BREAKING
HeyGen Adds Transparent WebM Output
Set output_format: webm
MP4 vs Transparent WebM
MP4Old
●No alpha channel
●Manual cleanup needed
WebMNew
●Real alpha channel
●Ready to composite
Self-Contained WebM Request
1Set output_format webm
↓
2Auto background removal
↓
3background param rejected
Matting Required, Cross-Engine
Supported
●Digital Twin & Studio
●Avatar III, IV, V
Not Supported
●Older avatars error
●Cinematic Avatars
API, CLI, and MCP
AI NEWS BLITZ
HeyGen now delivers AI avatars with real transparency and no green screen.