A subtle update has just taken place on Freeview and some users might want to take note. This popular free-to-view platform has started to show programmes using a new format and it could leave some with older televisions facing the nightmare of staring at a totally blank screen.

The recent change allows channels to use new audio and visual technology called MPEG-4 AVC video codec and HE-AAC audio codec. It all sounds very complicated but it's benefits are simple.

This updated broadcast standard basically uses much less bandwidth whilst offering no loss in picture or sound quality.

That means there is more space for other services to launch on the platform - something that could be vital - and more cost effective - for the future of Freeview.

The first channel to make the switch is That’s TV 3 (Ch 71), with this service only showing content in this updated format.

It means if you head to channel 71 and your TV goes blank, you know that it's not future-proofed against any other upcoming changes.

Luckily, it’s expected that only a small number of homes will be affected by this update, with most modern TVs fully compatible with the new codec standard.

The team at RXTV says that broadcasters hope the change goes unnoticed and hotlines aren’t flooded with complaints.

If only a tiny minority of users have issues, more channels could be switched over to this updated technology in the future - that's why it's a good idea to check channel 71 now.

With fewer people now watching TV via terrestrial signals, this update could help cut costs and keep Freeview viable.

What are the alternatives to Freeview?

Millions of homes have already ditched their aerial or dish and switched to streaming. Those who don't mind spending money each month can subscribe to devices such as Sky Stream or Sky Glass, which offer instant access to channels via the web. 

Anyone who would rather keep their wallet in their pocket might fancy Freely instead.

This service now comes built into a swathe of new TVs and offers access to live and on demand shows and movies via a broadband connection.

Freely is actually owned by the same team behind Freeview, and it has its advantages, such as getting regular updates, new features, and not being affected by the weather. Want to know more? Check out our full Freely TV guide.