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To connect Castr to Facebook Live with a custom RTMP destination, copy Facebook Live Producer’s Server URL and Stream Key, enter them in Castr’s Facebook Live destination using Setup with Server/Key, start the stream from Castr, then click Go Live in Facebook Live Producer. The Facebook URL and key are destination credentials; they are not the separate RTMP ingest URL and key an encoder uses to send video into Castr.
Before you start: distinguish the two RTMP connections
This setup links Castr to Facebook Live. Facebook’s Server URL and Stream Key tell Castr where to send the finished stream. If you use an encoder as a source for Castr, that encoder instead needs Castr’s own source-ingest URL and key from Castr’s Stream Source Setup panel. Using Facebook’s credentials in the encoder’s Castr source settings will not connect the source correctly. See Castr’s guide to finding stream key, RTMP and SRT details.
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Connect Facebook Live to Castr with Server/Key
- Open a Castr livestream. Sign in to Castr and open an existing livestream project or create one. Castr’s livestream setup guide describes the current project and destination flow. Available destination counts depend on your Castr subscription.
- Add Facebook Live as a destination. In the stream dashboard, choose Add destination (or the corresponding platform-add control), select Facebook Live, and choose Setup with Server/Key. This is the manual custom-RTMP route, rather than Castr’s separate Facebook account-linking flow.
- Get Facebook’s destination credentials. Open Facebook Live Producer, select Use Stream Key, and copy the Server URL and Stream Key shown in the Live Stream Setup panel. Facebook may offer a persistent stream key for reuse. Keep the key private; anyone with access to it may be able to send a stream to the destination.
- Enter the values in Castr. Paste Facebook’s Server URL into Castr’s Streaming Server field and Facebook’s Stream Key into Streaming Key. Add the stream title and description and select or configure the stream source, then save or add the destination. Castr documents this field mapping in its Server and Key setup instructions.
- Start the stream from Castr. Start sending video from your chosen source through Castr. This makes the incoming stream available to Facebook, but does not finish the Facebook broadcast.
- Go live in Facebook Live Producer. Return to Producer and click Go Live manually after Castr starts. Castr specifically notes that this manual step is required for the Server/Key route in its Facebook Live connection guide.
- Verify the destination. Confirm that Producer shows the broadcast as live and that the intended Facebook Page or profile is selected before sharing it with viewers.
Facebook’s interface labels and placement can change; look for the stream-key setup and live controls in the current Live Stream Producer screen if they differ from the labels above.
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Server/Key or Facebook account linking?
| Route | What you do | What to keep in mind |
|---|---|---|
| Server/Key (custom RTMP) | Copy Facebook’s Server URL and Stream Key from Producer and enter them as Castr’s Streaming Server and Streaming Key. | Start the stream from Castr, then click Go Live in Facebook Producer manually. |
| Facebook API/account linking | Use Continue with Facebook in Castr and follow the account-selection flow. | This is a separate connection method; supported destinations and plan eligibility can depend on Castr’s current offering. |
Castr’s earlier documentation describes API linking as a way to select supported Facebook destinations, while its current livestream guide says destination count depends on subscription plan. Castr’s June 2024 article said Facebook API integration was available on Multistream Plus and above and that Pages required a paid Castr plan. Those are dated plan statements, not a guarantee of current eligibility; check the plan details and destination options in your Castr account before relying on them. See Castr’s Facebook API integration article.
#1 Best Overall
Guermok Video Capture Card, 4K USB3.0 HDMI to USB C, 1080P 60FPS & 2K 30FPS | Capture Card for Streaming, Compatible with iPad Mac OS Windows, Quest 3, OBS, PS5/4, Switch2/1, Xbox, Camera (Silver)
- 【1080P 60FPS Video Capture Card】 This HDMI game capture card is based on USB3.0 high speed transmission port, input resolution up to 4K@30HZ, output resolution up to 2K@30Hz or 1920×1080@60Hz. Type c and USB interface can meet most of the devices in daily life. Easily meet the online capture, real-time recording, online meetings, live gaming and other functions, so you have a better visual enjoyment. Note: For capture use only; requires capture software to function and is not intended for direct screen casting to a monitor or TV
- 【Ultra Low Latency Screen Sharing】 HDMI capture card is made of good quality aluminum alloy with strong heat dissipation, allowing you to enjoy ultra low latency while live gaming or video recording or live streaming, avoiding blue screens and lag. This HDMI to USBC capture card supports easy recording of good quality audio or HD video and transferring it to your computer or streaming platform, allowing you to record 60 fps HD video directly on your hard drive and real-time preview
- 【Plug and Play, Easy to Carry】 This HDMI 1080P video capture card does not require any additional drivers or external power supply, just plug and play for fast capture. The capture card is small and lightweight, so you can put it in your bag for emergencies, making it very portable for outdoor live streaming. It's also a great way to share content in game recording, video conference, video recorder and online teaching
- 【Wide Compatibility USB Capture Card】 Easily streams to Facebook, Youtube or Twitch. With the connection, this HDMI to USB C/3.0 video capture devices can be working on several Operating Systems and various software: Windows 7/ 8/ 10, Mac OS or above, Linux, Android, Laptop, Xbox One, PS3/PS4/PS5, Camera, DVDs, Set Top Box, Webcame, DSLR, Switch/Switch 2, TV BOX, HDTV, Potplayer/VLC, ZOOM, OBS Studio etc.
