Input error
Some dubs fail because the source video itself can't be processed. The error happens early — usually before transcription — and the status panel marks the dub with an input error. This isn't a server issue you can wait out. The fix is on your side: replace or repair the source.
Common causes
Unsupported format. Most videos work, but some unusual containers or codecs don't. Re-encode to MP4 (H.264 + AAC) and try again.
Corrupt file. The upload completed but the file itself is damaged. Open it in a video player to confirm it plays cleanly. If it doesn't, re-export it from your editor.
No detectable speech. Pure music, ambient video with no narration, or audio so quiet that voice can't be separated from background. Make sure there's clear, audible speech in your source.
Wrong source language. You picked a source language that doesn't match what's actually spoken. Pick the right one and retry.
DRM-protected file. Files exported from some platforms include DRM that blocks processing. Re-export without DRM.
URL imports that don't return a video. When importing from a URL, the server has to be able to fetch the file directly. Private links, expiring tokens, or login-protected URLs won't work.
How to fix it
Check that the file plays in a normal video player. If it doesn't, re-export it.
Re-encode to MP4 (H.264/AAC) if you're not sure about the format. This is the most reliable container.
Confirm the source language matches what's actually being spoken.
For URL imports, try a direct file URL or upload the file instead.
Start a new dub with the corrected source. Editing the failed one won't fix an input problem.
When to contact support
If your file plays cleanly in a normal player, is in a standard format, contains clear speech in the language you selected, and still fails — send us the file (or a link to it) and the dub URL.