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Estimate how much data your stream sends
For a constant bitrate running continuously, estimate outbound transfer with these decimal calculations:
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- GB per day: bitrate in Mbps × 10.8
- GB per 30-day month: bitrate in Mbps × 324
| Constant stream bitrate | Estimated transfer per day | Estimated transfer per 30-day month |
|---|---|---|
| 1 Mbps | 10.8 GB | 324 GB |
| 2 Mbps | 21.6 GB | 648 GB |
| 4 Mbps | 43.2 GB | 1,296 GB |
These are arithmetic estimates for uninterrupted 24/7 operation, not measurements or allowances published by a VPS provider. Actual metered use can differ due to protocol overhead, reconnects, other server traffic and the provider’s accounting method. Check how your provider measures outbound transfer and what happens if you reach the plan limit.
If the VPS sends one outbound feed to a platform’s ingest endpoint, the VPS-to-platform traffic is broadly similar whether a few or many viewers watch. That does not describe viewer delivery or a self-hosted distribution setup, which have separate traffic flows.
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Which settings reduce bandwidth?
Lower video bitrate carefully
Reduce the video bitrate in measured steps, then inspect the live image and platform health. A lower encoded bitrate means fewer bits sent from the VPS, but can make fine details harder to see. For a study stream, check small text, clock digits and any movement rather than judging only the overall scene.
OBS’s connection troubleshooting guide says a connection that cannot sustain its configured bitrate may drop frames. It suggests 75% of total upload speed as a generic starting point and notes that a lower bitrate reduces quality; that guidance is not a guaranteed VPS sizing rule. See the OBS connection troubleshooting guide.
Choose resolution and frame rate for the scene
Lower resolution or frame rate can make a lower bitrate practical, but may reduce text clarity or motion smoothness. A mostly static study scene may need less temporal detail than fast-moving footage, yet there is no established study-scene-specific optimum. Compare actual output at the viewing size your audience is likely to use.
YouTube’s current live-encoder guidance gives these H.264 recommendations: 4 Mbps for 240p–720p at 30 fps, 6 Mbps for 720p at 60 fps, 10 Mbps for 1080p at 30 fps and 12 Mbps for 1080p at 60 fps. These are platform recommendations for live ingestion, not mandatory minimums for a study stream. Consult YouTube’s encoder settings and bitrates and test the image at your chosen settings.
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Check codec compatibility before switching
Google’s current HLS ingestion documentation says HEVC generally provides 25% to 50% more data compression at the same video quality than H.264. This is a platform documentation claim, not a guaranteed saving for every scene or encoder. The guidance concerns HLS ingestion, so confirm that your destination, ingest protocol, encoder and playback workflow support HEVC before changing codecs. See YouTube HLS ingestion documentation.
Include audio in the total
Audio contributes to total stream bitrate. YouTube lists 128 Kbps for stereo audio. Twitch lists AAC-LC, with 96 Kbps recommended for maximum compatibility. If your study stream does not need audio, assess whether the track is necessary; if it does, use settings supported by the destination. Neither figure establishes a universally best setting for every platform or stream.
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Keep rate control and stream health in view
YouTube specifies constant bitrate (CBR) for RTMP/RTMPS live encoding, and Twitch also recommends CBR. Use the destination’s current guidance and monitor stream health: a lower target does not guarantee stability on every VPS route. Twitch’s recommendations also note that higher resolution requires more bitrate and higher frame rate takes more encoding power. See Twitch broadcasting guidelines.
Reduce bandwidth without making the stream hard to watch
- Record your baseline. Note video and audio bitrates, resolution, frame rate, codec, observed monthly transfer, encoder load and any dropped frames or reconnections.
- Estimate the transfer. Multiply the constant stream bitrate in Mbps by 324 for an approximate 30-day total in decimal GB. Account separately for other VPS traffic and allow headroom for metering differences.
- Change one setting at a time. Start with video bitrate. If the picture is still clear, test resolution or frame rate next. Consider a codec change only after confirming support across your destination and encoder.
- Test a representative stream. Include typical movement and audio, and watch both encoder load and platform stream health. YouTube advises testing with audio and movement similar to the actual stream and monitoring stream health in its live encoder guidance.
- Compare results. Check text and clock legibility, motion, dropped frames, reconnects, CPU use and observed outbound transfer. Restore a setting if the image becomes difficult to read or the stream becomes unstable.
- Verify the VPS plan. Check the included transfer, metering method and overage policy with your provider. Allowances and billing terms depend on the specific plan.
What viewers can select is a separate issue
The bitrate leaving your VPS is not the same as the range of playback qualities available to viewers. YouTube says it transcodes live streams into multiple output formats. Its help page explains: “YouTube will automatically transcode your live stream to create many different output formats so that all of your viewers across many devices and networks can watch.” Twitch transcoding is tiered and availability-dependent, according to the OBS explanation of Twitch transcoding. Check the destination and account rather than promising viewers selectable renditions.
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Common problems and fixes
- Dropped frames after lowering or changing settings: The configured bitrate may not be sustainable on the VPS-to-ingest route, or the encoder may be overloaded. Check stream health and encoder load, then test a lower bitrate or less demanding resolution/frame-rate combination.
- Small text or clock digits become unreadable: The bitrate may be too low for the selected resolution, or the resolution may not suit the scene. Raise the bitrate or adjust resolution and test again at the intended viewing size.
- Monthly transfer is higher than the estimate: The estimate covers a continuous stream only. Reconnects, protocol overhead, other VPS traffic and provider metering can change the total. Review provider usage records and ask how the plan accounts for outbound data.
- Codec settings are unavailable or the stream fails after a codec switch: Destination, ingest protocol, encoder or playback workflow may not support the combination. Confirm compatibility for the specific HLS or other ingestion path before using it.
- Viewers cannot select a lower quality: Viewer-side transcoding is controlled by the platform and may depend on platform or account availability. Do not assume a specific set of renditions based only on the VPS’s outgoing bitrate.
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