To build a YouTube Live loop from videos with mismatched resolutions, set one consistent output frame, then decide how each source should fit inside it. OBS can arrange a playlist and handle framing graphically; a fixed FFmpeg workflow may suit command-line automation, but neither tool is a universal performance winner.
The important distinction is between the dimensions of your source files and the dimensions of the stream you send to YouTube. YouTube makes playback formats from the stream it receives; it does not correct inconsistent composition for you. Make the framing decision before the broadcast, and test the result with the actual clips.
What matters on a low-power PC
A low-power computer has several jobs during a live loop: read and decode video, place it into a composed frame, encode that frame, and send it over the network. The load depends on the material, output settings, encoder and computer, so a claim that OBS or FFmpeg always uses less CPU would be misleading. Treat a short test on your own setup as evidence; an unverified benchmark from a different machine is not.
Mixed resolution is manageable if you give the production a stable target. A 1280×720 clip and a 1920×1080 clip can both be placed in a 1920×1080 canvas, for example, but the smaller source cannot gain detail merely because the output is larger. If you scale it up, it may look softer. Conversely, a larger source may be reduced. The aim is consistent presentation, not manufacturing detail that is not in the files.
Do not confuse pixel dimensions with aspect ratio. Two clips can have different resolutions but both be widescreen; another file could be a square or portrait image. Decide whether viewers should see the full image, whether bars are acceptable, or whether the edges can be cropped. These are editorial choices, not just technical settings.
For devotional music, a small crop may remove a border but cut off a deity or text. A local news loop may need all lower-third captions visible. A study channel might prefer bars to cropping a lecture slide. Make a list of what must remain in frame before selecting a transform.
If the PC struggles, simplify one variable at a time. Begin with a modest output resolution and frame rate that suit the material, then test the encoder and stream. Avoid stacking filters, animated overlays and unnecessary scene changes until a plain loop works. The internal FFmpeg boot-start guide is relevant if you later need a command-line stream to launch with the computer, but startup automation is a separate concern from handling mixed input dimensions.
Set one output frame and choose the playlist
In OBS, open Settings → Video and choose the Base (Canvas) Resolution and Output (Scaled) Resolution. The canvas is the working space in which you position sources. The output setting determines the encoded stream dimensions. You may use the same values for both, or compose at one size and scale the output to another; the right choice depends on your intended quality and what the PC and upload connection can sustain. The OBS overview guide explains the distinction.
A common widescreen target is 1920×1080, but it is an example, not a requirement. A lower output may be more practical for an older computer, a constrained connection or source material that is already low resolution. Choose one target and keep it fixed for the loop rather than trying to switch output dimensions every time a new file starts.
For a sequence of local videos, add a VLC Video source and select the files in the intended order. OBS documents this source as playlist-capable, with controls for Loop Playlist and Shuffle Playlist. Turn shuffle off when order matters, and enable loop when you want the playlist to repeat. VLC must be installed, and OBS notes that 64-bit OBS requires 64-bit VLC. If your entire broadcast is one repeating file, an ordinary Media Source has its own Loop setting. See the OBS Media Sources guide for the available source behaviour.
The playlist handles what plays next; it does not make different aspect ratios look alike. Test the framing on every item, not only the first. A transformation suitable for a 16:9 bhajan video may cut off the sides of a portrait clip or make a title card appear oddly stretched.
Before setting the loop live, check that the end of one file and the start of the next are acceptable. A brief black interval, an abrupt change in loudness or a title card held longer than expected can all be more noticeable when a channel runs continuously. Review a complete pass through the playlist if it is short, or at least inspect every transition if it is long.
OBS workflow and performance factors
OBS is useful when you want to see the production layout and adjust it without writing a command. You can build a scene, add the playlist source, position it on the canvas and inspect the result in the preview. If you have a logo, clock or text overlay, you can layer it visually and make a change without rebuilding a command line. That convenience can matter more than a theoretical difference in CPU use.
For each clip, choose a transform deliberately. Fit to Screen preserves the full picture and its proportions. When the source and canvas have different shapes, empty bars may remain. Crop to fill occupies the frame but removes part of the image. Stretch to Screen fills the space while distorting the source; circles can become ovals and faces can look wider. OBS's sources guide and aspect ratio guide explain transforms and why stretching changes geometry.
| Framing choice | What remains visible | What may be sacrificed | Typical use |
|---|---|---|---|
| Fit to Screen | The whole source, with proportions intact | A fully filled frame; bars can appear | Slides, captions, artwork or anything where edges matter |
| Crop to fill | A filled frame, with proportions intact | Some of the source edges | Footage where the central subject is safe from cropping |
| Stretch to Screen | The whole source and a filled frame | Correct geometry | Usually avoid when the image contains people, text or familiar shapes |
Treat that table as a decision aid, not a setting to apply blindly. Crop a representative frame from each source and inspect its edges. For a sequence with mixed dimensions, apply a consistent rule where possible, but use a different crop on a particular clip if its content requires it. Consistency means viewers understand the presentation; it need not mean forcing every source into an identical transform at the expense of important information.
