A recorded regional video does not have a standard aspect ratio just because of where it was made or what it depicts. Check the actual file dimensions, then set OBS’s canvas for the composition you want and its output resolution for the stream you intend to send to YouTube Live.
The canvas and output are separate controls: the canvas is where you arrange sources, while output resolution is the size OBS sends to the stream. Preserve the source’s proportions; decide whether to show the whole image with space around it or crop some edges to fill the frame.
Check the video’s actual dimensions
Start with the file, not a guess based on its language, region, or subject. A Malayalam song clip, a temple recording, a local news segment and a phone-shot interview might each use different dimensions. Even files from the same creator may have been recorded or exported in different orientations.
Find the video’s width and height in your media player’s file information or in the file properties available on your computer. The ratio is width compared with height: a 1920×1080 file is landscape 16:9, while a file that is taller than it is wide is portrait. Other dimensions can have other ratios; classify the source from what the file reports rather than treating 16:9 or 9:16 as universal.
If the source is a clip already inside an editing project, check the exported file you will actually add to OBS. The project preview, the original camera recording and the export can differ. Likewise, a video that looks portrait when viewed on a phone may include borders or have been exported in a wider frame. The dimensions of the playable file are what matter when you compose the stream.
Make a note of three things before changing OBS: the source’s orientation and dimensions, whether all edges need to remain visible, and the intended presentation on YouTube. A full-frame devotional recording may need its captions or lamp-lit altar kept intact. A news loop may have a ticker near the bottom edge that should not be cropped. A portrait clip may leave substantial unused canvas in a landscape scene unless you design around it.
Open OBS Settings > Video
In OBS Studio, open Settings > Video. The Video page has controls for Base (Canvas) Resolution and Output (Scaled) Resolution. They are related, but they do different jobs. OBS explains its interface and scene concepts in its Studio overview, and its Aspect Ratio Guide discusses matching source and canvas proportions.
The first field describes the working area in which your scene sources are arranged. The second describes the resolution of the resulting stream or recording. It is possible to use different dimensions for them, but doing so should be a deliberate choice. A smaller output than canvas may reduce the size of what is sent; it does not automatically correct a source that is wrongly placed or distorted on the canvas.
Before changing either value, take note of the current scene layout. OBS may ask you to confirm a change, and existing sources can end up positioned or scaled in ways you did not expect after the canvas changes. If this is a channel already in use, it is sensible to test a copy of the scene or record a short local preview first rather than altering a working layout immediately before a scheduled stream.
If you are still setting up the stream key and encoder connection, keep that work separate from the aspect-ratio decision. The OBS YouTube stream-key settings guide covers the connection side; here the important task is to make sure the picture is composed correctly before it reaches YouTube.
Set Base (Canvas) Resolution for the composition
Choose a base canvas that suits the scene you are building, not simply the resolution you hope to send. For a conventional landscape YouTube presentation, 16:9 is a sensible starting composition. OBS’s guide gives 1920×1080 and 1280×720 as examples of 16:9 resolutions. Those are examples, not a requirement for every file or every use of YouTube Live.
The canvas is like a board on which you place the video, titles, logos, and any other sources. If the video is portrait and the canvas is landscape, there is room to place the portrait image with a background, title panel or other material beside it. If the canvas is portrait, a landscape clip may need empty space above and below, a crop, or a designed background. There is no single correct choice until you decide what should be visible and how the viewer should see it.
A useful way to choose is to begin with the intended viewing experience. If you want a familiar wide presentation for a television or desktop viewer, compose in landscape and decide how to use any side space around portrait material. If the channel’s scheduled presentation is vertical, a portrait composition may be more appropriate, but confirm how that stream is configured in YouTube’s current Live Control Room. Do not assume the file’s orientation alone determines the platform’s presentation.
If you switch an existing scene from landscape to portrait or the other way around, expect to reposition sources. A title placed at the top of a wide canvas may overlap a portrait video after a canvas change. Logos and lower thirds can end up beyond a narrow frame. The next step is not to keep pressing scale buttons until the preview looks full; it is to reassess the composition with the new canvas boundaries in view.
Set Output (Scaled) Resolution for the stream
Set the output resolution to a size that matches the composition you have made and the stream you mean to deliver. If the canvas and output use the same aspect ratio, the image can be scaled in size without changing its shape. If their ratios differ, the output process must fit, crop, or distort the composition somehow; avoid relying on an unexplained mismatch to repair a poor layout.
For a landscape 16:9 stream, OBS’s examples of 1920×1080 and 1280×720 can help you think about size while preserving the same shape. Use the one appropriate to your stream workflow and test it. Do not treat these example resolutions as a promise of quality or as YouTube’s sole accepted choices. YouTube’s resolution and aspect-ratio guidance for computer playback says the standard computer aspect ratio is 16:9 and explains that the player adapts to different video shapes.
The practical comparison is about the picture you want, not just two numbers in a settings panel:
| Choice | What it helps preserve | Trade-off to consider |
|---|---|---|
| Match canvas and output ratios | The intended scene shape from composition through output | You still need to place and scale each source correctly |
| Use a smaller output at the same ratio | The same overall framing at a smaller output size | Fine detail may be less apparent; test the result at the intended viewing size |
| Fit a mismatched source within the canvas | The full recorded frame and its edges | Unused space remains and needs a considered background or layout |
| Crop a mismatched source to fill | A frame that fills the chosen canvas | Some content at the edges is lost, potentially including captions or people |
| Stretch a source to fill | No unused space at the edge | Circles, faces and lettering can look visibly warped |
These are composition choices rather than universal presets. If you have a portrait bhajan performance and a landscape canvas, fitting it can preserve the singer and the harmonium while leaving space for a title or a softly designed background. Cropping might cut off a performer or a shrine detail. Stretching may make a familiar face look unnaturally wide. In most cases, one of the first two deliberate options is preferable to distorting the source.
