To stream a pre-recorded video on YouTube with PRISM Live Studio, add the local file as a Media Source in PRISM Desktop, place it in a scene, check the program, then start a YouTube Live broadcast. The file is a source in a live stream; it is not uploaded to YouTube by this workflow.
The key detail is Studio Mode: its edit view can show changes that viewers cannot yet see. Review the live program side before you start, and apply any changes you intend to broadcast.
Confirm you are using PRISM Desktop
These steps are for PRISM Desktop on Windows or Mac, not the PRISM mobile app. PRISM's desktop guide describes scenes and sources as the building blocks of a broadcast, and its Media Source guide explains how to select a local file for a scene. PRISM's official Getting Started with PRISM Desktop guide is the place to check the current system requirements and layout, since product requirements can change.
This distinction matters because PRISM also documents a Media Playlist feature for Android and iOS. That is a separate mobile workflow. The desktop instructions here establish that a selected media file can be used as a source; they do not establish a desktop playlist for queuing multiple videos in sequence.
Before opening PRISM, identify the file you intend to broadcast and make sure it is accessible on the computer. You are preparing a live programme from that local media, not uploading it to your YouTube channel. PRISM's FAQ says that media files such as videos, images and audio clips can be used in a live stream; that describes their use as live sources, not as uploaded YouTube videos.
If your goal is an always-on channel built from several recordings, first decide whether you need to switch deliberately between sources or simply play one file. An article on switching between recorded videos in OBS covers a different desktop workflow and may help clarify what you expect from a multi-video setup. Do not assume its controls apply to PRISM.
Add a local file as a Media Source
Open or select the scene you want to use, then use the Sources control to add a source. Choose Media Source and select the local video file. The exact labels and positions in the app can change between versions, so use PRISM's Media Source guide if the current interface differs from the one you see.
A Media Source puts the selected media into the scene. It does not create a YouTube upload, schedule a Premiere, or publish anything on its own. The broadcast begins only after you connect the channel and start a live stream.
When the source options appear, take care with the playback setting named “Restart playback when source becomes active”. PRISM documents an issue in Studio Mode in which a newly added media source may not begin playing automatically. Its guide gives two ways to address it: turn off that restart option before confirming the source, or leave the setting as it is and use Apply in Studio Mode after adding the source. These are troubleshooting alternatives from the product guide, not a claim that one works better in every setup.
Once the source is added, check that the picture appears in the scene and that any audio you expect from the video is present. Keep the scope modest for the first test: establish that this file appears and plays as intended before adding overlays or other sources. If you add more elements later, each one becomes another part of the scene that needs to be reviewed in the program view.
Place the source in the intended scene
A scene is the layout that PRISM uses for the broadcast; a source is one of the things shown or heard within that layout. Select the scene intended for the video, then confirm that the Media Source belongs to that scene. If you have several scenes, adding a file to one does not mean it will appear in every other scene.
Look at the composition before you go live. Confirm the video is visible in the canvas and is not obscured by another visual source. If you use a logo or text overlay, check that it does not cover an important part of the picture. The preview is also the point to notice an unintended blank region or an incorrect scene selection, rather than discovering it after viewers have joined.
For a simple broadcast, one scene containing the video may be sufficient. A more involved programme might use a separate opening or holding scene, but each scene switch is an action you must manage during the live broadcast. Do not build a complicated layout merely because PRISM permits multiple sources; start with the arrangement that matches the actual programme.
If the file is one part of a continuous channel, consider how you will handle the end of playback and the next programme. The desktop Media Source instructions support selecting a media file as a source, but the sources reviewed do not document a desktop playlist control for automatically ordering multiple files. For a different approach to a continuously played archive, see the practical context in streaming a Telugu podcast archive continuously. That is a separate setup, not a PRISM Desktop playlist recipe.
Use Studio Mode to review the program
Studio Mode separates editing from the live output. PRISM's desktop documentation describes an EDIT view and a LIVE view: the left side is where you prepare changes, while the right side represents what viewers currently receive. Changes made in the edit view do not reach viewers until they are applied to the live side.
This distinction is useful before the broadcast and important during it. You can adjust the scene in EDIT without immediately replacing what is on LIVE. Before starting, however, make sure you have applied the arrangement you actually want viewers to see. A correct-looking edit preview is not enough if the live programme side still shows something else.
If the media does not play after you add it, use one of PRISM's documented remedies. Either disable “Restart playback when source becomes active” in the source options before confirming, or add the source and click Apply in Studio Mode. Then check the LIVE/program side again. The Apply step matters because a change left only in EDIT has not yet become the output.
Think of the two views as preparation and transmission, not as two simultaneous broadcasts. For example, if the LIVE side is showing a holding image while you adjust the video source on the EDIT side, viewers continue to see the holding image until you apply the change. This gives you room to prepare, but it also creates an easy mistake: assuming that the left-side preview is already on air.
