Render pipeline

Five stages

When you click Approve & build (or Build video in the editor), the build runs these five steps in order. The Build progress page shows which step is running.

Stage 01 (voice)

ElevenLabs makes one voice clip per scene. Clips that were already made with the same text and voice are reused for free.

Stage 02 (captions)

Whisper listens to the new voiceover and writes the captions, so they line up exactly with the audio. It runs on your computer: on NVIDIA graphics when it can, otherwise on the processor.

Stage 03 (motion graphics)

Each motion graphic is turned into a short video clip. Graphics that haven't changed since the last build are reused.

Stage 04 (stock footage)

Downloads the picked clips from Pexels, Pixabay and Coverr (plus any cinematic shots you made), cuts each to the scene's length and adds zoom if you chose it. Often the longest step, because it depends on your internet speed.

Stage 05 (final render)

ffmpeg (the video tool that ships with VidNexus) joins every scene: b-roll with motion graphics on top, the voice, and captions burned in (if they are on). It uses your graphics card when it can. Music is mixed in at the project volume. The result is an MP4 at 1920 × 1080 (16:9) or 1080 × 1920 (9:16 Shorts). From there, publish straight to YouTube or use Export.

Graphics card or processor

VidNexus checks what your computer can do and picks the fastest way to make the video. You don't need to set anything. Settings > Storage & Compute shows what it picked, under Video encode.

The options, fastest first

NVIDIA graphics

Used when you have an NVIDIA card. The fastest option.

AMD graphics

Used when you have AMD graphics (a graphics card or graphics built into the processor). Similar speed.

Processor

Used when neither works. Works on any computer, just slower.

Render vs Full rebuild

After the first build, the main button in the editor reads Render. It makes the MP4 again from what is already made (voice, footage, motion graphics), with your edits to timing, captions or music. No new voiceover or footage, no cost. Use it after editing in the timeline.

What Render skips

• Voice generation (uses the clips you already have)

• Footage search and download (uses the clips you already have)

• Caption writing

To run everything again, click the arrow next to Render and pick Full rebuild. It runs every step again. Only scenes whose words or voice changed get a new voiceover. Picked clips and cinematic shots are kept.

Music mixing

Background music is mixed under the narration when the video is made. Turn on Auto-duck under voice and the music gets quieter while someone is speaking.

Music in the Music tab

• Your music folder: put MP3 or WAV files in it, then click Rescan in the Music tab. Your files stay on your computer.

• Volume: a slider in the Music tab. Lower is quieter. Around -18 dB sits under a voice.

• Normalize to -14 LUFS and Beat-sync cuts are switches in the same tab.

Captions

Captions are burned into the final video by default, so viewers don't have to turn them on. Many people watch on their phone with the sound off, so captions matter.

Caption styles

Pick one of 20 caption styles in the Settings tab of the editor, next to the Burn-in captions switch. The styles differ in:

• Font family, size and weight

• Fill color, outline and shadow

• Highlight color for the word being spoken

• Position on screen

• How many words show at once

Want to upload captions to YouTube separately instead? Use Export > Subtitles (SRT).

Where the output lives

The finished video is in %APPDATA%\VidNexus\renders. The working files (voice, footage, motion graphics, captions, music) are in %APPDATA%\VidNexus\assets. You can move both in Settings > Storage & Compute, under Working files folder and Finished videos folder.

Working files take the most space, mostly the footage. The Complete & clean button on a finished project deletes the source files and keeps the final MP4. It's worth doing on old projects to free up disk space.

What's next

Troubleshooting: Render errors and their fixes.

Motion graphics: The overlays added to the video at stage 03.