[mythtv-users] mythcommflag logo detection does not work

[Michael T. Dean]

On 12/24/2013 12:21 PM, Karl Newman wrote:
> Sorry to bust your theory, Brian... ;-) Daryl actually said that the 
> recordings from the PVR-150 were the ones that were ~40%ish.

Oops. I should have read your post before saying the same thing...

> Which matches with my experience--I've been using the PVR-500 as long 
> as I've had myth and the thing which changed and broke commflagging 
> for me (I'd guess I'm also at about the 40%ish mark) was the version 
> change from 0.24 to 0.25. At one point, I'd guess around mythtv 
> version 0.22, Comcast switched to all digital and I had to start using 
> set top boxes, but commflagging still worked great for me after that 
> transition. However, I'd agree that it's most likely due to changes in 
> ffmpeg. Possibly the changes made to accommodate the new encodings 
> from OTA, QAM and CableCard made things worse for the PVR-XXX encoding.

FWIW, I don't see how ffmpeg could be to blame since the commercial 
detection basically just looks at a series of images.

I really think it's how the broadcaster and re-broadcasters are 
"chopping things up".  For example, the show comes from the networks 
with some pre-inserted national ads, and some spaces for adding in local 
ads.  Many times, those ads have very-different-from-before gaps (much 
smaller and/or missing) and transitions and such.  I think this tends to 
have the biggest effect.  As I mentioned, I have varying results from 
different channels on my OTA system, and to some extent, even, different 
shows on a given channel.

Mike