By john Synthesia makes it easy to create avatar-led videos, but a rendering error partway through can be a real setback when you’re on a deadline. Most rendering errors are tied to the script or media used rather than the platform itself.
Because the avatar has to synchronize speech, lip movement, and any background media all at once, a single unusual element in your project is often enough to interrupt the entire RAFFIPLAY render.
Possible Causes
- Special characters or formatting issues in your script text can interrupt the text-to-speech rendering process.
- Uploaded background images or videos that are too large or in an unsupported format can cause failures.
- Very long video projects can occasionally hit a processing timeout on the server side.
- Temporary server congestion during busy periods can delay or interrupt rendering unexpectedly.
- Mixing multiple avatar or voice styles within a single project can sometimes create sync conflicts.
- Third-party antivirus or firewall software can sometimes interfere with how the app connects to its servers.
Initial Troubleshooting Steps
- Review your script for unusual symbols, emojis, or formatting that might not be supported, and remove them.
- Check that any uploaded media files match Synthesia’s recommended format and size guidelines.
- Try rendering a shorter test clip from the same project to isolate whether length is the issue.
Advanced Steps
- Break a long video into multiple shorter segments and render them separately before combining.
- Replace unsupported media files with a supported format, such as standard MP4 or PNG.
- Refresh your browser and resubmit the render job, since a stuck session can sometimes cause errors.
- Simplify a project using multiple avatars or voices into a single consistent style to test for conflicts.
- Keeping every app, browser, and plugin connected to a Synthesia Avatar Video Rendering Error updated is one of the simplest habits that prevents this from resurfacing.
Security and Data Warning
Only upload media you have the rights to use, and avoid uploading sensitive internal company footage to test unrelated rendering issues.
When to See a Technician
If rendering errors continue after cleaning up the script and media files, contact Synthesia support with the project link so their team can check server-side logs.
Conclusion
Rendering errors in Synthesia are usually tied to script formatting or media files rather than a broken platform. Cleaning up your inputs resolves the issue for most projects without needing to rebuild them from scratch. With a stable connection, updated software, and the steps above, most people find the issue resolved well before it becomes a serious disruption.