Not necessarily so.. Depending on reception quality (I know that my channel 3 comes in worse than most), there may be more or less latency in blank frame detection. Ditto to positions that are set by user when flagging.
On Thu, 3 Mar 2005, Brad Templeton wrote: > On Thu, Mar 03, 2005 at 08:53:01AM -0800, Chris Petersen wrote: > > This is pretty standard -- shows are edited such that there are > > commercial breaks in certain places. However, it does NOT account for > > the commercial breaks being the same length in each region (remember, > > commercials are regional things). > > Over time this is solved once you have enough people watching your > exact profile of show. That's easy for all the cable networks, > everybody watches exactly the same show on Discovery Channel (even the > same east and west.) I think it's also true for prime time network > programming, they are all on the same tight schedule. If not, you need > to find other people in your town, which will eventually happen. > > If you are tired of waiting for this, there are ways to make this work. > > You start by building a signature map for the program based on detection > of scene transitions (key frames etc.) and all the other transitions the > commercial flagger uses. These transitions form a fingerprint for > sections of the show. Ie. this section had a 20 second scene, followed > by a 31.5 second scene, and a 8.3 second scene etc. Such fingerprints > would be unique. > > You can also, when there is closed captioning, and it's coming from the > network feed, just not the exact frames of the exact pieces of text. > Highly precise. > > Anyway, now you record user actions not just based on the NTP time, > but relative to these points. Ie. "The user hit fast forward 9.3 > seconds after the frame with the closed caption text 'foo'". > > Now you have something that works everywhere. > > > > > Also, don't forget that some people record before/after shows, and myth > > is never 100% accurate in the time you give it (I'm set to record an > > Actually, my myth is _always_ 100% accurate on the time. It is the > networks that are off. If you run NTP and are live on the internet, > you will always have very very good time. > >
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