Bitrate explained.
Bitrate is the amount of data transmitted per second of video, measured in bits per second (bps). Higher bitrate means more data per frame, which means more detail, cleaner motion, fewer compression artefacts. But higher bitrate also demands more bandwidth from both the broadcaster and every viewer. The art of professional broadcasting is finding the lowest bitrate that still looks clean at the viewing resolution. CBA targets 4-6 Mbps for 1080p30 standard streaming, 8-12 Mbps for 1080p60 (sports, esports), 25-50 Mbps for 4K delivery, and 3-5 Mbps for low-latency SRT contribution feeds where bandwidth efficiency matters more than peak quality. Bitrate interacts with codec efficiency: H.264 at 5 Mbps looks worse than H.265 (HEVC) at 3 Mbps. It interacts with frame rate: 60fps needs roughly 50% more bitrate than 30fps for the same perceived quality. And it interacts with the encoder strategy (see CBR vs VBR) because constant bitrate behaves differently than variable bitrate under motion.
What it means in live production.
Bitrate is the amount of data processed per second in a video stream, measured in megabits per second (Mbps) or kilobits per second (kbps). It is the single most important setting that determines the visual quality of your live stream. higher bitrate means more data per frame, which means more detail and fewer compression artefacts.
In practical terms, bitrate is the budget your encoder has for describing each frame of video. A 1080p60 stream at 8 Mbps has more data available per frame than the same resolution at 3 Mbps. The higher bitrate version will show sharper text, smoother gradients, and fewer blocky artefacts during fast motion. The lower bitrate version saves bandwidth but sacrifices detail.
For live event streaming, choosing the right bitrate is a balance between quality and deliverability. A corporate conference streamed at 15 Mbps will look pristine but most viewers' internet connections cannot sustain that download speed. The same event at 5 Mbps delivers excellent quality that nearly all viewers can receive without buffering.
At Creative Broadcast Agency, our standard bitrate targets are:
- 1080p60 (esports, fast motion): 6-10 Mbps in H.264, 4-6 Mbps in HEVC - 1080p30 (conferences, presentations): 4-6 Mbps in H.264, 3-4 Mbps in HEVC - 720p30 (backup tier, mobile viewers): 2-3 Mbps in H.264 - SRT contribution feeds: 15-30 Mbps for maximum quality between venues and the MCR
The codec matters as much as the bitrate. HEVC (H.265) achieves roughly the same visual quality as H.264 at 40-50% lower bitrate. Newer codecs like AV1 improve further but are not yet widely supported by hardware encoding equipment. We choose codecs based on platform compatibility and encoder capability.
Bitrate can be configured as constant (CBR) or variable (VBR). CBR vs VBR is a separate decision. CBR maintains a fixed data rate regardless of scene complexity, while VBR allocates more bits to complex scenes and fewer to simple ones. For live streaming, CBR is generally preferred because it produces predictable bandwidth consumption, which is critical for SRT contribution and CDN delivery.
Adaptive bitrate streaming (ABR) extends this further by offering multiple bitrate tiers to viewers. Each viewer's device selects the highest bitrate their connection can sustain, switching dynamically as conditions change. This is why we encode multiple bitrate variants simultaneously. typically 4-6 tiers from 480p to 1080p60.Questions we get from buyers before they book
What bitrate should I stream at for a corporate event?
For 1080p30 to YouTube or LinkedIn, 5-6 Mbps in H.264 is the sweet spot. It delivers clean, professional quality without requiring exceptional viewer bandwidth. For internal webcasts where you control the network, you can push to 8-10 Mbps for maximum quality.
Does higher bitrate always mean better quality?
Up to a point. Beyond a certain threshold, increasing bitrate produces diminishing returns. the encoder has already captured all the detail the resolution can show. For 1080p60, returns diminish above 12-15 Mbps in H.264. Spending data beyond that is wasted bandwidth.
Why does my stream look worse than my local recording?
Your local recording likely uses a higher bitrate and less aggressive codec (ProRes, DNxHR, or high-bitrate H.265). The stream uses a lower bitrate optimised for internet delivery. This is why we always record locally at maximum quality and stream at a separate, lower bitrate simultaneously.
How does bitrate affect buffering for viewers?
If your stream bitrate exceeds a viewer's download speed, they will buffer. A 10 Mbps stream requires the viewer to sustain at least 10 Mbps download continuously. This is why adaptive bitrate exists. it drops to a lower tier if the viewer's connection cannot keep up.
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