What is Refresh Rate?
Refresh rate is the number of times per second that a display can update its image, measured in hertz. It is distinct from frame rate, which counts images generated or stored each second.
How Refresh Rate works
A display refreshes by scanning or updating its panel on a repeating cadence, while a renderer or video source supplies frames on its own cadence. If those timings do not align, frames may be repeated, presented for uneven intervals, or switched during scanout; synchronization and variable-refresh mechanisms manage that relationship. Refresh rate belongs at the final presentation stage, after decode, and must be considered alongside frame pacing, pixel response, and display latency.
Key facts
- 1When frame cadence does not divide evenly into a fixed refresh cadence, repeated frames can follow an uneven pattern and produce judder even though no encoded frames are missing.
- 2Variable-refresh displays adjust refresh timing within a supported operating range to follow frame delivery, reducing tearing and pacing artifacts without inventing new source frames.
- 3Refresh rate and pixel response time are independent. A panel may accept frequent updates yet show smearing if its pixels cannot transition between levels quickly enough.
When Refresh Rate matters
Match animation or playback behavior to display timing when minimizing judder, tearing, or redundant rendering work. A high refresh rate cannot create motion detail absent from a lower-frame-rate source.
Common use cases for video
These examples cover video broadly, not specifically Refresh Rate.
- Preparing uploaded video for web, mobile, connected-TV, social, or editorial playback.
- Creating clips, thumbnails, captions, alternate aspect ratios, and adaptive renditions.
- Normalizing camera, screen-recording, and user-generated files into predictable outputs.
Working with video
This guidance covers video broadly, not just Refresh Rate.
A demuxer separates tracks from the container, decoders turn compressed streams into frames or samples, and filters apply spatial or temporal changes. Encoders compress the transformed tracks before a muxer writes the chosen output container.
Video compatibility is the product of codec, container, profile, level, frame rate, color, audio, and subtitles. Validate the complete output on target devices because a playable file on one decoder may fail or look different on another.
What you gain
- Standardized derivatives make diverse source files playable on target devices.
- A retained master can feed many resolutions, aspect ratios, codecs, and channels.
- Automated inspection and transformation make large upload volumes consistent.
What it costs
- More efficient codecs can lower bitrate at similar quality but usually cost more compute and may have narrower support.
- Higher resolutions and frame rates preserve more detail and motion while increasing processing and delivery requirements.
- Fast encoding settings improve throughput but can produce larger files or lower quality than slower analysis.
Before production
- 1Inspect codec, container, dimensions, frame rate, color, audio, and subtitle tracks.
- 2Test visual quality and playback support across the slowest and oldest target devices.
- 3Preserve a suitable master before applying lossy, destructive, or delivery-specific changes.