For most live streams, start with 2 B-frames when using NVENC H.264 or streaming to YouTube. Use 0–1 when latency and compatibility matter most, 0 as the conservative AMD starting point documented by OBS, and 3 only when following Quick Sync’s recording baseline. Do not treat 4 as a universal quality setting: B-frames can improve compression, but they can also add reordering delay and encoder complexity.
The number is a ceiling, not a promise that every encoded sequence will contain that many B-frames. Your encoder, codec, platform, bitrate, frame rate and latency target all matter.
What Max B-frames controls
Video encoders divide a stream into different frame types:
- I-frames (keyframes) are self-contained images.
- P-frames predict from earlier reference frames.
- B-frames predict from frames before and after them.
A simplified GOP might look like I B B P B B P. B-frames can describe predictable motion efficiently, preserving more detail at a fixed bitrate. However, Max B-frames means the maximum number of consecutive B-frames the encoder may choose; adaptive decisions can produce fewer.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →#1 Best Overall
- 【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.
This setting is separate from the keyframe interval, reference-frame count, lookahead, GOP size and B-frame as reference. YouTube’s recommendation of a two-second keyframe interval is not the same as “two B-frames.”
Quick recommendations
| Workflow | Starting value | Why |
|---|---|---|
| YouTube Live with supported H.264 settings | 2 | YouTube’s current guidance lists 2 B-frames and 1 reference frame. |
| NVENC H.264 live streaming | 2 | Matches OBS’s NVENC baseline and is a sensible general test. |
| Compatibility-first or interactive low-latency streaming | 0–1 | Limits frame reordering and reduces the number of variables while troubleshooting. |
| AMD hardware encoder | 0 | OBS’s documented recording baseline uses zero; this is a conservative starting point, not a rule for every Radeon system. |
| Intel Quick Sync | 3 for OBS’s recording baseline | OBS lists 3 for recording, but that value is not a universal live-platform requirement. |
| Local recording or VOD production | 2 or the encoder’s documented baseline | Latency is less important, so additional compression efficiency may be worth testing. |
Platform requirements take priority over generic settings. YouTube currently recommends H.264, HEVC or AV1 ingestion as applicable, CBR, a two-second keyframe interval (never more than four seconds), and 2 B-frames with 1 reference frame: YouTube’s live encoder settings. Do not automatically transfer that recommendation to Twitch, Kick, Facebook Live or another service without checking its current documentation.
How to find the control in OBS Studio
- Open OBS Studio and select Settings.
- Open Output.
- Change Output Mode to Advanced.
- Select the Streaming tab, not just Recording.
- Choose your encoder and codec.
- Find Max B-frames, B-frames or the encoder-specific equivalent.
Labels and available fields vary by OBS version, operating system, GPU generation, driver, codec and whether the encoder is a current or legacy implementation. Current OBS documentation describes encoder-specific controls rather than an identical form for every system: NVENC options and the standard output guide.
Choosing a value by encoder
NVIDIA NVENC
OBS lists 2 B-frames in its NVENC recording baseline. For ordinary H.264 streaming, 2 is the best first comparison. Increasing the maximum is not an automatic upgrade; at a generous bitrate, the visual difference may be negligible, while latency and analysis cost can rise.
Free tools Windows power users keep installed
One-click scans. No signup required.
For HEVC and AV1, OBS documents a separate B-frame as reference option. That option is not the same as increasing the maximum count and should only be enabled where the selected codec and encoder support it. OBS discusses it, along with lookahead controls, at its advanced NVENC documentation.
Rank #2
- 4K60 Capture: Record in cinematic quality with crisp detail and vivid colors
- HFR Support: Play and capture in 1440p120 or 1080p240
- HDR10 Support: Capture brilliant HDR content with tone mapping on Windows
- Cross-Platform Compatible: Works with PS5, Xbox Series X/S, Switch 2, and more
- Analog Audio In: Capture in-game chat or commentary with 3.5mm input
AMD AMF
OBS’s recording guide lists Max B-frames: 0 for AMD. Use 0 when you need a cautious, broadly compatible starting point or do not yet know how your specific GPU, driver and codec behave. This does not mean every AMD configuration must remain at zero; test 1 or 2 only after the baseline is stable.
