ERD solves all of this in one dashboard.
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Some advanced versions allow you to import an XMLTV file alongside your M3U. The editor highlights which channels are missing EPG IDs, allowing you to manually map "Channel Name" to tvg-id="cnn.us" . Erd Iptv M3u Editor
: Group channels by category, fix logos, and assign Electronic Program Guide (EPG) data. ERD solves all of this in one dashboard