[mythtv] Test (crude) patch for commercial skipping

[matt.jarvis at philips.com]

On terrestrial UK television, there is a small black and white square 
which appears in the top right hand corner of the frame briefly before an 
advertisement, called a cue dot in tv production speak. This is used to 
signal to certain equipment and personnel in the production chain that an 
advertisement is approaching in 30 seconds I believe. There used to be 
VCR's on the market which could detect the cue dot and pause. I don't know 
if this helps, or even if it is used in digital broadcasting, I'll check 
when watching TV tonight and see if it used on Sky's satellite service. 
Detecting this dot in the frame would be a much more reliable method than 
using blank frames, if it used everywhere, as it is always in the same 
position and always contains the same number of pixels etc. since it is 
machine generated and used to automate other equipment.


Matt Jarvis

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