Downsides to "Start live [commercial] detection when watching in-progress recording"?

[lights]

I happened across this setting when I went to DVR settings to manually refresh the guide data.*

Is this new? I don't think I ever noticed it before, but it's something I have always wanted. I often like to start a sporting event (mostly NFL games) about 1/3rd of the way through their scheduled time and play "catch up" by skipping the commercials. So this setting seems perfect for my use case.

But it's off by default so I'm writing here to ask if there's any downside to it.

I'm running the DVR server on a Sinology DS220+, if that matters.

*I had to refresh the guide data because the Bills-Steelers game was still showing up on the guide today, but it was moved to Monday due to weather, and the commercial detection setting just happen to be directly above the guide download options.

[Edwin_Perez]

@lights

But it's off by default so I'm writing here to ask if there's any downside to it.

The only downside is that it is not as accurate when ran after recording ends.

[babsonnexus]

There's what you might call "drift" once it gets going, and it gets really bad. You can read a about it here:

Commercial Detection for In-Process Recordings (Catch-up to live broadcast - especially useful for live sports/events)

@tmm1 I did a very detailed comparison of in-process commercial detection last night (during Sunday Night Football.) I recorded the show using both SageTV and Channels DVR, and ran in-process commercial detection for both. Both recorded OTA from the same Silicon Dust HDHR Connect Quatro (different tuners.) I then re-watched the show and manually checked all commercial markers. The detailed results are below. The quick summary is this: both performed about the same for the first 90 minutes. N…

I had to turn this feature off because of this after trying for a while.

[ChannelSurfer]

It’s frustrating that this still hasn’t been fixed. It’s not an issue with Comskip. It correctly detects the commercial positions. It’s an issue with playback of the in-process recording and Channels somehow not reading/calculating the current (or target) playback position. Please go vote for the linked post to hopefully get this fixed.

Commercial Detection for In-Process Recordings (Catch-up to live broadcast - especially useful for live sports/events)

In-progress scanning will always be less accurate than post-recording scans; this is a limitation of the Comskip program and not something that can be changed. You can always manually request that Channels re-scan for commercials after the recording finishes if you like.