- 【Package Content & Note】 1x HD Audio Capture Card , 1x USB 3.0 to USB C Adapter (A-side 3.0, B-side 2.0), 1x user manual. Please note that you need to restart the OBS Studio software after the audio setup is complete, otherwise it will result in no sound output. When using an adapter, if the device is recognized as USB 2.0, try using the other side with the USB-C port. Simply flip the capture card and reconnect it to be recognized as USB 3.0
Troubleshooting the connection
No video reaches Castr
- Check whether your encoder is sending to Castr’s source-ingest URL and key, not Facebook’s destination URL and key.
- In Castr, retrieve source credentials from Stream Source Setup. The encoder-to-Castr connection and Castr-to-Facebook destination are separate links.
Castr is sending, but Facebook is not live
- For Server/Key setup, return to Facebook Live Producer and click Go Live after Castr starts. Castr does not complete that manual Producer action for you.
- Confirm you are viewing the intended Facebook destination and that the stream preview is receiving video before going live.
Facebook destination does not connect
- Check that Facebook’s Server URL is in Castr’s Streaming Server field and the Facebook Stream Key is in Streaming Key.
- Copy the credentials again from the correct Facebook Live Producer session if the values may have been truncated, mistyped or replaced.
- If using a persistent key, check that the persistent-key option is enabled in Producer and that you pasted that key rather than a different session’s key.
An encoder asks for Castr ingest username and password
Castr’s July 2, 2026 source-credential guide says username and password are not required for that encoder-to-Castr ingest workflow; leave those fields empty. This advice concerns Castr source ingest, not Facebook destination credentials.
The destination or API option is unavailable
Check Castr’s current plan and the destination controls in your account. Destination limits and API eligibility can vary by subscription, and Castr’s specific Facebook API plan language cited above dates to June 2024.
Rank #2
Audio Express AXHDCAP 4K HDMI Video Capture Card, Cam Link Card Game Audio Adapter HDMI to USB 2.0 Record Capture Device for Streaming, Live Broadcasting, Video Conference, Teaching, Gaming
- [Enhanced 4K-1080P Video Capture Experience] Capture the Magic: Elevate your video recordings to new heights with our upgraded anti-static 1080P Video Capture Card. Immerse yourself in stunning visuals, supporting HDMI input at 4K 60FPS and USB output for capturing in 1080P, complete with rich stereo sound. Enjoy crystal-clear video recordings, dynamic gaming live streams, and professional conference broadcasts. Note: HDMI resolution: Max input can be 3840×2160@30Hz / Video output resolution: Max output can be 1920×1080@30Hz
- [Seamless Real-Time Preview] Stay in the Moment: Our advanced ultra-low latency technology ensures seamless real-time transmission of video streams. Experience instant, lag-free previews, allowing you to capture every detail precisely. Effortlessly record video directly to your hard disk, all without compromising on quality or introducing any delays.
- [Versatility and Broad Compatibility] Your Creative Hub: Connect your DSLR, camcorder, or action camera to a wide range of operating systems, including Windows, MacOS, and Linux. Unlock a world of possibilities with real-time streaming to popular platforms like Twitch, Youtube, OBS, Zoom, Potplayer, and VLC, giving you the tools to share your content effortlessly.
- [Effortless Plug and Play] Simplicity Redefined: Say goodbye to complex installations. Our plug-and-play design eliminates the need for drivers or external power supplies. Seamlessly integrate high-definition acquisition into various scenarios, whether it's educational recordings, immersive gaming, precise medical imaging, captivating live streams, or professional broadcasting.
- [Seize Every Detail with Precision] Unleash your creativity and attention to detail with our video capture card. Capture every nuance, every color, and every moment with precision, thanks to the enhanced capabilities of our technology. Whether you're a content creator, a gamer, or a professional, our capture card empowers you to seize the finest elements and bring them to life in your recordings and live streams.
Or let it run in the cloud
If your goal is a YouTube channel that stays live from uploaded videos, StreamNeo is a different workflow from sending a Castr production to Facebook Live: it loops uploaded videos to YouTube from the cloud. Upload a recording or build a playlist, add your YouTube stream key once, and go live. Your computer and home connection do not need to stay on. It streams the file as uploaded, up to 4K 60fps, at one flat price per slot; it can recover automatically if YouTube drops the stream. The first day is free with no card. The monthly plan is $9.99 per month. Visit StreamNeo or start your free day.
