Frame rate describes media frames per second; refresh rate describes display updates per second. A higher display rate does not prove the source contains that many distinct frames. Keep the source’s fps separate from the output’s Hz when diagnosing motion.
Record where each value came from
Use a player’s documented media-information screen for source frame rate if it is shown. Use the display or output settings for refresh rate. A channel name, panel marketing term or game mode does not supply both. Mark unknown values as unknown rather than assuming that a 120 Hz television receives 120 fps programmes.
Sony’s official explanation distinguishes fps from Hz and describes VRR for applicable equipment. That supports the conceptual distinction; it does not establish that a particular television, player or media source uses variable refresh. A gaming feature is not a universal solution for television-stream motion.
Work through two idealised cadence examples
Imagine a fictional 24 fps presentation sent through an idealised 120 Hz output with no frame interpolation. Each media frame can occupy five display updates because 120÷24=5. The display is refreshing 120 times each second while the presentation still supplies 24 original frames. This is arithmetic, not a test of a particular television.
Now compare an idealised 60 Hz output for that same 24 fps presentation.60÷24=2.5, so equal whole-number repetition does not divide evenly. The device needs some supported cadence or conversion behaviour. This simple example explains why motion can differ without any change in source resolution or network speed. Actual fractional rates, processing and output choices need model-specific documentation.
| Fictional media/output | Simple ratio | What the ratio shows |
|---|---|---|
| 24 fps / 120 Hz | Five display updates per frame. | High display refresh does not create extra source frames. |
| 30 fps / 60 Hz | Two display updates per frame. | The numbers can differ while cadence divides evenly. |
| 24 fps / 60 Hz | 2.5 updates per frame. | Uniform whole-frame repetition does not divide evenly. |
Keep interlacing and processing separate
A source labelled 1080i includes a scan-format distinction as well as a line count. Do not infer progressive frame cadence from the number alone. Use the interlaced/progressive reference when the player exposes that information. Motion smoothing or interpolation is another display function; it should not be confused with original captured frames.
If the exact streamer documents content matching, compare it through that manufacturer’s procedure. Keep the original setting and change one option. A brief output-format transition and ongoing uneven motion are different observations. Do not copy Apple TV settings into a Roku, Tizen or other platform interface.
Use the distinction in a motion report
Describe whether motion is regularly uneven, blurred, blocky or interrupted. Include source fps if visible, output Hz, device/player versions and any supported matching comparison. Smooth video arriving later than another feed is a latency question rather than an fps/Hz mismatch by itself.
A useful result can be a known source/output pair and a repeatable setting effect. It does not prove a defect or guarantee that every programme will look identical. Ask the hardware or player publisher about the supported cadence when values differ. No frame rate, display mode or physical panel was measured for this reference.