Intel Quick Sync
OBS lists 3 B-frames for its Quick Sync recording baseline. Treat that as a recording-oriented reference, not a promise that every live ingest service or Intel generation should use 3.
x264
x264 tuning in OBS is normally driven by the CPU preset, bitrate and VBV behavior for streaming, or CRF for recording. The interface may not expose a matching B-frame field on every installation. Avoid pasting undocumented command-line overrides into custom options; use the controls your OBS build actually provides.
PC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWhen to use 0, 1, 2 or more
Choose 0
- You need the lowest practical encoding and playback latency.
- A platform, decoder or capture workflow reports compatibility problems.
- You are creating a simple troubleshooting control condition.
- Your AMD setup follows OBS’s conservative baseline.
Choose 1
Use 1 when you want a modest compression benefit but 2 introduces noticeable delay or questionable compatibility. It is a cautious compromise for moderately dynamic content.
Choose 2
Use 2 for normal NVENC H.264 streaming and for YouTube’s documented live settings, provided the rest of the configuration is stable.
Rank #3
- High-Quality Video Capture, 4K HDMI Capture Card Ready: Capture smooth and vibrant video with this 4K HDMI capture card, engineered for gamers and content creators who demand crisp 1080P 60FPS video quality. Whether you're streaming to Twitch or recording gameplay for YouTube, your footage will look professional and detailed
- Plug-and-Play USB Capture Card, No Drivers Needed: Designed as a USB capture card for streaming, this device works instantly out of the box, just plug into your PC or laptop and start capturing. Fully compatible with popular software like OBS Studio, Streamlabs, and XSplit, making setup quick and stress-free for beginners and pros alike
- Universal Compatibility PS5, Xbox, Switch & More: Stream or record gameplay from virtually any HDMI-enabled device including Nintendo Switch, PS5, Xbox Series X, DSLR cameras, and PCs. The video capture card for gaming supports seamless passthrough so you can play without lag while your audience watches every frame in real time
- Low-Latency Performance for Smooth Streaming: This capture card for streaming minimizes delay between gameplay and broadcast, so you get reliable, low-latency capture that works well for competitive gaming, live broadcasts, and podcast sessions. Suitable for those building their channel with high-quality, engaging content
- Compact & Portable Design for Content Creators: Lightweight and portable, this USB 3.0 capture card works well for creators who travel or switch gaming setups often. Throw it in your bag and stream or record wherever you are, at home, events, LAN parties, streaming or studio sessions
Choose 3 or more
Consider 3 or higher mainly for local recording, VOD production or a specifically verified encoder-and-platform combination. More B-frames cannot compensate for insufficient bitrate, an unstable upload, excessive resolution or an overloaded encoder.
Latency, quality and the “smoothness” misconception
B-frames require frame reordering. That can contribute to delay, especially alongside lookahead, larger GOP structures, complex reference schemes or small buffering windows. The amount is implementation-dependent; there is no reliable universal millisecond figure.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
NVIDIA’s encoder guidance distinguishes quality-oriented use from low-latency streaming and shows no B-frames in its cited low-latency example. That is encoder guidance rather than a mandatory OBS setting, and it varies with codec, GPU generation and integration: NVIDIA Video Encoder API Programming Guide.
B-frames generally affect compression efficiency and reordering, not frame pacing. Perceived smoothness is more often determined by stable rendering, consistent capture, adequate upload capacity, an appropriate frame rate and the viewer’s device.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test the setting instead of guessing
- Save or duplicate the current OBS profile.
- Write down encoder, codec, resolution, FPS, bitrate, keyframe interval, preset, lookahead and current B-frame value.
- Use the same game, route and scene for every run, including a fast camera-pan or particle-heavy section.
- Run a private, unlisted or platform test stream where available.
- Test 0, 2 and your encoder’s documented baseline if it differs.
- Change only the B-frame value between runs.
- Compare OBS statistics, CPU/GPU load, text and HUD clarity, motion artifacts, end-to-end delay and playback on another device or network.
Keep the lowest value that provides equivalent image quality without compatibility or latency problems. Keep bitrate and every other setting identical; otherwise a higher-quality result may simply have received more bandwidth.
