If you need to send a prerecorded video file from a phone to YouTube Live, the reviewed documentation does not establish that either Streamlabs Mobile or Larix Broadcaster can use a local file as its live video source. Their documented roles point instead to mobile creator tools and live encoding, so choose between them for camera or screen capture only after checking the current app workflow.
That distinction matters more than the feature lists. A stream can reach YouTube over RTMP and still not offer a control for selecting a video stored on your phone; do not treat the ability to connect as proof of file playback.
Start with the file requirement
For a file-based stream, the first question is not which app has more overlays or protocols. It is whether the software can open a local media file, send its picture and sound as the live programme, and keep doing so for the period you need. The official descriptions reviewed here do not confirm that either app does this.
That leaves an important gap between the phrase “streaming prerecorded video” and the documented use cases. A camera app can capture a live scene. A screen-broadcast tool can send a phone’s display. An encoder can publish a live audiovisual feed to YouTube. None of those facts, by itself, demonstrates local video-file playback.
This distinction is especially useful if your goal is a loop: a bhajan recording overnight, a lofi video for study, a showroom product reel, or a local-news package repeated through the day. You need an explicitly documented playback source and a way to handle repeat, audio, and interruption behaviour. Do not build a long-running channel around a feature inferred from a similarly named app or a connection setting.
The prerecorded-loop latency guide is useful once you have a playback workflow, but latency settings do not make a mobile encoder accept a file. Keep source selection, encoding, and YouTube delivery as separate decisions.
What Streamlabs Mobile documents
Streamlabs presents its mobile app as a creator-oriented way to broadcast from a phone. Its product page describes live camera and mobile-game streaming alongside production tools such as scenes, alerts, widgets, chat-related features, and tipping. That emphasis is useful when the content is happening in front of the phone or on its screen and you want presentation controls close to the broadcast. See the Streamlabs Mobile product page for its own current description.
A scene-based workflow can help you arrange a live camera view with overlays or switch between designed layouts. Alerts and widgets can add context for viewers, and chat features can make a live session easier to manage. These are production features around a live programme; they do not establish that you can select an MP4 or another local file and use it as the programme picture.
The support article for mobile multistreaming describes selecting platforms or a custom RTMP destination, adjusting broadcast settings such as bitrate and frame rate, and entering stream details such as title, description, thumbnail, and privacy before going live. It also says that mobile multistreaming requires Streamlabs Ultra or rewards redemption. Because access terms can change, check the current mobile multistreaming instructions rather than relying on an old setup guide.
For a one-phone live broadcast, the integrated tools may reduce the number of separate controls you need to manage. That is a real advantage if you are presenting, gaming on the phone, or switching between live scenes. It is not an answer to the file-source requirement: the cited Streamlabs material reviewed for this comparison describes capture and creator workflow, not local prerecorded-file input.
If your content is primarily a video that must replay while you are away, ask a narrower question before installing or subscribing: does the current Streamlabs Mobile version explicitly document local file playback as a live source, including the format and loop behaviour you need? If the answer is unclear in the listing or support material, test with a non-critical broadcast and confirm the result in YouTube Studio before planning a schedule around it.
What Larix Broadcaster documents
Larix Broadcaster is described by Softvelum as a mobile live video and audio streaming app, with a more encoder-oriented set of controls. Its product material lists a range of output and transport choices, including RTMP and RTMPS, as well as SRT and other protocols. That breadth may matter to someone who needs to connect a live feed to a particular destination or configure how it is delivered. The Larix Broadcaster product page is the appropriate place to check current features and platform requirements.
The documented focus is configuring and publishing a live feed, rather than arranging a creator’s show inside the app. Someone who understands the destination’s connection details may appreciate the direct protocol workflow. Someone new to streaming may find the language of server URLs, stream keys, and transport protocols less intuitive than choosing a platform and filling in a stream-information form.
Softvelum’s documentation gives a YouTube RTMP connection pattern: use YouTube’s server or application URL together with the stream key in Larix’s Connection URL field. This is useful evidence that Larix can be configured as an encoder for a YouTube Live workflow. It is not evidence of where the video comes from before encoding. The Larix documentation reference explains the connection arrangement.
Larix also has a separately named product, Larix Player. Do not use the existence of a playback app as evidence that Larix Broadcaster can take a local file as its source. These are distinct products, and the reviewed Broadcaster documentation does not confirm local prerecorded-file input.
If your source is a live camera, Larix’s protocol controls may be more relevant than an integrated scene-and-widget environment. If the source must be a saved video, verify that exact action in the current Broadcaster documentation or through a carefully controlled test; protocol support cannot settle it for you.
The YouTube connection workflows differ
Both apps can be part of a mobile workflow aimed at YouTube Live, but the documented path to YouTube differs. Streamlabs describes a creator-facing flow in which you select a destination or custom RTMP target, adjust broadcast settings, and fill in stream information before starting. Larix describes a connection assembled from YouTube’s RTMP endpoint and the key, entered in a connection field.
| Decision point | Streamlabs Mobile | Larix Broadcaster |
|---|---|---|
| Documented emphasis | Mobile creation, scenes, alerts, widgets, and platform workflow | Live encoding and configurable protocol output |
| YouTube setup described | Platform or custom RTMP destination, with stream details before going live | YouTube RTMP server URL and stream key entered as a connection URL |
| Useful when | You want creator tools around a live camera or mobile-screen broadcast | You want encoder-style connection and transport controls for a live feed |
| Local prerecorded file input | Not established by the reviewed official material | Not established by the reviewed official material |
The table is a summary of documented emphasis, not a complete feature audit. Apps change, features can differ by platform, and the available workflow may vary by account or app version. Check the app’s current listing and help material before committing to a setup, especially if you depend on a particular control.
