Because of the time-shifting nature of DVRs, networks are now interested in ratings during a time range rather than just the date and time that the show aired.
Most networks use Nielsen's Live Plus service to track ratings. Live Plus looks at who watched shows on their DVRs within different time frames. Generally, it tracks three major categories: Live-Plus-Same-Day, Live-Plus-Three and Live-Plus-Seven. Each one looks at a broader timeframe, so Live-Plus-Same-Day looks not only at who was watching when the show aired, but also who watched the show that day and the next. Live-Plus-Three and Live-Plus-Seven track who watched within three and seven days of the original airing, respectively. When Nielsen first rolled out its Live Plus service, network executives were uncertain, but it's become an industry standard.
There was a time, like in the last year, that yttv was adding commercials that we couldn't ff through. It was for an old series that we watch, maybe
The Middle. I had recorded the show. The original commercials were embedded in the recording. They still added commercials that my only recourse was to mute.
I haven't noticed that in a while. Granted they aren't dvr'd, but series on Peacock won't let you ff through the commercials and amazon says commercials are coming.
We are probably in a golden age of ff that won't exist if you don't pay up in the near future.