Rank #4
- 【Full HD Video Capture Card】The capture card captures video and audio simultaneously, transmits the signal to your computer for preview or storage, and shares the video output to the screen. The capture card supports up to 4K30Hz input and Full HD 1080p60fps video capture, high-speed transmission without delay. Suitable for streaming media, video conferencing, game live streaming and other use scenarios
- 【3.5MM Microphone Input and Headphone Output】You can connect the capture card for streaming to a headphone connection with a 3.5.mm audio output port, and you can also connect the capture card to a 3.5mm microphone so you can easily stream sound and record your voice through the port. You can also use it to freely add external commentary while playing games. Note: Do not use a hub or USB extension cable, the USB port of the product must be connected to the USB 3.0 port of your computer for use
- 【HD 1080P 60fps Signal Loop-Out】The Hi-Speed USB 3.0 port of the capturadora de video para streaming provides 1080P60FPS video signal and excellent low-latency technology, allowing you to transmit live streams to Switch/Potplayer/VLC/Twitter/OBS more easily.The output port can provide up to 1080P60Hz output resolution, outputting a clean and clear image quality with no latency. image quality with no latency. Note: Maximum output is 1080P60Hz only
- 【Wide range of compatibility】This game capture card utilizes an advanced chip for compatibility with PC, PS5, PS4, X-box, Switch, DVD, DSLR, camcorder, webcam and more. Suitable for operating systems such as Windows, Linux and Ma-c OS. High-speed transmission without delay, record wonderful moments and enjoy good times. No need to install driver or external power supply, the device will automatically recognize as webcam when plugged in, detect the input and adjust the output automatically
- 【Our Service】After purchasing the switch capture card capturadora, you will receive: 1 x Capture Card, 1 x USB 3.0 Cable, 1 x User Manual. Service: 1. One year warranty service; 2. Professional technical assistance
Diagnose the actual source of stutter
Open OBS’s statistics panel while the problem occurs:
| Statistic or symptom | Likely area | Useful response |
|---|---|---|
| Dropped frames (network) | Upload route, bitrate, Wi‑Fi, ISP or ingest server | Check connection and server choice; do not start by changing B-frames. |
| Frames missed due to rendering lag | GPU saturation, uncapped game FPS, complex scenes or browser sources | Limit game FPS, simplify scenes or reduce output load. |
| Skipped frames due to encoding lag | Encoder preset, resolution, FPS or concurrent workloads | Use a faster preset, then reduce resolution or FPS if necessary. |
| Viewers buffer while OBS is clean | Viewer connection/device, platform delivery or missing transcoding | Check audience conditions and bitrate; broadcaster statistics alone cannot rule this out. |
| Macroblocking during rapid motion | Bitrate or scene complexity | Adjust bitrate, resolution, FPS or codec before assuming B-frames are the fix. |
OBS explains the difference between broadcaster-side dropped frames and viewer buffering in its stream-buffering troubleshooting guide. System load also depends on encoder, resolution, FPS and scene complexity, not just minimum hardware requirements: OBS system requirements.
If changing B-frames makes the stream worse
- Revert to 2 for NVENC/H.264 or 0 for a conservative AMD baseline.
- Temporarily disable lookahead.
- Disable B-frame-as-reference unless your codec and encoder documentation explicitly support it.
- For services that specify it, verify a two-second keyframe interval.
- If OBS reports encoding lag, lower the encoder preset before reducing output resolution; reduce resolution or FPS if overload remains.
- Check OBS statistics and the platform’s ingest warnings.
- Save the working profile before updating OBS or GPU drivers.
If the field is missing, Simple Output mode may still be active, the selected encoder or codec may not expose it, or the implementation may be legacy. Use the encoder’s defaults rather than forcing undocumented AMF, NVENC or FFmpeg parameters. Streaming and recording can use separate encoders, so changing the Recording tab does not necessarily change the stream; separate encoders can also consume additional resources, as described in OBS’s output guide.
The practical decision
Start at 2 for NVENC H.264 or YouTube, 0 for a conservative AMD baseline, and 0–1 when latency or compatibility is the priority. Test a documented Quick Sync value of 3 primarily in recording workflows. If the stream is not smooth, inspect network, rendering and encoding statistics before changing B-frames: this control is a compression and reordering trade-off, not a universal stutter cure.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
