If videos in an OBS playlist appear at different sizes, add the Scaling/Aspect Ratio filter to the source that plays the playlist and set a common resolution for your composition. For an OBS VLC playlist, attach the filter to the VLC Video source; then check what happens to clips with different aspect ratios before you go live.
This can address the small-video-in-the-top-left-with-black-space symptom, but it is not a guaranteed fix for every file or OBS setup. You still need to choose whether to preserve the full image with bars, crop some of it, or distort it to fill the frame.
Identify the mixed-resolution symptom
A playlist can contain files with different pixel dimensions: for example, one clip may be 1920×1080 while another is 1280×720. Those dimensions are different, but both clips have the same 16:9 shape. Other playlists mix shapes as well, such as a 16:9 landscape clip and a 4:3 or portrait clip. The distinction matters: a common size can address inconsistent source dimensions, while a different shape also creates a framing decision.
You may notice that one item fills the preview while a later, smaller item sits in the top-left corner, leaving a large black area around it. Or the playlist may change size from one item to the next. These are useful observations, not a diagnosis by themselves. First establish which OBS source is actually playing the playlist, and whether the problem is the source’s size in the scene or an unrelated playback fault.
If you are building a playlist from local files, OBS documents VLC Video as the source type for a playlist. It requires VLC to be installed; the OBS media-sources guide says to install the 64-bit VLC version when using 64-bit OBS. OBS’s built-in Media Source is intended for an individual media file rather than a playlist. Check the OBS media sources guide if you are unsure which source you added.
Make a note of the clips that show the issue and their dimensions and aspect ratios. You do not need to make every file the same size before trying a source filter. But knowing whether the clips are merely different resolutions or have different shapes helps you choose a sensible result and test it properly.
If the clip looks correctly framed in the OBS preview but appears different on YouTube, check the complete output path too. A source filter changes how that source is presented in OBS; it does not establish what YouTube will show in every viewing context. Check the stream preview and a short test broadcast where practical, rather than assuming that the project canvas alone is the whole picture.
Add the Scaling/Aspect Ratio filter
In OBS, find the source that renders the playlist in the Sources list. Right-click it and choose Filters. OBS describes filters as effects attached to a source or scene, so a filter on an unrelated camera, image, or scene source will not normalise the playlist item. The OBS Studio overview explains how to open filters from a source or scene.
In the source’s filters window, add the built-in Scaling/Aspect Ratio filter. In its Resolution property, enter the common dimensions or aspect ratio you want that source to use in the composition. OBS’s Scaling/Aspect Ratio filter documentation describes this property as setting the source’s new resolution or aspect ratio.
For a 16:9 composition, 1920×1080 and 1280×720 are examples of matching dimensions. Pick the one that fits your intended scene and output; they describe the same shape at different pixel sizes. A smaller source target does not create detail that was absent from the original file, and choosing a larger number does not make a low-resolution clip sharper.
The filter’s job here is to apply a consistent source-level sizing rule to the playlist output. It does not turn every original into the same master file, repair a damaged video, or guarantee identical behaviour across every codec and version. The reported fix for this particular corner-placement symptom comes from an individual community discussion, not an official promise of universal results. Treat the filter as a sensible first test, then verify it on your own playlist.
Apply it to the playlist source
Attach the filter to the source that contains the playlist, not to the whole scene unless you deliberately want the effect applied to everything in that scene. If you use VLC Video, select that source before opening Filters. This is particularly important when the Sources list contains similarly named items or several layers that look like the same video in the preview.
After adding the filter and setting Resolution, play the playlist in OBS and observe a transition to another entry. Confirm that the filter remains attached to the playlist source and that the next clip is affected. A filter set on a separate source will not follow a playlist just because it is visually underneath or nearby in the scene.
If the setting appears to have no effect, confirm the source type and where you attached the filter. Check that VLC is installed in the architecture matching OBS, and confirm that the playlist itself is advancing. Then test a representative file directly if you can. OBS’s documentation explains the filter’s capability, but does not guarantee that every media file, codec, and version will behave in exactly the same way.
For an always-on channel, this is a good place to test the files that matter most rather than relying on the first item. For example, check the opening devotional video, a later bhajan with a different size, and any portrait announcement or sponsor card. A playlist that looks right during setup can still reveal its oddest dimensions hours later.
If a mismatch in the OBS preview persists after the filter is correctly attached, do not keep changing global settings at random. Confirm the dimensions and shape of the file, inspect the source’s filter settings, and test whether the same problem occurs with a different item. If it does not, the issue may be specific to that file or playback path, rather than the whole playlist.
Choose fit, fill, or stretch deliberately
When source and frame have different aspect ratios, no sizing choice can show the complete image, fill every part of the frame, and preserve proportions all at once. You need to decide which of those properties matters most for the clip. The OBS aspect ratio guide explains the consequences of these approaches.
| Choice | Image geometry | What you see in a 16:9 frame | Best suited to |
|---|---|---|---|
| Fit, preserving aspect ratio | Preserves proportions and the whole image | Bars or unused space may remain where shapes differ | Text, artwork, a full devotional image, or anything whose edges matter |
| Fill by cropping | Preserves proportions, but cuts off part of the image | The frame is filled, but content at the edges may be lost | Footage where the centre is the subject and edge loss is acceptable |
| Stretch | Changes the image’s proportions | The frame is filled, but people and objects may look wider or taller | Rare cases where distortion is acceptable or the source was wrongly interpreted |
“Fit” and “fill” are useful ways to think about the desired result, not a promise that one filter setting will intelligently frame every playlist entry. With fit, black bars or empty canvas are an honest consequence of preserving the whole image when its shape differs from the frame. With fill, cropping is the cost of using the full frame without changing proportions. Check exactly which part of the image will be cut off before settling on it.
