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For OTA ATSC TV (north America), if I have schedules direct up and running, do I disable the OTA grabber to avoid conflicts? Or can they live together.
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While you can have them both enabled (just set the priority for schedules direct) not sure you would want to. The data from the OTA is usually pretty generic, only covers 24 hours and you're asking your system to run scans (use your tuners) when idle or on boot up.
If the SD is running and stable for you - I would disable the OTA grabber.
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I'm thinking for sporting events that run over time. Don't want to miss the last minutes of NBA playoff game
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It is unlikely that local OTA guide info would be updated for live sporting events. I used to work in a tv station and that information is generically fed into the transmitter - it is not usually setup as a dynamic information stream that gets updated by anyone. In fact, it is usually just pulled from a log that is created days or weeks earlier.
If you're fortunate enough to have a local station that is having someone update that info - you could set the OTA grabber to have the higher priority and test it out. I'm not sure if tvheadend will pull in the live stream of the epg data and update any recording timer while tuned to the channel. Let us know how it goes!
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Schedules Direct offers this information for live sporting events for MLB, NFL, NHL and NBA. If you query the guide event via JSON, it will tell you if the sporting event is still in progress, as well as give you the current score for finished and in-progress games for those leagues.
Unfortunately, I do not know of any grabber or application that makes use of this information, especially for Tvheadend (as I doubt Tvheadend has any way to make sense of this additional information).
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The issue would be the triggering part. I suppose we could ask the folks at tvheadend to add a trigger for the grabber when recording "live" events right before the program is going to end. That way if it is getting extended it would update the timer accordingly. Maybe something to post over on their forum.