Performance is affected by more than the software name. Output size, frame rate, codec, encoder choice, filters, overlays, source decoding and concurrent work on the PC all influence the workload. A modest, clean scene gives you a useful baseline. If the machine is also running a browser with many tabs, file conversions or other applications, close what the broadcast does not need before concluding that the streaming workflow itself is too demanding.
OBS's graphical preview can make composition easier to inspect, but it is also another part of the production environment. Check OBS's own statistics and YouTube's stream health rather than judging only by the preview on your computer. A smooth local preview does not prove that the outgoing connection is stable or that the viewer receives a clean stream.
Where a fixed FFmpeg workflow may fit
FFmpeg may suit a workflow that is already defined in commands and needs to be reproduced in a predictable way. If you are comfortable maintaining a command, managing file paths and checking logs, it can be a compact way to automate a fixed production. It is less convenient if you want to drag sources around, compare crops visually or change overlays while watching a scene preview.
That is a workflow distinction, not a performance ranking. There is no universal rule that FFmpeg uses less CPU than OBS for a given loop. The actual result depends on how the stream is configured and the machine running it. Do not select a tool based on an unsourced comparison or a test that used different video, output settings or hardware. A test on your own PC, with your own files and intended settings, is more relevant.
A fixed command can also make visual adjustments less immediate. If the first clip is landscape and the next is portrait, you need to know what your command does to both. Review the output, including text and image edges, before treating a configuration as ready for a long broadcast. If you change source files or output settings later, test again rather than assuming the old result still applies.
The guide to switching a YouTube loop from a cloud service to FFmpeg on a VPS covers a different operational change, but the underlying choice is similar: decide whether you want to manage a fixed command-based setup yourself. If a local PC is the intended host, remember that it must remain available, connected and able to run the stream for the duration you need. The article on moving an Aarti stream from a local PC to a VPS is useful when the question becomes where the loop should run, rather than how to frame its files.
If you are not comfortable troubleshooting a command when a file path changes or the process stops, a graphical setup may be easier to operate. If your production is stable and you already maintain command-line jobs, FFmpeg may fit better. Neither choice removes the need to test the picture, connection and audio.
Check for a supported hardware encoder
Before lowering quality or replacing a tool, check whether your computer offers a hardware encoder supported by OBS or the FFmpeg build you use. Hardware encoding can shift some encoding work away from the general CPU, but support varies by graphics hardware, drivers, software and codec. Do not assume that the presence of a graphics card means the desired encoder is available or that it will automatically solve every performance issue.
In OBS, inspect the available encoder choices in the output settings. Pick an option that is actually listed and supported on that machine, then make a test broadcast or recording using the intended resolution, frame rate and codec. If the picture has glitches, the stream health warning rises, or the system becomes unstable, compare with another available encoder or a lower output setting. Keep notes about which setting you tried so you can identify what changed.
A dedicated hardware encoder may be useful for a more elaborate production, but it is not a requirement for a local video playlist loop. For a simple loop, first see what the existing computer can do with a restrained output and a clean scene. Buying equipment before checking the supported options on hand may add cost without fixing a network problem, bad framing or a source that itself is difficult to decode.
The encoder setting is only one part of the YouTube configuration. YouTube's current general guidance lists supported ingest protocols and codecs, recommends CBR and a two-second keyframe frequency, and says not to exceed four seconds for keyframes. Check YouTube's live encoder settings and bitrate guidance for the current choices, then select settings appropriate to your output. The settings are guidance, not a guarantee that every PC or connection will sustain them.
Try a modest output and monitor stream health
Start with an output that your computer and upload connection can plausibly maintain. YouTube's H.264 guidance lists 10 Mbps for 1080p at 30 fps and 12 Mbps for 1080p at 60 fps; those are codec- and frame-rate-specific configuration values, not a performance benchmark. Check the current table before publishing, and do not assume that a 1080p stream is the right target if the source, PC or connection points to a more modest choice.
