A sign language interpreter in the corner of the screen isn't a nice-to-have. For deaf viewers, it's the entire programme.
Here's the thing: the BBC and other broadcasters air signed versions of many programmes. An IPTV Reseller Panel that aggressively crops or compresses video can cut off the interpreter entirely. For British IPTV deaf users, that makes the programme unwatchable.
I've watched a reseller add signed programming to his lineup. Deaf users complained that the interpreter was blurry or partially cut off. His IPTV Reseller Panel was applying the same cropping to signed content as to regular content.
What actually works is an IPTV Reseller Panel with a "preserve safe zone" transcoding setting. A good British IPTV panel also lets you mark signed channels so they bypass aggressive cropping rules.
Real scenario: A British IPTV reseller in Birmingham tested his IPTV Reseller Panel 's signed content handling by playing five minutes of a signed news bulletin. The interpreter was clear and fully visible. He asked his provider about their transcoding settings. They had a dedicated profile for signed content. His deaf users became his most loyal customer segment.
That said, don't assume "signed" means the same as regular. Signed programmes often have lower video quality to begin with. Your British IPTV panel should never make that worse.
Honestly, find a signed programme on BBC iPlayer first so you know what it should look like. Then compare the same programme through your panel. If the interpreter is blurry or cropped, your panel is failing deaf users.