An XMLTV guide contains programme metadata such as channel identifiers, titles and scheduled times. It does not replace the video playlist. In a compatible player, add the guide through the EPG settings and then match its channel identifiers to the channels already loaded.
Use the guide field, not the video field
A playlist URL belongs in a playlist import control; an XMLTV URL belongs in the guide configuration. Pasting a guide into a media playback box may simply produce an unsupported-file error. Read the app’s labels because the location of EPG settings varies.
Allow the first guide import time
A guide covering many channels can be larger than expected. Leave the player open while it downloads and processes the data. If there is a last-updated timestamp, record it so you can distinguish old cached listings from a new import.
Verify a small sample
Compare the current and next programmes on two or three channels whose region you recognise. If all times are displaced equally, investigate time settings. If only one channel is wrong, investigate its mapping rather than changing the global offset for every channel.