The bitrate must fit the upload capacity with room to spare. YouTube's streaming tips recommend leaving 20% of upload bandwidth available beyond the stream bitrate, and you should account for a backup stream if you use one. This is particularly relevant where household or shop connections are shared. A speed test at an otherwise quiet time is not proof that the connection will remain clear during an evening broadcast. The YouTube streaming tips describe network headroom and recommend testing before going live.
Use a private or unlisted test in Live Control Room before making a public broadcast. Include representative moving footage, not just a still image or title card. A mostly static devotional image may be easy to encode, while a clip with rapid movement, film grain or detailed water can make the same output settings work harder. Test audio as well: listen for gaps at clip boundaries, unexpectedly quiet files, clipping and an audio track that continues after the picture changes.
When the stream begins, look at OBS statistics and the YouTube Live Control Room's stream health messages. Watch for dropped frames, unstable bitrate or warnings, and check that the picture and audio reaching YouTube match what you expected. YouTube recommends monitoring quality during the stream; its live stream settings help page is worth checking alongside the encoder guidance. A good local preview alone is not enough evidence that the ingest is healthy.
If you see a problem, change one setting at a time. First distinguish between dropped frames caused by rendering or encoding and a connection warning. Then try a lower output resolution or frame rate, reduce unnecessary filters, or test another supported encoder. If the connection is the issue, a lower bitrate may help; changing how a clip is cropped will not repair an unstable upload. For an India-based channel seeing variable fibre performance, the stream-health checklist for unstable bitrate on Indian fibre can help separate network symptoms from production settings.
Keep a short record of the settings that gave a clean test: output resolution, frame rate, encoder, bitrate, playlist order and framing choices. If you replace a video, repeat the visual check, particularly for aspect ratio and audio. A dependable loop is a maintained workflow, not a one-time settings screen.
Choose based on setup and operating needs
Choose OBS if a graphical preview and visible scene arrangement will make the loop easier for you to build and maintain. It is a practical fit when you need to inspect framing, add a logo or text, or reorder a playlist without editing a command. The trade-off is that the PC must stay on and the configured production must keep running; you also need to check the system and stream health rather than assuming a successful start means a sound overnight broadcast.
Choose a fixed FFmpeg workflow if you prefer command-line control and can maintain the configuration and its file inputs. It may be the more natural fit for a repeatable automation job you already understand. The trade-off is that visual review and adjustments may be less direct, and the local computer still has to remain powered and connected. Do not choose it solely on a claim that it will use less CPU.
If you do not want your own computer to be the thing that must remain on, a cloud-operated loop is a different operating choice. StreamNeo removes the specific burden of keeping the local PC running for the broadcast: you upload the video, provide your YouTube stream key, and it runs the 24/7 stream with your computer switched off. It is YouTube-only, so check that this matches your channel and workflow. As with any setup, you still need to prepare the video and verify the resulting broadcast in YouTube.
A short decision table can keep the choice grounded in what you actually need:
| Your priority | Starting point | Check before settling |
|---|---|---|
| Visual scene editing and easy framing review | OBS | Every source's fit, crop or stretch in the output canvas |
| A command-based process you can maintain | FFmpeg | That the fixed configuration handles every file as intended |
| Avoiding reliance on a powered local PC | A cloud-operated loop | Whether the service supports your destination and file workflow |
| A low-power local machine | Either tool, tested locally | Supported hardware encoder, modest output and stream health |
None of these choices guarantees a trouble-free night. Keep the playlist and stream simple at first, run a representative test, and decide how you will notice a failure. If a channel depends on a continuous broadcast, plan who can respond to a warning and how you will restart or correct the setup. For ways to think about file preparation and continuous playback outside a local PC, see how cloud loops handle a file uploaded once.
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 YouTube fix different resolutions in my playlist?
YouTube transcodes the incoming live stream to create playback formats for viewers on different devices and networks. It does not choose a consistent crop or repair how your sources are arranged; set the canvas and framing in your production setup before sending the stream.
Should I fit, crop or stretch a video to fill the frame?
Fit preserves the full image and its proportions, but can leave bars. Crop fills the frame while removing edges, so check that captions or important subjects remain visible. Stretch fills the space but distorts geometry, so it is usually a poor choice when accurate shapes or text matter.
Is FFmpeg always lighter on CPU than OBS?
No universal comparison is reliable for every machine and configuration. Output settings, encoder, source decoding and effects all matter. Test your own clips at the intended settings and monitor both the computer and YouTube's stream health.
Do I need a separate hardware encoder for a video loop?
Not necessarily. Check which hardware encoders your existing computer and software support, then test one with a modest output. A dedicated encoder may suit a more complex production, but a local playlist does not by itself require one.