Media diagnostics · Primary-source explanation; no UK IPTV implementation or account test. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Draw the two paths mentally
A source can feed a television while a capture device produces a separate recorded output. Seeing the HDR image on the television and reviewing an SDR recording are not the same observation. Record which device, software and file format produced the captured result. Do not assume that the recording is a neutral screenshot of everything the television displayed.
Read the manufacturer’s processing scope
Elgato’s current support article distinguishes devices with onboard HDR-to-SDR tone mapping from devices without it. It explains that a capture path can convert incoming HDR for an SDR result, and that differences from the HDR source can remain. Use the exact device’s documentation; the presence of a capture socket or an HDR passthrough label does not establish identical capture and display processing.
Use a controlled comparison
For an authorised personal sample, note whether the capture output is intended to be HDR or SDR, then inspect highlights, shadows and colour using an appropriate playback path. If the television looks correct but the SDR capture appears different, preserve that branch-specific result. Avoid changing the source, capture mode and display processing simultaneously, because the resulting difference becomes harder to attribute.
Keep evidence claims narrow
A captured file is useful evidence about its own path, not automatic proof of a service’s original resolution, every viewer’s display or a universal tone-mapping result. The source article’s model list should be rechecked before a purchase or configuration decision. This explanation does not report an Elgato or UK IPTV test, and it makes no claim that capture bypasses protected-output restrictions.