HandBrake · Primary-source explanation; examples are illustrative. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Inspect the source chapter structure
HandBrake chapter documentation describes detected markers in the Chapters tab, with automatically generated names which can be changed. It documents copying those markers into supported output containers. First inspect whether the permitted source has the expected divisions. Changing a chapter name answers a labelling question; it is different from choosing the start and end of an encoded range or analysing the picture for new scene boundaries.
Match the names to actual positions
For an original example, a permitted training recording has three existing markers which divide an introduction, a practical demonstration and a recap. Play around each division before assigning those names. If a marker sits in the middle of the demonstration, a more attractive label does not move it to the beginning. Keep a record of the source positions and review the output chapter navigation rather than assuming that a successful encode guarantees the intended structure.
Check the import format for the interface
The documentation describes chapter list import and export with platform differences, so use a template exported from the relevant installed interface instead of guessing a universal file layout. Confirm the names and navigation after importing and after encoding. Its documented workflow also does not create markers where none were present in the source; use an appropriate authoring tool if new divisions are required. Retain the original media and the naming list so that later revisions can be checked against the same programme edition.