For a stream you intend to leave running, also decide what you will do if the media ends or the scene needs attention. PRISM's cited guide explains source use and the Studio Mode playback issue; it does not promise a particular looping behaviour for every file or version. Test the actual file and the intended run before treating the setup as suitable for unattended use. A separate guide to monitoring a remote 24/7 YouTube stream explains why a long-running broadcast needs observation beyond the initial scene check.
Connect PRISM to YouTube Live
In PRISM Desktop, add or select your YouTube channel from the channel list, then set the live details in Live Information. The desktop guide describes fields such as title, category and visibility, along with other available stream details. Review them before starting; viewers see the live event information, not the name you gave a local source.
The general sequence in PRISM's guide is to link the channel, set stream information, prepare scenes and sources, and then use Go Live. PRISM describes a confirmation or editing step followed by a second Go Live action to begin the broadcast. Read each confirmation in the interface rather than assuming that selecting the channel or preparing the event has already made you live.
PRISM says live information can be changed before going live or during a stream, but editing event details is not the same as changing the scene's video source. Keep the two tasks distinct: event information identifies the YouTube live stream, while the Media Source contributes picture or sound to the programme.
Check YouTube's current eligibility and live-streaming requirements in its official YouTube Help information about live streaming. The research for this guide did not verify current account eligibility or every policy condition, so do not treat a working PRISM connection as proof that a channel is eligible or that any particular content is permitted. Check the current official guidance for your account and content.
If the live is meant to be part of a recurring channel, plan the operating side as carefully as the scene. A local-file workflow depends on the computer and PRISM session remaining available for the broadcast. Readers comparing that with a cloud-based approach can use the guide to keeping a YouTube stream running without a PC left on as a separate operating-model discussion; it is not a PRISM setting or a promise about this desktop workflow.
Preview before starting the broadcast
Before pressing the final Go Live control, inspect the program as a viewer would receive it. Confirm the intended scene is on LIVE, the video is visible, and the expected audio is present at a sensible level. If you have added other audio or visual sources, check those too; a video that looks right but has missing sound is not ready for an audience.
PRISM documents a YouTube Rehearsal option in its YouTube Live Info window. Its YouTube Rehearsal guide says the rehearsal is available only for YouTube, is disabled during multistreaming, and does not produce a replay. Use it as a check of broadcast settings where available, not as a recording you can rely on reviewing later.
A useful pre-flight is to look at the LIVE side, listen to the programme audio, and verify the event title and visibility. If you are using Rehearsal, check its result while it is available; do not assume you can recover a replay afterwards. Then start the actual broadcast through PRISM's Go Live flow and confirm that the live status is active before leaving the workstation.
A preview is a check, not a guarantee. It cannot establish that a stream will remain uninterrupted for an entire night, that YouTube will approve every piece of content, or that the video is suitable for an unattended schedule. For an always-on channel, make a separate plan for checking the live state and responding if the broadcast stops.
Keep live streaming distinct from uploads and Premieres
This workflow sends the output of PRISM Desktop to YouTube Live. The local video remains a media source in a live programme; adding it to PRISM does not place an uploaded video in your YouTube library. A YouTube upload is a separate publishing action with its own video page and controls.
A Premiere is also a different YouTube format. It is an uploaded video presented as a scheduled viewing event, rather than a live broadcast produced by PRISM from a local Media Source. If you need a video to be available on demand, investigate YouTube's upload workflow. If you need a scheduled communal viewing of an uploaded video, look at the current Premiere options in YouTube Studio. Neither is accomplished by selecting Media Source in PRISM.
The mobile Media Playlist feature should not be folded into these desktop steps either. PRISM's documentation places that feature in its Android and iOS guides, while its desktop guide here covers adding a selected file as a source. If your requirement is a sequence of files, check the documentation for the exact device and version you plan to use; do not infer that the mobile playlist controls exist in Desktop.
In short, choose the workflow by the result you want: a live broadcast of a local source, an uploaded video people can watch later, or a scheduled Premiere of an upload. The labels may sound similar because each can involve a pre-recorded file, but the publishing and viewing experience differs. Decide that first, then prepare the right event rather than trying to turn one workflow into another inside PRISM.
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FAQ
How do I play a prerecorded video during a YouTube livestream?
In PRISM Desktop, add the local file as a Media Source in the scene you intend to broadcast. Review the LIVE side in Studio Mode, apply the prepared scene if needed, connect your YouTube channel and use PRISM's Go Live flow.
Why is the video not playing after I add it?
PRISM documents that a Media Source may not play automatically when added in Studio Mode. Its guide suggests either turning off “Restart playback when source becomes active” before confirming the source, or clicking Apply in Studio Mode after adding it.
Does PRISM Desktop's Media Source upload my video to YouTube?
No. It uses the local file as a source in a YouTube live broadcast. Uploading an on-demand video or setting up a Premiere is a separate YouTube workflow.
Can I use PRISM's mobile playlist steps on Desktop?
Do not assume so. PRISM documents Media Playlist for Android and iOS, while the desktop instructions covered here describe selecting a local file as a Media Source.