Re-align sources after changing the canvas
After choosing the base canvas, return to the scene and inspect the source in the preview. Select the recorded video and use its transform controls to position and size it. OBS’s aspect-ratio guidance describes fitting, cropping and the risk of stretching. You can use the source’s transform options for a fit or fill operation, then adjust its placement to suit the scene.
To show the complete source, scale it to fit inside the canvas while retaining its proportions. There may be space on one or more sides. That space is not automatically a mistake: use a background colour or image, a title, or another intentional element. For a loop of regional news clips, for example, the full frame might matter because a location label or ticker sits close to an edge. Keeping that visible can be more useful than filling every pixel of the canvas.
To fill the canvas, scale the source until it covers the frame and crop the overflow only if losing the edges is acceptable. OBS allows cropping with the source’s bounding box; holding Alt while dragging an edge crops it. You can also use Edit Transform for more precise values. Check all sides after cropping, especially subtitles and embedded graphics. What looks like a harmless trim in a preview may remove a name, a phone number or part of a performer.
Do not drag the source unevenly in one direction just to eliminate bars. That changes the proportions and can distort people, instruments, text and circular logos. If you need a filled frame but cannot crop the subject, build a background or side panels. A practical layout might place a portrait video in the centre with a title and a subdued background filling the sides, rather than enlarging it until important material disappears.
Changing the canvas can also affect elements other than the video. Check titles, logos, overlays, webcam sources and any browser-based graphics. A source that was pinned close to the right edge of a landscape canvas may be partly outside a portrait canvas. Reposition each item, then preview the scene from beginning to end of a sample clip. If the video changes framing within the file, a crop that works at the opening may fail later.
Choose portrait or landscape for the YouTube presentation
Choose orientation for the intended presentation and the material, rather than assuming all YouTube Live streams need one shape. For a conventional wide presentation, landscape 16:9 gives viewers a familiar frame on computer playback. YouTube’s player adapts to other video shapes, but the way the stream is presented still depends on the stream setup and the viewer’s device. A portrait clip can be shown whole within a landscape frame; that does not mean the underlying file has become landscape.
YouTube documents a workflow for horizontal and vertical live presentations. Its Help page on dual-stream setup describes vertical presentation options, including a centre crop by default and layout choices. Those are YouTube-side controls in addition to your OBS scene. Check the current options for the scheduled stream in Live Control Room and verify what your encoder is expected to send; do not assume every account, stream or encoder has identical controls.
A centre crop is only useful if the important part of the picture remains in the centre. If a regional event recording places speakers at the sides, a vertical crop may omit them. If a portrait song video places the singer centrally, it may survive a centre crop, but titles near the top or captions near the bottom still need checking. Preview the actual planned layout, not just the OBS canvas, before relying on a dual presentation.
For a channel made from multiple recorded clips, decide whether consistency matters more than showing every clip edge-to-edge. You might retain one landscape scene and fit portrait clips into it, or create a separate portrait-oriented scene for a vertical presentation. If clips vary, a playlist can make the schedule easier to manage, but it does not standardise their shape; the playlist workflow for multiple property-tour videos illustrates the separate question of sequencing videos in a live stream.
The same point applies to music and devotional channels. A 24/7 Malayalam songs stream guide may be relevant to the type of content you are planning, but the clips themselves still need inspection. A file of a performance filmed on a phone, an old television recording and a newly edited lyric video may all have different frames. Treat each as a source to compose, not as evidence for a channel-wide ratio.
Preview and test before the scheduled stream
Before going live, run the scene with the actual file and watch the preview for more than its opening frame. Check that the full source is visible where intended, the crop stays acceptable as the clip changes, and titles remain inside the canvas. Listen as well as look: a successful picture layout does not confirm that the sound is present or in sync.
YouTube’s live-streaming troubleshooting guidance recommends using the Live Control Room preview and monitoring the stream. Treat that as a final check rather than a substitute for designing the scene in OBS. A short test also reveals practical problems such as a file that starts on a blank frame, an overlay that covers a face, or black bars that were baked into the video during export.
For a channel intended to run while you are away from the computer, the picture decision remains yours even if the broadcast itself is handled elsewhere. StreamNeo turns an uploaded video into a YouTube live stream, which removes the specific need to keep OBS open on your computer for that file, but it does not decide whether a crop suits your content or whether you have permission to rebroadcast it. Check the video’s rights and review the planned YouTube presentation before scheduling it.
If OBS is the right fit for your setup, keep a record of the chosen canvas, output resolution and source transform for each scene. That makes later changes easier to diagnose: you can tell whether a clip changed dimensions, the scene canvas changed, or only the output size changed. For each new file, re-check rather than assuming an older scene will preserve every edge.
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FAQ
Does a regional video always need a particular OBS aspect ratio?
No. “Regional” describes the video’s subject, origin or audience, not its dimensions. Inspect the actual file and choose the canvas for the intended YouTube presentation.
What is the difference between Base (Canvas) and Output (Scaled) Resolution?
Base (Canvas) Resolution is the composition area where you arrange scene sources. Output (Scaled) Resolution is the size OBS sends to the stream or recording, so changing one does not automatically fix source framing in the other.
Should I fit a portrait video or crop it to fill a landscape canvas?
Fit it if every edge matters, then use the remaining canvas space for a background or other scene elements. Crop only when losing the edges is acceptable; do not stretch the source to remove empty space.
Does setting a portrait canvas in OBS create a vertical YouTube Live stream?
It sets the shape of your OBS composition, but the planned YouTube Live presentation may have its own layout controls. Check the current Live Control Room options for your scheduled stream and preview how the final presentation crops or displays the source.