Guides ·

How to Overlay Audio Bars in DaVinci Resolve with Screen or Add

A typical use is a music upload built from songs you generated in Suno or produced yourself: a cover image or looping background on the bottom track, and moving bars on top. The MP4 files this tool exports have a solid black background on purpose. There is no alpha channel, and you do not need one. DaVinci Resolve can drop the black out with a composite mode, which is faster to set up than a key and gives cleaner edges on thin bars. This guide walks through the full process on the Edit page, from import to final render, and explains when to pick Screen and when to pick Add.

Why black instead of transparency

H.264 in an MP4 container does not carry transparency. Formats that do (ProRes 4444, some PNG-based codecs) produce much larger files and cannot be encoded by browsers today. A black background avoids the problem: in a lightening composite mode, black contributes nothing to the image underneath, so only the bars remain visible.

The bars are drawn as flat color on pure black (#000), with no gradient or glow in the background. That matters, because any dark gray in the background would slightly lift the footage below it in Screen or Add mode.

Step 1: Export the bars

Before you open Resolve, decide on a few things in the visualizer:

  • Resolution. If the bars will sit in a corner, 640×360 or 960×540 is usually enough. If they span the whole frame, export at your timeline resolution. See the guide on choosing resolution and fps for the trade-offs.
  • Frame rate. Match your Resolve timeline: 24, 30, or 60 fps. Changing the frame rate in the visualizer re-analyzes the track, so set it before you tweak the look.
  • Color. Pick a bar color that reads against your footage. White is the most flexible, because you can tint it later in Resolve (see Step 5).

Click Render video for one song, or Render all tracks as one video if your video uses a sequence of songs.

Step 2: Put the clip on a track above your footage

  1. Open your project and go to the Edit page.
  2. Import the exported MP4 into the Media Pool.
  3. Drag it onto the timeline on a video track above your footage, for example V2 if your footage is on V1. The composite mode of a clip affects how it blends with everything on tracks below it.
  4. Line it up with the audio. The MP4 contains the song as AAC audio, so you can align the waveforms of the exported audio and your music track, then mute or delete one of them.

At this point the viewer shows a black frame with bars, covering your footage completely. That is expected.

Step 3: Set the composite mode

  1. Select the visualizer clip on the timeline.
  2. Open the Inspector (top right of the Edit page).
  3. In the Video tab, find the Composite section.
  4. Open the Composite Mode dropdown and choose Screen or Add.

The black disappears and the bars sit on top of your footage.

If nothing happens, check that you selected the clip on the upper track, not the footage below it. With no clip selected, the Inspector has nothing to show.

Screen or Add: which one?

Both modes leave black areas untouched. They differ in how they treat bright areas.

Add sums the pixel values of the bars and the footage. A mid-orange bar over a bright sky becomes close to white, because the sum clips at the top of the range. Add gives a punchy, glowing look and keeps bar colors saturated over dark footage. Over bright footage it can blow out.

Screen inverts both layers, multiplies them, and inverts the result. In practice it never exceeds white and approaches it more gently. Bars over bright footage stay visible but look softer and less saturated.

A simple rule:

  • Dark footage, night scenes, or a plain dark background: Add.
  • Bright or busy footage, skies, white walls: Screen.
  • Not sure: start with Screen, then compare with Add by switching the dropdown while the playhead sits on a bright section.

In both modes, Opacity in the same Composite section scales the effect. Lowering it to 70–85% is a quick way to make the bars feel less pasted on.

Step 4: Position and size the bars

Use the Transform section in the same Video tab:

  • Zoom scales the clip. If you exported 640×360 for a 1920×1080 timeline, Resolve’s timeline settings may already scale it to fit; check the clip at 100% and adjust from there.
  • Position X / Y moves it. For a lower-third style placement, push Position Y down until the bar baseline sits just above the bottom safe area.
  • Cropping can trim empty black space, but in Screen or Add mode the black is invisible anyway, so cropping is rarely needed.

If the bars look soft after scaling up, export at a higher resolution instead of zooming in Resolve. Upscaled thin bars lose their crisp edges first.

Step 5: Tint the bars inside Resolve

If you exported white bars, you can change their color per scene without re-exporting:

  1. Go to the Color page with the visualizer clip selected.
  2. Use the Gain color wheel to push the white toward any hue. Gain multiplies pixel values, so the black background stays black: zero times anything is still zero. Avoid the Offset and Lift wheels here, because they add to dark values and will turn the background gray.

This also lets you animate color with keyframes, something the visualizer itself does not do.

Step 6: Check the edges and levels

A few things to look at before you render:

  • Bars that look gray on dark footage. The floor setting in the visualizer controls how much quiet sound shows up. If the bars barely move, raise Sensitivity or lower Floor and re-export rather than trying to brighten them in Resolve.
  • Clipping in Add mode. Turn on the Resolve video scopes (Waveform) and look for a flat line at the top where bars cross bright areas. Switch to Screen or lower Opacity if it bothers you.
  • Timing. The bars are computed from the audio inside the MP4, frame by frame, so they line up with that audio track. If you trimmed the start of the clip, trim your music the same amount.

Background ideas for music uploads

  • Square cover art. Put an enlarged, blurred copy of the art on V1 to fill the 16:9 frame, the sharp art on V2 at full frame height, and the bars on V3 (the composite mode works against everything below). Place the bars along the bottom or beside the art.
  • Looping clip. For a short seamless loop, duplicate it on V1 until it covers the song. Choose a bar color that contrasts with the loop’s brightest areas, because Screen and Add make bars less visible over bright pixels.
  • Static image with slow motion. A slight Zoom keyframe on the background (for example 100% to 105% over the whole song) keeps the frame alive without competing with the bars.

Step 7: Render

Render as usual from the Deliver page. The visualizer track has no special requirements. If you use a long playlist export, check that the clip is not accidentally set to a different frame rate in Clip Attributes; a mismatch makes Resolve drop or repeat frames and the bars will stutter slightly.

Common problems

The black background is still visible. The composite mode is set on the wrong clip, or the visualizer is on the bottom track with nothing beneath it. Move it up a track.

The bars look transparent or washed out. That is Screen behaving as designed over bright footage. Try Add, raise Opacity to 100%, or choose a more saturated bar color.

The bars stutter. Your timeline frame rate differs from the export frame rate. Re-export at the timeline rate.

The footage underneath looks slightly brighter everywhere. Something lifted the black: a color grade applied to the visualizer clip, or a node that raised Lift. Reset the grade on that clip; the background must stay at true black for Screen and Add to leave it invisible.

Open the visualizer →