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.
Describe the intended edit precisely
Imagine an authorised personal video where the desired extract begins at ten seconds, but the available seek point is at eight seconds. A stream-copy operation can preserve material between that earlier point and the requested start. The resulting beginning therefore needs checking rather than being assumed exact from the requested number. These times are hypothetical; the actual seek behaviour depends on the media, indexes and operation. A clip starting early is not evidence that the source has downloaded too slowly.
Identify the operation before changing options
FFmpeg documents that input seeking generally uses the closest earlier seek point. With accurate seeking during transcoding, the intervening material is decoded and discarded; stream copy preserves it. Stream copy and transcoding are therefore different choices for an edit requiring an exact start. Do not paste a command from another task without establishing option placement, selected streams and output requirements. Copying compressed packets can avoid re-encoding, but that advantage does not promise arbitrary frame-accurate boundaries.
Verify the resulting passage
Work on a separate output file and keep the original. Check the first picture, first audible words, final passage and synchronization in an actual supported player. Use the relevant timestamps rather than comparing filenames alone. If an exact edit is required, select a documented workflow that can decode and process the intended boundary, then assess the resulting quality and track selection. This article explains a decision from FFmpeg documentation; it does not claim a command was run, validate every container, or offer a way to alter protected recordings.