[AG-TECH] Video and audio delay mismatched?

[Andrew Danson]

Hi Guys,

Me and David have recently set up a new AG machine and are having a strange issue. Basically the video in particular appears to have a delay much like a satellite link. If I move it takes about 5ish seconds to show on the screen. These are the locally decoded videos from what Vic is transmitting. Audio similarly has a delay but not anywhere near as long (around 1 second at a guess from the meter movements.) so we'd look like a badly dubbed Japanese movie/TV show the way things are now.

The actual video framerate looks fine, I have some minor issues with the audio I'd like to address, but that shouldn't affect the delay.

The machine is powerful enough, and we don't seem to have any issues like this at all with Seevogh on the same system. Graphic card and audio performance also seem fine. So I'm thoroughly befuddled as to what the issue could be. If anyone would like to test with me to see what I mean (and if it translates to what is actually sent) that would be greatly appreciated. :)

Cheers
Andrew

[John I Quebedeaux Jr]

It could be network related? - i.e. network ‘enforcer’ - i’ve had this happen and had to work with my local campus network folks to get priority with my multicast traffic (ultimately they setup a dmz just for our multicast). I.e they were regulating network traffic and it would cause a similar problem to mine.

The symptom would be that ONE video stream would be on time, everything else would lag (queue) up by various amounts. It happened in only one direction too.

The problem manifested on the receivers, not locally - and again it was multicast. I don’t know if that’s helpful or not to know as i’m not a network person…

-John
--
John I. Quebedeaux, Jr.; Computer Manager LBRN
Louisiana State University; Biological Sciences; 437 Life Sciences Bldg.
Baton Rouge, LA 70803; 225-578-0062; http://lbrn.lsu.edu

On Jun 30, 2014, at 1:55 AM, Andrew Danson <***@newcastle.edu.au<mailto:***@newcastle.edu.au>> wrote:

Hi Guys,

Me and David have recently set up a new AG machine and are having a strange issue. Basically the video in particular appears to have a delay much like a satellite link. If I move it takes about 5ish seconds to show on the screen. These are the locally decoded videos from what Vic is transmitting. Audio similarly has a delay but not anywhere near as long (around 1 second at a guess from the meter movements.) so we’d look like a badly dubbed Japanese movie/TV show the way things are now.

The actual video framerate looks fine, I have some minor issues with the audio I’d like to address, but that shouldn’t affect the delay.

The machine is powerful enough, and we don’t seem to have any issues like this at all with Seevogh on the same system. Graphic card and audio performance also seem fine. So I’m thoroughly befuddled as to what the issue could be. If anyone would like to test with me to see what I mean (and if it translates to what is actually sent) that would be greatly appreciated. :)

Cheers
Andrew
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