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Quick Recap
SaleBestseller No. 4
Best Value
Capture Card, USB Video Capture Card Device, Audio Video Converter Grabber for RCA to USB-Convert VHS Mini DV VCR Hi8 DVD to Digital, for PC TV Tape Player Camcorder, MAC Windows Vista Compatible
- AV TO USB Converter: Capture videos and audios from VHS, VCR, Hi8, DV tapes to a PC, with the help of our USB Video Converter. Save room while digitizing your favorite old memories
- Quality Capture Card: Our USB Video Capture Card converting anolog RCA composite input into HD 720P USB output and capturing audio without any sound card. Advanced signal processing technology provides you with great precision, colors, resolutions, and details.
- Plug and Play: Automatically install the driver once you hook up this RCA to USB Converter to a PC. No external power is needed. User-friendly and easy to operate
- Wide Compatibility: The Video Capture Card can work with video devices with RCA connector or S-Video connector, such as VHS, VCR, Hi8, camcorder, compatible with Windows and Mac OS. Support video formats like NTSC, PAL, and support brightness, contrast, hue, and saturation control
- Note: The Video Converter is used with acquisition software. We recommend OBS Studio or PotPlayer for Windows, and QuickTime Player for Mac. They can be downloaded for free online. Please operate according to the steps in User Manual or contact us if you have any questions
Rank #4
Sale
Capture Card, 4K HDMI Video Capture Card, Game Capture Card, 1080P 60FPS Video Capture Device, HDMI to USB 3.0 Capture Card for Streaming, Work with Camera/Xbox/PS4/PS5/PC/OBS
- 【1080P HD High Quality】Capture resolution up to 1080p for video source and it is ideal for all HDMI devices such as PS4, PS3, Xbox One, Xbox 360, Wii U, DVDs, DSLR, Camera, Security Camera and set top box. Note: Video input supports 4K30/60Hz and 1080p120/144Hz. Does not support 4K120Hz/144Hz. Output supports up to 2K30Hz.
- 【Plug and Play】No driver or external power supply required, true PnP. Once plugged in, the device is identified automatically as a webcam. Detect input and adjust output automatically. Won't occupy CPU, optional audio capture. No freeze with correct setting.
- 【Compatible with Multiple Systems】suitable for Windows and Mac OS. High speed USB 3.0 technology and superior low latency technology makes it easier for you to transmit live streaming to Twitch, Youtube, Facebook, Twitter, OBS, Potplayer and VLC.
- 【HDMI LOOP-OUT】Based on the high-speed USB 3.0 technology, it can capture one single channel HD HDMI video signal. There is no delay when you are playing game live.
- 【Support Mic-in for Commentary】Rybozen capture card has microphone input and you can use it to add external commentary when playing a game. Please note: it only accepts 3.5mm TRS standard microphone headset.
Rank #3
Video Capture Card, 4K USB3.0 HDMI to USB C, 1080P60FPS HDMI Capture Card for Streaming, Gaming, Video Recording Compatible with Switch, Xbox, PS4/5, OBS,iPad Mac OS Windows,Camera, Zoom(Silver)
- 【4K HDMI Input, 2K@30Hz Recording】Powered by a true USB 3.0 high-speed interface, the capture card supports up to 4K@30Hz HDMI input and records at 2K@30Hz or 1080P@60Hz. Perfect for gamers, streamers, and professionals who need crisp, smooth video for live streaming, gameplay recording, or online meetings.
- 【Ultra Low Latency Screen Sharing】Built with a premium aluminum alloy shell and advanced chipset for stable heat dissipation, ensuring ultra-low latency transmission. Capture high-quality video and dual-channel audio in real time—no lag, no frame drop—ideal for Twitch, YouTube, or OBS streaming.
- 【Easy Plug and Play, Compact & Portable】No driver or external power required—just plug and play via USB 3.0 or Type-C connection to your Windows or macOS computer. Lightweight and compact design makes it easy to carry for outdoor streaming, live shows, or mobile recording setups.
- 【Wide Compatibility & Multi-Device Support】Compatible with Windows 7 8 10 11, macOS, Linux,Android and supports most popular software such as OBS, Zoom, VLC, Twitch Studio, and more. Works seamlessly with PS4, PS5, Xbox, Switch, DSLR cameras, TV boxes, and other HDMI-output devices for streaming to YouTube, Twitch, etc.
- 【What You Get】Includes: HDMI Capture Card, USB 3.0 to USB-C Adapter, User Manual. Tips: Make sure your tablet’s OTG function is enabled before connecting. Test your HDMI device with a monitor first to confirm video and audio output, then connect to the Video Capture Card for recording.
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