For most programmes that are pre-recorded, we create the subtitles in advance. A technician uses the audio and picture to sync them up with what’s happening on screen. 

For a programme that’s broadcast live (like the news or Strictly Come Dancing) or close to live (like Have I Got News for You or The Graham Norton Show), subtitles will be generated as it's being broadcast. This means you’ll often notice a delay when watching these programmes, be it live or on demand. We can sometimes replace live subtitles a short time after the broadcast, although this isn't always available.

If you spot a programme with out-of-sync subtitles, check our known issues page to see if we already know about it. If not, please get in touch and we’ll check.