Identify the two measurements
A source can contain a particular number of frames per second while a connected display updates at another rate. EBU’s production-format reference identifies frame rates as part of source image formats. Display-output settings describe another stage in the chain. Record both values when available rather than reading the television’s input information and presenting it as proof of the programme’s original frame rate.
Understand repeated presentation
When output and source rates differ, the playback chain needs a way to present source pictures across display updates. That can involve repeating pictures or additional processing. A 60 Hz input indication does not establish that a 25-frame source suddenly contains 60 distinct captured moments each second. This distinction matters when comparing motion judder with network buffering: uninterrupted delivery can still show an uneven presentation cadence.
Treat matching features as model-specific controls
Some playback devices offer content-matching options. Apple documents matching frame rate on Apple TV and warns that format changes can involve a display transition. Other devices and applications use different controls or may not provide the same function. Use the exact product documentation before changing output settings, and do not assume a control on one platform is a universal requirement for all televisions.
Compare motion with a stable test
Choose an authorised scene with steady movement and observe one output change at a time. Note whether the problem is repeated judder, a brief format-switch interruption or a full stall with a loading indicator. Avoid selecting an unsupported output mode simply because its number is higher. A useful result relates the source, device output and display behaviour rather than choosing a single rate to describe the entire chain.
Questions, answered
Does 120 Hz output turn a 25 fps programme into 120 fps original footage?
No. Display updates and original source frames are different measurements. Repetition or processing cannot establish that additional moments were captured in the source.