184 to $0.55 without a product image.
Build the cutaway
Make the talking head with the script, then generate or source B-roll separately and put it over the audio. The post on adding b-roll to an avatar talking head walks through the pattern.
Keep the avatar audio as the spine and cut visuals over it, so the voice and lips stay in sync.
Sources
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Written by Sume