Why only 75% of my upload speed?

Streams share the connection with game traffic, voice chat, alerts and everything else on the network, and upload speeds fluctuate. Capping the stream at ~75% of measured upload prevents dropped frames when the connection dips.

Is AV1 or HEVC always better than H.264?

At the same bitrate, yes — but the platform has to accept it. Twitch's standard ingest is H.264 at 6,000 kbps, with HEVC/AV1 via Enhanced Broadcasting; YouTube accepts all three. For recording, AV1/HEVC roughly halves file size, as long as your editor handles it.

CBR for streaming but CQP for recording — why?

Streaming platforms want a steady, predictable bitrate (CBR). Local recording has no network constraint, so constant-quality modes spend bits only where the picture needs them — better quality per gigabyte.

Streaming Bitrate Calculator

The right bitrate and encoder settings for Twitch, YouTube or Kick — x264, NVENC, HEVC and AV1 compared, with a quality verdict and suggested OBS settings.

PlatformStreaming SoftwareResolutionAspect RatioFrame RateEncoderContent MotionYour Upload Speed (Mbps)

Output frame: 1920 × 1080 at 60 fps

Recommended bitrate for 1920×1080@60 on Twitch with NVIDIA NVENC H.264

6,000 kbps

Workable — fine for most content, may soften in heavy motion.

Limited by Twitch's ingest cap. 6,000 kbps standard H.264 ingest; Enhanced Broadcasting allows HEVC/AV1 at higher rates.

Suggested OBS Studio Settings

Rate Control: CBR at 6,000 kbps
Keyframe Interval: 2 seconds
Encoder: NVIDIA NVENC H.264 — preset: P6 (Quality), Look-ahead + Psycho Visual Tuning on
Profile: High, B-frames: 2
Output: 1920×1080 @ 60 fps
Audio: AAC 160 kbps

Settings → Output → Streaming (set Output Mode to Advanced).

How the verdict works: quality is estimated as effective bits per pixel — bitrate ÷ (width × height × fps) — scaled by encoder efficiency (HEVC ≈ 30–40% and AV1 ≈ 40–50% more efficient than H.264) and content motion. Around 0.07 effective bpp looks clean for typical content; below ~0.045 blocking becomes visible in motion. Platform caps, software notes and encoder efficiencies are curated values, refreshed as platforms and hardware change.

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What Is the Streaming Bitrate Calculator?

The Streaming Bitrate Calculator recommends a bitrate and full encoder settings for live streaming or local recording. Pick your platform (Twitch, YouTube Live, Kick, Facebook or custom RTMP), resolution and frame rate, encoder — x264 on the CPU, NVIDIA NVENC in H.264, HEVC or AV1 flavors, AMD AMF, Intel QuickSync/Arc, or FFmpeg's x265 and SVT-AV1 — and how much motion your content has. It computes the effective bits-per-pixel your stream would deliver, adjusted for each encoder's efficiency (HEVC is roughly 30–40% more efficient than H.264, AV1 40–50%), checks it against the platform's ingest cap and a 75% safety share of your upload speed, and gives a verdict: crisp, workable, or starved — with a concrete fallback resolution when the math doesn't work. A settings panel spells out what to type into OBS: rate control, keyframe interval, encoder preset, profile and audio bitrate. Recording mode switches the advice to constant-quality (CQP/CRF) with realistic file-size expectations.

How It Works

Choose Live Stream or Local Recording, set platform, resolution, encoder, motion level and your upload speed. The recommended bitrate, verdict and OBS settings update live.

When to Use It

Use it when setting up OBS for the first time, moving from x264 to NVENC or AV1, diagnosing a blocky stream, checking whether your upload can handle 1080p60, or picking recording settings that won't eat your drive.

Frequently Asked Questions

Why only 75% of my upload speed?: Streams share the connection with game traffic, voice chat, alerts and everything else on the network, and upload speeds fluctuate. Capping the stream at ~75% of measured upload prevents dropped frames when the connection dips.
Is AV1 or HEVC always better than H.264?: At the same bitrate, yes — but the platform has to accept it. Twitch's standard ingest is H.264 at 6,000 kbps, with HEVC/AV1 via Enhanced Broadcasting; YouTube accepts all three. For recording, AV1/HEVC roughly halves file size, as long as your editor handles it.
CBR for streaming but CQP for recording — why?: Streaming platforms want a steady, predictable bitrate (CBR). Local recording has no network constraint, so constant-quality modes spend bits only where the picture needs them — better quality per gigabyte.

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