[mythtv] New idea for commercial flagging...

[Ed Wildgoose]

Jason Flynn wrote:

> --- Ed Wildgoose <lists at wildgooses.com> wrote: 
>  
>
>>By "hashing" all frames in some sensible way 
>>    
>>
>
> This is a lot of data to process. What happens
>for thinks like snooker which look the "same"
>nearly all the while (like a big green table
>with a few small coloured dots)?
>  
>

Good thought about certain sports like snooker (or darts..?) where the 
camera is fixed and so the frame will be frequently similar.  It might 
still be handled by some heuristics which look for the hash clusters and 
ignore those which occur thousands of times and only focus on the ones 
which occur every 10-15 mins...

I could imagine repeated adverts might cause a hit as well, but in the 
same way our heuristics should pick those up as only occuring a few 
times and not as often as the real advert borders

I don't know about you, but the current commercial detection has an 
extremely low hitrate for me and it's not worth turning it on.  I don't 
watch the snooker, and in any, except for hardened snooker fans, it's 
hopefully a fringe case..?

As for processing power, agreed it's heavy.  Perhaps we can simplify the 
job by doing a first pass on less data?  Scan only a few rows from the 
middle of the picture, then rescan the likely candidate frames in more 
detail?  Perhaps this reduces the load a little..

> In the UK, this "banner" is also accompanied by
>am unusual character stream on p.888 teletext
>but obviously only applies to UK analogue.
>  
>

Nice idea.  Again though I am on DVB and so I don't think this is 
available in my case?  Good idea for a local detection signal though.

Ed W