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For a standard SDR H.264 stream, try encoding with -pix_fmt yuv420p and then verify the output. That is a practical compatibility fix, not a universal requirement for every YouTube Live codec or HDR workflow. First establish whether your video is SDR or HDR: YouTube’s SDR and HDR guidance calls for different color and encoding settings.
Check the video before changing the command
- Identify whether the intended output is SDR or HDR. YouTube’s live guidance recommends Rec. 709 and 8-bit for SDR. Its separate HDR instructions describe a 10-bit HEVC workflow with 4:2:0 settings. Don’t apply an SDR conversion blindly to HDR material; see YouTube’s live encoder guidance and HDR streaming instructions.
- Check the format the encoder actually produces. FFmpeg’s
-pix_fmtoption requests an output pixel format, but the encoder may not support the requested format. FFmpeg can warn and select a supported alternative; use the strict+prefix to make an unsupported format an error instead. See the FFmpeg documentation. - Confirm the ingest protocol and codec. YouTube’s live guidance covers RTMP/RTMPS with H.264, H.265 (HEVC), or AV1, while the HDR instructions also describe HLS ingestion. The right settings depend on the workflow you selected.
Convert SDR H.264 video to yuv420p
For a standard SDR H.264 output, this command is a useful starting point:
ffmpeg -i input -c:v libx264 -pix_fmt yuv420p -c:a aac -b:a 128k output.mp4It transcodes the input video with the H.264 encoder and requests the widely compatible yuv420p pixel format. It also encodes audio as AAC at 128 kb/s. This is a file-conversion example, not a complete live-stream command. Preserve or deliberately set the source’s dimensions, frame rate, and color characteristics; don’t assume the example is right for an HDR source or every encoder.
Place the format in a filter chain if needed
If you need to specify format within a video filter chain, FFmpeg also documents this form:
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#1 Best Overall
Guermok Video Capture Card, 4K USB3.0 HDMI to USB C, 1080P 60FPS & 2K 30FPS
- 【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
ffmpeg -i input -vf format=pix_fmts=yuv420p -c:v libx264 -c:a aac output.mp4The format filter requests a pixel format at that point in the filtergraph. FFmpeg documents the filter and examples in its filters reference. Choose either approach to fit your command; applying both is not necessary just to request yuv420p.
Keep the surrounding stream settings appropriate
Pixel format is only one part of stream compatibility. YouTube’s current live encoder guidance recommends progressive scan, square pixels, constant bitrate (CBR), a two-second keyframe frequency that does not exceed four seconds, frame rates up to 60 fps, and AAC or MP3 audio. For SDR it lists Rec. 709 and 8-bit. Check the current YouTube settings for the selected protocol before going live; codec support and recommendations can change.
Rank #2
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
Don’t substitute YouTube’s upload recommendations for live-ingest instructions. Its recommended upload encoding settings are for uploaded videos, not a specification for YouTube Live ingestion.
Verify the output and test the live stream
- Run the FFmpeg conversion and read its output for warnings about pixel format or encoder support. A requested format alone does not prove that the encoder selected it.
- Inspect or probe the resulting file or stream to confirm the codec and pixel format actually produced. If the format differs from the request, check encoder support and any conversion filters in the command.
- Test the stream before the intended broadcast, then check YouTube Live’s stream-health feedback and messages. YouTube recommends testing and monitoring stream health.
- If YouTube still rejects the stream, recheck codec, bit depth, frame rate, protocol, and whether the source is intentionally HDR. A pixel-format error can point to an incompatibility without proving pixel format is the only cause.
For HDR, use the separate workflow
Don’t convert HDR material to SDR yuv420p merely to silence a rejection unless you deliberately intend to produce SDR and have handled the color conversion. YouTube’s HDR live instructions specify an HEVC-based, 10-bit workflow with 4:2:0 settings and describe HLS ingestion. Preserve HDR by matching color primaries, transfer characteristics, and matrix to the source, and follow YouTube’s HDR instructions. The general live page’s SDR recommendations are not a replacement for those HDR requirements.
The Tool Desk
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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.
Common causes and fixes
| What you see | What to check | What to do |
|---|---|---|
| FFmpeg warns that the requested pixel format is unavailable or changes it | The selected encoder may not support the requested format. | Check encoder support and inspect the produced output. For SDR H.264, try -c:v libx264 -pix_fmt yuv420p; use strict -pix_fmt +yuv420p when you want FFmpeg to fail rather than choose a fallback. |
| YouTube rejects an SDR H.264 stream for pixel format | Confirm the actual output format, codec, and color settings rather than relying on the command’s requested values. | Transcode to yuv420p, verify the resulting stream, and review YouTube’s live settings. |
| An HDR stream fails after an SDR-oriented conversion | Check whether the intended workflow is HDR and whether the codec, bit depth, chroma settings, and color metadata match it. | Follow YouTube’s HEVC/10-bit HDR guidance and preserve source color characteristics, or make a deliberate SDR conversion. |
| The pixel-format change does not resolve the rejection | Other factors may be involved, including codec, bit depth, frame rate, or ingest protocol. | Check YouTube stream-health messages and test each stream-level setting against the guidance for the selected protocol. |
Or let it run in the cloud
If the goal is to keep a prerecorded video live on YouTube around the clock, StreamNeo is a cloud option: upload a recording or build a playlist, add your YouTube stream key, and go live. It plays uploaded videos, not a camera feed.
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Quick Recap
Best Value
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 #4
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.
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