Stretching avoids bars and cropping by changing proportions, but that can make a circular logo look oval or a person look wider. OBS says stretching is rarely advisable in its aspect-ratio guidance. If a file seems stretched unexpectedly, compare it with the original before accepting that appearance as the right output.
A single playlist source-level choice may not be ideal for every entry. For a mixed devotional playlist, fit can keep captions and artwork visible, even if one portrait item leaves side bars. For a local-news loop, cropping a 4:3 clip might cut off a ticker or a speaker’s face. Review the content near the edges, not only whether the black space has disappeared.
Check the result against the output frame
A source’s resolution, the OBS canvas and the stream’s output resolution have different jobs. The Base (Canvas) Resolution is the working space in which you arrange sources. Output (Scaled) Resolution sets the dimensions used for the stream or recording. The Scaling/Aspect Ratio filter, by contrast, applies to the selected source. Changing output resolution does not replace a source-level fix for a playlist item that occupies an inconsistent part of the composition.
For a YouTube layout, 16:9 is a common target; OBS’s aspect-ratio guide gives 1920×1080, 1280×720 and 3840×2160 as examples of that shape. Choose the canvas and output your production can support and that suit the rest of your scene. If you change the base canvas, you may need to reposition or resize other sources. Changing output resolution has a different effect and does not itself move sources around the canvas.
Check the playlist against the frame at the same scale and position you intend to use live. Inspect a large file and a small one, then include at least one clip whose aspect ratio differs from the target if your playlist has one. Look at the edges for cropped captions, logos or faces; look at circles and people for distortion; and note any bars you are choosing to retain. A preview that shows only the middle of a clip is not enough to judge those trade-offs.
Do not mistake choppy playback or encoder overload for a sizing problem. If the clip occupies the right part of the canvas but stutters, that is a separate performance issue. OBS recommends lowering output resolution or frame rate as potential ways to reduce resource use, while noting that lowering the base canvas can complicate scene management. See its encoding performance troubleshooting guide rather than treating a resolution filter as a performance fix.
Before you leave a playlist running overnight, let it advance through the combinations most likely to expose a problem. Confirm that each item appears in the intended frame, the audio continues, and the transition does not reveal a scene layer or leftover image. For other long-running channel checks, our guide to keeping audio playing on a 24/7 YouTube stream covers another issue that is easy to miss in a short preview.
Keep source scaling separate from channel operations
The scaling filter is a local composition fix, not a substitute for preparing the playlist or operating the broadcast. Keep source files labelled with their dimensions or contents if you often swap clips; that makes it easier to find an outlier when the preview changes. If a particular video repeatedly needs a different crop, consider whether it belongs in a separate scene or needs an edited version that you have checked before broadcast.
For a channel that also uses a recurring stream key, separate that setup from the visual diagnosis. The guide to reusing a YouTube stream key for a 24/7 channel explains the channel-side topic; changing a key will not correct a playlist item’s size in the OBS canvas. Keep each troubleshooting step tied to the symptom it can address.
If you need OBS itself to remain open and playing the playlist continuously, also consider how your computer and connection will behave when unattended. A low-power mini PC for a 24/7 YouTube stream is relevant when comparing a local always-on setup. StreamNeo removes the need to leave your own computer running for an uploaded-file 24/7 YouTube stream, which is useful when avoiding an overnight local playback session is the specific concern; it does not make a mismatched source image correct, so resolve and check the framing first.
A local OBS playlist remains useful when you need live scene control, want to mix changing sources, or depend on software and devices in your own setup. An uploaded-file workflow serves a different need: a prepared video running continuously without your computer on. Decide based on what the channel actually needs, not on the assumption that one workflow fixes every failure mode.
When you have chosen the frame and tested the representative clips, keep a note of the filter setting and the files that need special attention. That makes later playlist edits easier to verify and gives anyone helping with the channel a practical starting point. It is more useful than assuming that every new file will behave like the first one.
Before committing, compare the operating options on the pricing page. When the file and channel are ready, start free — 24-hour trial, no card.
FAQ
Does the Scaling/Aspect Ratio filter work on every OBS playlist?
OBS documents the filter’s ability to set a source’s resolution or aspect ratio, but it does not promise a universal result for every playlist item, media file or version. Attach it to the source rendering the playlist, then test representative clips. If it does not affect later items, check the source and installed OBS/VLC setup before assuming the filter is broken.
Should I change the canvas or output resolution instead?
Not as the first response to one small playlist item in the corner. The canvas is the space for arranging sources, output resolution sets stream or recording dimensions, and the filter adjusts the selected source. Changing canvas or output settings can affect other parts of your scene without resolving a source-specific mismatch.
Can I fill a 16:9 frame without bars or distortion?
Only if you accept cropping when the source has a different shape. Preserving the full image can leave bars; filling by cropping can remove edges; stretching fills the frame by changing proportions. Check the whole clip and choose the trade-off that suits its content.
Is a VLC Video source required for a playlist?
For an OBS playlist made from local files, the documented VLC Video source supports playlists and requires VLC to be installed. OBS’s Media Source is for an individual media file. Check OBS’s current media-sources guide and make sure VLC’s architecture matches OBS before troubleshooting the filter.