Whichever app you use, YouTube remains a separate part of the workflow. Its current encoder setup guidance covers the broad process of creating a live stream and connecting an encoder. Check YouTube Help for current live-stream activation, eligibility, privacy options, and stream-key handling. Eligibility and restrictions can be account-specific, so a successful app connection should not be assumed in advance.
A stream key is a credential that allows a connected encoder to send to your broadcast. Use the key intended for the correct stream, keep it out of screenshots or public notes, and follow YouTube’s current instructions if you need to replace or revoke it. Do not paste a key into a public forum while troubleshooting. Neither app’s successful connection process changes the need to manage the key carefully.
What the documentation does not establish
The limits of the available evidence are straightforward. The reviewed Streamlabs material establishes live camera and mobile-game capture, production tools, and a mobile connection workflow. The reviewed Larix material establishes live encoder output, protocol choices, and a documented YouTube RTMP setup. Neither set of sources confirms that its named app can select a prerecorded local video file as the outgoing live picture.
That does not prove the feature is impossible in every current build or configuration. It means the sources reviewed for this comparison do not establish it, and a reader should not act as if the capability is documented. The practical next step is to look for a current, explicit instruction showing the file-selection action and the resulting YouTube broadcast, rather than relying on a generic claim that the app “streams video”.
You can test an app if you have access to it, but test the precise path you intend to use: choose the stored file, start a private or otherwise controlled broadcast, confirm video and audio arrive as expected, and determine whether playback ends, pauses, or repeats. Check the current YouTube privacy controls and restrictions before making a test public. A short test can answer a product-version question; it does not promise that an app will behave the same after an update.
Do not infer the missing capability from overlays, scenes, or widgets. Those tools affect what can be placed around or over a live capture source. Do not infer it from RTMP support either: RTMP describes a delivery path, not necessarily the media source. And do not infer it from Larix Player, which is a separate playback app, rather than the Broadcaster product being compared.
For a 24/7 channel, the distinction has operational consequences. A phone app designed around an active presenter or a mobile game may assume you are present to start and supervise the session. A file loop needs repeat behaviour, dependable handling of long runtimes, and a recovery plan if the broadcast or device stops. The OBS settings guide for 24/7 YouTube streaming in India discusses a different class of continuous broadcast workflow; use it to frame what needs testing, not as proof that either mobile app supports file playback.
Choose by source, not by feature count
If the source is a live camera, decide which operating style fits you. Streamlabs may suit a creator who wants scenes and audience-facing tools within a mobile workflow. Larix may suit someone comfortable configuring an encoder connection and who values transport choices. Neither is automatically the better camera app for every phone, network, or broadcast.
If the source is the phone’s screen, Streamlabs’ documented mobile-game use case makes it worth examining first. You should still verify that the exact screen-capture path works on your device and for your intended YouTube destination. Larix’s encoder role may be relevant to live inputs, but its protocol list does not establish a general phone-screen workflow or file playback.
If the source is a local video file, treat the comparison as unresolved until you find explicit documentation or run a test. The right decision may be to use a playback-and-encoder workflow that clearly supports media-file input, rather than asking either of these apps to do a job its reviewed materials do not establish. The recorded church service workflow for Windows is a relevant example of evaluating a file-first route, though its setup is not necessarily the right choice for a phone-only operator.
There is a further choice if what you need is not a phone-controlled broadcast but a channel that keeps playing while your computer is off. In that situation, the operational requirement is continuous file playback and recovery rather than mobile camera production. StreamNeo can remove the need to leave your own computer running by taking an uploaded video and a YouTube stream key for a continuing broadcast, monitored and restarted if it drops; it is YouTube-only, so it does not replace a mobile app when your source is a live phone camera.
| Your actual source and schedule | What to check first | Why |
|---|---|---|
| Live phone camera | Scene controls, audio handling, connection stability, and how you manage the session | Both apps are documented for live streaming, with different workflows |
| Mobile game or screen | Current device permissions and app support for screen capture | Streamlabs documents mobile-game streaming; validate your device path |
| Saved video file | Explicit local-file input, playback controls, and repeat behaviour | Neither app’s reviewed documentation establishes this source |
| Continuous channel while away | Playback continuity, restart handling, monitoring, and key security | This is an always-on operating problem, not merely a mobile connection choice |
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
Can Streamlabs Mobile stream a prerecorded video to YouTube Live?
The reviewed official material describes camera and mobile-game streaming, creator tools, and destination setup, but does not establish local prerecorded-file input. Check the current app documentation or test the exact file workflow before relying on it.
Can Larix Broadcaster play a video file into a YouTube live stream?
The reviewed Softvelum material documents Larix Broadcaster as a live encoder and explains a YouTube RTMP connection, but does not establish local-file playback. Larix Player is a separate app and does not answer the Broadcaster question.
Which app is better for a live camera or mobile screen?
Streamlabs’ documented creator tools may suit a camera or mobile-game broadcast where scenes and audience features are useful. Larix may suit an encoder-oriented workflow with configurable protocols. Check current device support and test the route you plan to use.
What should I use for a 24/7 prerecorded loop?
Start with a workflow that explicitly documents local video playback, looping, and recovery, then verify YouTube’s current requirements and your account’s access. Do not assume a mobile app’s RTMP or live-capture features mean it can run a file loop unattended.