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

1. Check that the file plays in a normal video player. If it doesn’t, re-export it.
2. Re-encode to MP4 (H.264/AAC) if you’re not sure about the format. This is the most reliable container.
3. Confirm the source language matches what’s actually being spoken.
4. For URL imports, try a direct file URL or upload the file instead.
5. 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.