How to stop a caption line flickering off and back on
Tell Vizard Agent the same caption keeps disappearing and coming back. It traces the flicker to captions being emitted one word at a time, rebuilds them as whole sentences that stay on screen for as long as the sentence is being spoken, and moves the word-by-word highlight inside that line instead of replacing the whole line at every word.
What do you type into Vizard Agent?
Describe the behaviour over time rather than the look. "The captions are wrong" could mean almost anything, while "the same caption disappears and then appears again" describes a sequence of events, and a sequence points Vizard Agent straight at the cause. Mention crowded characters too, since both faults come from the same place.
Prompt
What does Vizard Agent actually do?
A caption that flickers is usually not a timing bug. Transcripts arrive word by word with a time on each word, and a caption file built straight from that has one entry per word. It is timed perfectly and still looks like a fault, because nothing stays on screen long enough to read. In the session behind this article it:
- Looked at the screenshot of the fault in a short film and checked how the transcript had been split into caption segments.
- Merged the segments into whole-sentence captions, rebuilt the caption file, adjusted its position and re-rendered.
- Built a check sheet of caption frames across the video and confirmed the characters no longer crowded each other.
- Generated the word-by-word highlight over the whole-sentence layout and reviewed it on its own check sheet.
- Fixed the remaining flicker, re-rendered, confirmed the captions ran continuously with no break, and uploaded the corrected version.
When does this not work well?
Whole-sentence captions need sentences that fit the frame. A very long spoken sentence has to be broken somewhere, and where Vizard Agent breaks it matters: a line split in the middle of a phrase reads much worse than a shorter line that holds. Fast overlapping speech changes lines faster than anyone can read, and if the style needs one word at a time, the flicker is the style.
Common questions
Why does it flicker at all? One caption per word. Vizard Agent rebuilds them as sentences.
Can I keep the word highlight? Yes. Vizard Agent moves it inside a line that holds.
Why not just make each caption last longer? Because overlapping one-word captions is a different fault, and the line still was not a line.