How to edit a talking-head video into a 4K YouTube master and shorts
Upload the take and tell Vizard Agent what must be preserved. Vizard Agent cleans the speech from the transcript, builds a transparent logo from your file, tests the caption typography for your script before rendering, and delivers a 4K master, vertical shorts and thumbnail concepts from the same edit.
What do you type into Vizard Agent?
List your constraints explicitly in the instruction. Vizard Agent treats a line like "keep the original 4K, 30fps, colour and processed audio" as a hard limit on every stage of the build, which is what stops a pipeline quietly normalising footage you already graded and mixed. Then name every deliverable you need.
Prompt
What does Vizard Agent actually do?
A finished YouTube upload is a set, not one file: the full-resolution master, the vertical clips that feed it and the thumbnails that get it opened. All three come out of the same edit when that edit is built at full resolution from the start, so nothing has to be upscaled at the end. In the session behind this article it:
- Transcribed the speech, extracted word timestamps and verified their length against the take, then designed the edit points for clean speech from them.
- Built a transparent logo from the user's file through five passes (cropping, refining the matte, optimising the alpha, cleaning isolated specks), checking each result.
- Downloaded stock b-roll and built a map graphic template.
- Downloaded typefaces for the language, installed the text-shaping libraries and tested three fonts on a rendered frame, then tested karaoke highlighting.
- Rendered the 4K master at 3840x2160, 30fps and 205.0 seconds, and re-laid the infographic so it never overlapped the speaker's face.
- Rendered five vertical shorts, three thumbnail concepts and a selectable second subtitle track.
When does this not work well?
Working at full resolution throughout is slower and stricter than working at a proxy size, because every overlay is composited at 4K. Unusual scripts are still the risk area for caption fonts. Preserving the audio means preserving its flaws, and cutting out every stumble can make a delivery feel clipped. The thumbnails are concepts, not a finished design system.
Common questions
Will Vizard Agent keep my 4K? Yes. Vizard Agent builds every element at full resolution rather than upscaling anything at the end.
Can Vizard Agent make the shorts too? Yes. Vizard Agent cut five on this run from the same master edit.
Will overlays cover my face? Vizard Agent checks the rendered frames and re-lays anything that does.