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First check where PRISM Live Studio shows the “unsupported” warning. If it appears while adding a local video as a Media Source, investigate that file. If it appears while adding a camera or capture card, adjust the device’s format or resolution. If YouTube reports an error after PRISM starts streaming, check the outgoing stream settings instead. These are separate compatibility problems, and converting a local video will not necessarily fix a device or YouTube-ingest error.
Find out which format is being rejected
Note the exact warning and the moment it appears. Check whether the source is visible in PRISM’s preview, and whether the message appears in PRISM or YouTube Live Control Room. PRISM supports video files as Media Sources, while capture-device options depend on the camera or capture card. YouTube checks the stream PRISM sends; that is not the same as checking the file PRISM reads.
| When the warning appears | Likely issue | What to check |
|---|---|---|
| When adding or playing a local video in a scene | PRISM’s ability to read the file’s container or codecs | The file’s actual media properties and whether it plays as a Media Source |
| When activating a camera or capture card | A device format, resolution, or frame-rate combination the hardware does not support | Device Default, Video Format, resolution, and FPS |
| After starting a stream, in YouTube Live Control Room | The outgoing stream’s protocol, container, video/audio codec, profile, or encoder settings | YouTube’s current live-stream guidance and the specific dashboard error |
If PRISM rejects a local video file
PRISM’s FAQ confirms that video files can be added as Media Sources, but the available official information does not give a complete list of supported local-file containers and codecs. So there is no confirmed universal conversion preset to recommend here. In particular, do not assume that changing a filename extension fixes the file or that MP4/H.264 is guaranteed to work as a PRISM input.
- Inspect the file’s real media properties. Use a media information utility to identify the container, video codec and profile, audio codec, resolution, and frame rate. The extension alone does not identify all of these.
- Keep the original. If conversion appears necessary, make a separate copy so you can retry without losing the source.
- Choose a documented preset for your installed PRISM version. Confirm the expected input formats in current PRISM documentation or another reliable version-specific reference. The exact PRISM-compatible conversion preset is not established here, so do not treat a particular codec/container combination as guaranteed.
- Test the converted copy in PRISM before going live. Add it as a Media Source in a scene and confirm that it appears and plays correctly in the preview.
- Start a stream only after the source works locally. If YouTube then reports a format error, troubleshoot the outgoing encoder settings separately.
YouTube’s upload encoding recommendations list MP4, H.264 video, and AAC-LC, Opus, or Eclipsa Audio. Those are recommendations for uploads; they do not establish PRISM’s local Media Source compatibility or, by themselves, the requirements for your live stream. See YouTube’s recommended upload encoding settings.
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If the source is a camera or capture card
On Windows, PRISM’s guide says available formats depend on the selected device and can vary with output resolution. A custom resolution and FPS combination may be unsupported even if the device itself works. These are device-input settings, not reasons to convert a stored video file.
- Open the source’s device settings in PRISM. Select the camera or capture card that is producing the warning.
- Return the device to Device Default. This is PRISM’s recommended starting point when a custom resolution or frame rate causes an unsupported-attribute issue.
- If needed, try Video Format “Any”. If the warning remains, reduce the selected resolution or FPS to a combination the device supports.
- Leave color space and range at Default unless the hardware supports the selected HDR mode. A setting the device cannot provide may cause a separate incompatibility.
- Check the PRISM preview again. If the device now appears, the issue was its input configuration rather than a local video’s encoding.
These recommendations apply to Windows device sources described in PRISM’s Video Capture Device guide; available settings can differ by device.
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If YouTube reports “Incorrect stream format”
A YouTube Live error concerns the incoming stream, not automatically the file used as a PRISM source. YouTube says an “Incorrect stream format” warning can involve the container, video codec or profile, or audio codec. For the documented error case, its guidance recommends H.264 video and AAC audio. Use the exact dashboard message and your chosen ingestion method to narrow down the cause; do not infer that the source file needs conversion just because the outgoing stream has a format error. See YouTube’s live-streaming error guidance.
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YouTube describes an encoder as software or hardware that converts video into a digital format for streaming. Encoders can be used with screen or gameplay capture, external audio/video equipment, and multi-camera productions. That outgoing encoding role is distinct from PRISM opening a local Media Source. See YouTube’s encoder overview.
Common troubleshooting mistakes
- Renaming the extension: This changes the filename, not necessarily the container or codecs inside it. Inspect the actual media properties instead.
- Converting the file when a device is selected: A capture-card or camera warning calls for supported device settings, not a conversion of an unrelated file.
- Changing the source file for a YouTube ingest error: First check the live encoder output, including protocol and audio/video format.
- Using upload recommendations as live-stream requirements: YouTube’s upload page and live encoder page address different workflows.
- Changing several settings at once: Adjust one relevant setting, then recheck the source preview or YouTube’s incoming stream status. This makes it easier to tell which change mattered.
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