I've been using the "All" method since I upgraded to .17, and I still occasionally see short false positives (9 or 11 seconds). I think the idea of a user setting for min/max commercial break length would be kind of handy.
This can occur even with ALL if the following are true:
* You're using software encoding
* You watch the recording before the post-recording mythcommflag job is
completed.
When using software encoding, Myth flags blank frames during the
recording process. Then when the recording finishes, it does a quick
routine to generate the commercial break list from the blank frames. Then
a job is queued up in the JobQueue to run mythcommflag which runs the full
scan on the video and uses the other detection info to get better
detection.
No software encoding -- I have 2 pvr250s and 1 pvr350. Also, I make it a point to never watch a show until after the JobQueue has completed. I'll keep an eye on it and see if I can find any patterns in the material that keeps getting skipped ...
Also, I see from the setup menu that it uses blank frame, scene change, and logo detection (and combinations) to find the breaks. Are any other methods used (and just not listed)? Specifically, I was thinking of volume level -- a lot of channels will ratchet up the volume during a
Currently the only other thing that ALL uses is aspect ratio change detection and letter/pillarbox detection. I plan on adding more detection methods, some related to sound, but I am sidetracked on a few other things right now. I'm trying some better edge logo detection code right now since the current code doesn't work as well for some logos. Once that is working, I plan on using part of that code to detect the rating symbols that stations in the U.S. have to display. Lots of other things could be used as well.
Good ideas. I'm in Canada, and a lot (most? I haven't kept track) of the stations up here put rating symbols in the top left-hand corner of the program. Maybe it'll come in handy for us too.
That being said, the commercial detection in MythTV is very good ... one of the [many] reasons I don't like watching regular TV any more!
Thanks.
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