Mark Edwards wrote:
I have noticed that more and more shows are shown in letterbox (in 4:3
format) and have black bars on the top and botton during the 
show but switch to full 4:3 during commercials. Would it be 
possible to add another commercial detection scheme that 
looks for the letterbox format with the black bars, and if 
present goes back to the beginning of the show and flags 
commercials when the black bars go away?
    

An even simpler option for DVB users (at least in the UK) would be to detect
the "Aspect ratio changed" message that we get at the start and end of
adverts. Would be great because the other methods are fairly unreliable
here.

Mark
  

That was another thought I had a few months ago but had forgot about it. I played with an HDTV recording and the fps of the stream change from 24 to 30 when it switches from the show to a recording.

- James
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