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.
Separate input dimensions and output dimensions
A media export can choose a larger output frame than the input. Android’s Media3 Presentation documentation explicitly separates input-pixel mapping, output resolution, fitting and stretching. These are operations performed by an application. A larger result should not be described as evidence that the original recording was natively captured at that output size.
Work through the pixel arithmetic
A 1920 × 1080 frame has 2,073,600 pixel positions. A 3840 × 2160 frame has 8,294,400, exactly four times as many positions. That comparison describes the grids. It does not prove that scaling recovered four times as much original scene information. The processing method determines how the larger grid is filled, and the source’s actual content remains a separate fact.
Inspect the whole intended result
If an export is required for a particular workflow, compare framing, edge detail, text and aspect ratio using authorised material. Increasing dimensions while stretching the wrong geometry can make a larger but distorted result. A higher output number also does not establish HDR, a different codec or a higher-quality audio track. Keep each property independently labelled.
Use precise language in support and publishing
Describe the file as scaled to the output size when that is what happened. Do not promise a native 4K programme from a player’s output mode or an export setting alone. Preserve the original for comparison. This example provides original grid arithmetic around a documented presentation operation; it reports no UK IPTV source-resolution verification or completed upscale test.