video sync

jameswilson · Post by **jameswilson** » Mon Aug 01, 2005 4:07 pm

Is it possible to ask the video card ,bttv, if a video sync is present on a paticular input?

James

shuckc · Post by **shuckc** » Sun Sep 11, 2005 11:58 pm

The linux app "TV Time" seams to do video detect - at least on my tvcard. Based on the philips chipset. This si how the automatic channel scan system works.

Chris

Blazer · Post by **Blazer** » Mon Sep 12, 2005 3:17 am

Speaking of this, it would probably be nice if ZM had the option to alarm if the video sync/signal was lost on an input (camera malfuctioned or someone cut the wire). Perhaps even detection of the camera being covered up (all black/grey pixels) would be possible?

jameswilson · Post by **jameswilson** » Mon Sep 12, 2005 7:36 am

thats where i was going. I assumed that i could detect sync and if so would know when it was lost

James

Post by **zoneminder** » Tue Sep 13, 2005 12:54 pm

Detection of loss of signal is on the to-do list. It's pretty simple to do, the only thing to decide is whether it's just another motion detect event or whether it fits into a class by itself and so would be triggered even if in one of the recording modes.

Phil

jameswilson · Post by **jameswilson** » Tue Sep 13, 2005 3:21 pm

i think it should be a seperate event and nothing to do with motion detect. It would be grate if it could send an email on loss, but i suppose it doesnt matter how it does it as long as it logs video loss and restore and can send an event if required.

James

Post by **cordel** » Tue Sep 13, 2005 5:38 pm

I'd have to agree with James.

gregmac · Post by **gregmac** » Tue Sep 20, 2005 10:51 pm

It definately needs to be seperate from motion detection. If video is lost, it should be possible to send an email specifically saying so.

For example, I would set this up to send a message to my cell phone. If I got that message, I'd go online, see what the video was leading up to the event (ie, are there strange people walking around with cutters?) and determine how to respond from there (ignore it till morning/go to site/call police..).

I wouldn't want to get messages for regular motion events otherwise -- I definately don't want to be waken up everytime a spider crawls across the lens!