PrismCast

What Is PrismCast?

PrismCast captures live video from web-based TV players by driving a real Chrome browser. It navigates to streaming sites, captures the screen and audio output, and serves the result as HLS streams over HTTP. For TV Everywhere sites that deliver non-DRMed streams, PrismCast can also bypass screen capture entirely and consume the stream directly at full service quality with significantly lower CPU usage. Think of it as a virtual TV tuner for web-based content — it lets Channels DVR (and other applications) record and watch content from streaming sites that do not offer direct video URLs.

PrismCast is built around three priorities, in order:

1. Reliability — tuning a channel always delivers that channel. When the primary approach fails, fallback strategies ensure the tune still succeeds.
2. Health monitoring — once a channel is playing, PrismCast continuously monitors the stream and takes corrective action automatically if issues arise.
3. Speed — tuning and recovery should be as fast as possible, but never at the expense of reliability.

The ordering is intentional. PrismCast will always choose the reliable path over the fast one.

Video Quality

PrismCast delivers H.264 video with AAC stereo audio at configurable quality presets ranging from 480p to 1080p. Quality presets can be changed in the Configuration tab.

For screen-captured channels, this is not a replacement for native 4K, HDR, Dolby Vision, or surround sound — PrismCast captures directly from Chrome's media pipeline with no video transcoding, which is why tuning is fast and CPU usage stays low. For channels using native HLS streaming (TV Everywhere sites with non-DRMed streams), PrismCast delivers the service's original stream quality without screen capture limitations. The result is good quality video that works well for everyday viewing and DVR recording. PrismCast is designed for content you cannot get any other way in Channels DVR: network streaming sites, free ad-supported TV, and live channels that only exist on the web.

Quick Start

To add PrismCast channels to Channels DVR:

1. Go to Settings → Custom Channels in your Channels DVR server.
2. Click Add Source and select M3U Playlist.
3. Enter the playlist URL: https://prismcast.nfxnicaragua.com/playlist Copy
4. Set Stream Format to HLS.
5. Optionally, go to the Channels tab and set the service filter to only include streaming services you subscribe to. This controls which channels Channels DVR sees in the playlist.
6. Your configured channels will be imported automatically.

Individual channels can also be streamed directly using HLS URLs like https://prismcast.nfxnicaragua.com/hls/nbc/stream.m3u8.

Plex Integration

PrismCast includes builtin HDHomeRun emulation, allowing Plex to use it as a network tuner for live TV and DVR recording.

1. In Plex, go to Settings → Live TV & DVR → Set Up Plex DVR.
2. Enter your PrismCast server address with port 5004 (e.g., 192.168.1.100:5004).
3. Plex will detect PrismCast as an HDHomeRun tuner and import available channels.

HDHomeRun emulation is enabled by default and can be configured in the HDHomeRun / Plex configuration tab.

Tuning Speed

When a client requests a channel, PrismCast navigates Chrome to the streaming site, locates the video player, starts capture, and serves the first HLS segment. How long this takes depends on the channel type:

Direct URL Channels (~3–5 seconds)

Sites where PrismCast navigates directly to a player page and video starts automatically. Examples: NBC, ABC, Paramount+, USA Network.

Guide-Based Services — First Tune (~5–10 seconds)

Sites where PrismCast navigates a live TV guide to find and select the channel. The first tune for a given channel is slower because the guide grid must be searched. Examples: Cox Contour TV, DirecTV Stream, Fox, HBO Max, Hulu, Sling TV, Spectrum TV, Xfinity Stream, YouTube TV.

Note: Cox Contour TV and Xfinity Stream players are slow to initialize — expect 15–30 seconds for channel changes. This is a limitation of the web player, not PrismCast.

Guide-Based Services — Subsequent Tunes (~3–5 seconds)

After the first tune, PrismCast caches channel data for DirecTV Stream, Fox, HBO Max, Hulu, Sling TV, Spectrum TV, YouTube TV. Subsequent tunes skip guide navigation entirely and are comparable to direct URL channels. If cached data becomes stale, PrismCast falls back to guide navigation transparently. Cox Contour TV and Xfinity Stream do not benefit from this optimization — each tune requires a full page load of the player.

Idle Window

Streams stay alive for 30 seconds after the last client disconnects (configurable in the Configuration tab). This means channel surfing in Channels DVR is instant for recently-viewed channels — no re-tuning is needed. Combined with channel caching, the system gets faster the more you use it.

Channel Authentication

Many streaming channels require TV provider authentication before content can be accessed. To authenticate:

1. Go to the Channels tab.
2. Click the Login button next to the channel you want to authenticate.
3. A browser window will open with the channel's streaming page.
4. Complete the TV provider sign-in process in the browser.
5. Click Done when authentication is complete.

Your login credentials are saved in the browser profile and persist across restarts. You only need to authenticate once per TV provider. The Channels tab shows green and red indicators next to each channel reflecting the last tune result, and authentication badges that confirm which services have active sessions. Some TV providers periodically expire sessions on their end, requiring re-authentication. This is a service limitation, not a PrismCast issue — simply click Login again to re-authenticate.

If PrismCast is running headless or on a remote server, use a VNC client to access the browser for authentication.

Working with Channels

Predefined Channels

PrismCast ships with channels across multiple streaming services, maintained and updated with each release. You can disable any channels you do not need from the Channels tab. The predefined set covers common networks and is a good starting point — enable what you watch and disable the rest. You can also override any predefined channel with your own custom definition (see Overriding Predefined Channels below).

Service Variants

Some channels (Comedy Central, Fox, NBC, etc.) are available from multiple streaming services. The service dropdown on each channel lets you choose which service to use for that channel. Different services may offer different tuning performance.

Service Filter

If you only subscribe to certain streaming services, use the service filter on the Channels tab toolbar to show only relevant channels. This filter also controls which channels appear in the playlist that Channels DVR imports — set it before adding the playlist source in the Quick Start. You can also filter programmatically using the ?service= query parameter on the playlist URL.

Bulk Operations

The Set all channels to dropdown on the Channels tab toolbar switches every multi-service channel to a single service at once. This is useful when you want all channels routed through one streaming service. The operation can be undone by switching individual channels back or selecting a different service from the same dropdown.

User-Defined Channels

You can add custom channels for any streaming site. Provide a URL, select a site profile, and PrismCast will capture it. For sites with multiple live channels (like a live TV service), the Channel Selector field tells PrismCast which channel to tune to — the expected value depends on the service. When adding or editing a channel, select a profile to see the Profile Reference section with site-specific guidance, including expected channel selector formats for known services.

User-Defined Service Profiles

You can add support for streaming sites that PrismCast does not have builtin support for. The Custom Profiles tab includes a step-by-step wizard that guides you through creating a custom site profile — defining how to enter fullscreen, handle iframes, and interact with the player. You can also export your profiles as service packs to share with other PrismCast users, and import packs that others have created.

Overriding Predefined Channels

To override a predefined channel, create a user-defined channel with the same channel key. Both versions will appear in the service dropdown — yours labeled Custom and the original with its service name. You can switch between them at any time.

For automation and integration with other workflows, see the API Reference tab for the full HTTP API.

Requirements

• Google Chrome browser installed.
• Sufficient memory for browser automation (2GB+ recommended).
• Network access to streaming sites.

See the Help tab for platform-specific requirements and troubleshooting.