Originally Posted by foxeng
That is what the ROSA server is for. It will splice in when the local, regional spot airs. So I have been told. We haven't gotten ours yet.
The e-mail I got made note about what the 2nd splicer was for. To which I say... D'Oh!
I thought that it was a backup for if "A" failed.
As someone who has sat in Master Control and watched the output of the Tanberg and the output of the analog receiver, they aren't more than 1/4 of a second out of sync.
A quarter of a second would still cause a noticeable time glitch on the screen. Where it really counts is what the viewer would see when going from net to local. There is added delay when going through the local MPEG-2 encoder. What you were looking at was before the encoder. So, after going through the station's MPEG-2 encoder and the splicer is told to go local, it switches from a short delay path, compared to a longer delay path as a result of going through ASI -> HD-SDI ->plant routers,etc -> MPEG-2 encoder -> splicer. The normal path, when switched to net is ASI -> splicer.
The splicer is seeing that same feed at the same time. Remember, what you see off air has decode latency as well.
Who cares what the decode latency is at home. That latency will always be the same, not matter the source that station is using. So that is a non-issue.
When the splicer is first set up, there is a time routine that sets up the "splice" time for the splicer so it seamlessly switches back and forth from the "analog" path if you will and the splicer network signal. The splicer can act as a short duration DVR if you will. These things aren't done in a vacuum, even though it seems like it at times.
Now that is piece of information that was missing before. The vacuum now has some air
So, if the installers get the system timed out so that the upconverted analog (that is still a dumb thing to do to a station) will match net in the splicer, that is great. That means if a station did try and use the HD-SDI output, they'd have to try and do timing setup with that. But, if it have more delay than the analog to HD-SDI (or analog to SD-HDI) converter, that can't be fixed.
With that last piece of splicer DVR info, I am all set with what is going on with the delays.
BTW, I'm not trying to be a pain, this is a learning experience. If I probe enough, the needed info ultimately will appear.