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In OBS, select the playlist source and choose Transform → Fit to Screen—not Stretch to Screen. Fit preserves the 4:3 picture, leaving side bars on a 16:9 canvas instead of warping the image.

Fit the 4:3 playlist source to the OBS canvas

  1. In OBS, select the playlist source in the Sources dock.
  2. Open its context menu and choose Transform → Fit to Screen. The OBS Sources Guide lists Ctrl+F on Windows and Cmd+F on macOS for this command. See the OBS Sources Guide.
  3. Check the preview. The complete 4:3 frame should be visible, with unused space at the sides of a 16:9 canvas.
  4. Keep the side bars, or use a background, image, or other scene element in the surrounding space. OBS’s Aspect Ratio Guide discusses using other content to fill black space.

For a Media Source playlist, OBS documents playlist support when VLC Media Player is installed. If your playlist mixes resolutions or aspect ratios, inspect the preview after each item changes: the reviewed OBS documentation does not specify how differently sized playlist items are framed at transitions.

Why Fit to Screen prevents distortion

A 4:3 picture is proportionally narrower than a 16:9 canvas. Fitting the entire frame into that wider space preserves its shape, so the unused area appears on the left and right. OBS’s Aspect Ratio Guide, published November 27, 2021, illustrates 4:3 using 640×480 pixels and notes that 16:9 is common on computer displays and generally expected by platforms such as YouTube.

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  • Fit to Screen: preserves the source proportions and keeps the full frame visible; side bars or other surrounding content remain.
  • Stretch to Screen: fills the canvas by changing the image proportions. OBS says stretching warps and distorts the source and is generally not recommended.
  • Scale up or crop: can cover more of the canvas, but some of the source image will fall outside the visible area.
  • Background or overlay: keeps the full 4:3 image intact while using the remaining canvas space for other scene content.

Canvas resolution is not the fix for a stretched source

OBS’s Studio Overview Guide, published August 25, 2021, distinguishes the Base (Canvas) Resolution, where sources are arranged, from the Output (Scaled) Resolution, sent to the stream or recording. Changing output resolution does not correct a source that has already been stretched in the scene. Changing the base canvas can require repositioning or resizing sources, so use the source’s Fit to Screen transform for this problem.

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OBS also has a Scaling/Aspect Ratio filter for deliberate source-level changes to scaling or aspect ratio. It is not needed for the ordinary case: preserving a 4:3 source within a wider canvas.

Troubleshooting a playlist that still looks wrong

  • The picture still fills the whole canvas: confirm you selected the playlist source and applied Fit to Screen, rather than Stretch to Screen.
  • The video is no longer distorted but the sides are empty: that is expected when a complete 4:3 frame is fitted to a 16:9 canvas. Leave the bars or place scene content behind or around the source.
  • Part of the image is missing: the source may be enlarged or cropped. Reapply Fit to Screen if keeping the entire frame matters.
  • Framing changes when the playlist advances: check the next item in the OBS preview. Mixed dimensions and aspect ratios may need inspection in your actual OBS/VLC setup; the cited OBS guidance does not establish how every transition behaves.
  • The playlist is not available in the Media Source: OBS’s documented playlist support for Media Source requires VLC Media Player to be installed.

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