How to fix a finished video that plays its sound but shows no picture
Tell Vizard Agent what you see, for example that the link plays sound with no picture. It checks the file's video format before anything else. When the picture is in a format many browsers can't decode, such as 10-bit HEVC, it re-encodes only the picture to standard H.264, copies the sound untouched, and proves both survived.
What do you type into Vizard Agent?
Describe exactly what happens when you open the file and where you opened it, such as a browser or a phone. A video that plays only its sound usually still has its picture inside. The player just can't decode it, and that points Vizard Agent at the format, not the edit.
The link you sent plays the sound but there's no picture. Please send a version that plays in a normal browser.
What does Vizard Agent actually do?
It assumes the picture is still there and checks why it isn't showing. Footage that passes through an edit untouched keeps whatever format it arrived in, and a high-end master can carry a picture format that browsers handle poorly. In the session behind this article it:
- Had replaced one graphic in a 7.5-minute training master by re-encoding only that scene and copying the rest, so the master's 10-bit HEVC picture was carried through unchanged.
- On the complaint, probed the delivered file and found that 10-bit HEVC picture, a format many browsers can't play.
- Timed a 30-second test encode to budget the full render, then re-encoded the picture alone to standard 8-bit H.264 and copied the sound as it was.
- Confirmed the decoded audio matched the original exactly, and checked frames at eight timestamps, including the replaced scene.
- Had the uploaded copy reviewed for visible picture and narration before sending the new link.
When does this not work well?
When the picture really is missing. If the file has no video stream at all, because an export failed or only the sound was uploaded, there is nothing to re-encode, and the fix is to go back to the last version that had a picture. Vizard Agent checks for that first.
Common questions
Is my picture lost? Usually not. Vizard Agent checks the video format first.
Will the sound change? No. Vizard Agent copies it and checks it matches exactly.
Will the quality drop? Barely. Vizard Agent re-encodes the picture at high quality.