Video Delay Issues

[SHARYNF]

Originally Posted by RZUMBA

Thanks Sharynf. I will try some direct connections to see if the delay is still present. I may try a different camera (CCTV) first. Then I will go the Peavey option to delay the video. Thanks again!

The Peavey option is to DELAY THE AUDIO, your video is already delayed based on what you are saying here.

I would GUESS that most of your delay is from the mixer be interested to see what you find out
Standard video runs at 29.97 Frames per second so roughly 30 frames per second, or 15 frames for half a second delay
I would GUESS that you are closer to 7 frames delay with 1-2 in the camera 2-3 in the mixer and 1-2 in the display
2 frames or so is not noticable under most conditions and even 3

Sharyn

[Chris15]

This is why digital anything is a really bad idea for something like a conductor relay camera...

I'd try camera straight into display and see what the latency is there and then add in extra components and see where the main culprit is...

Yes you could delay the audio, but that won't fix the issue of the half of the class watching the instructor direct being out of sync with those watching on the displays...

[SHARYNF]

I could depend on the application, IF the class watching is remote from the live performance and just needs to see audio and video in sync then a delay will work, IF on the other hand the class needs to be doing something where timing is very critical and they need to rely on the monitor to say for instance PLAY instruments in sync with the live performance then things get a bit more critical

Our eyes are very very good at picking up the out of sync between sound and lips for instance
Sharyn

[RZUMBA]

I hooked up camera directly to the Video Distribution Amp (By passed Mixer) which splits signal to both screens and still experience same delay. Since I need to split the signal to both screens, I did not try direct to displays. Given the fact that I need to split the signal is there a recommendation of cameras that offer a faster frame/sec or do not need to process like a video camera. Will a CCTV Camera work better? I don't have one, but I also don't want to buy one just to see if it would work.

I guess I need to try direct to the displays, if it is acceptable, or at least improved, I could possible get a cable with two males at one end and connect one cable to both displays.?.?.?

By the way, delaying the audio is not an option since the audience is live and the instructor on stage needs to be in sync with the screens.

Thanks to everyone for their input - Problem is, I have a show this weekend and it sounds as though there is no quick solution or at least not an affordable one.

[fredthe]

I'd say it's 50/50 chance between the camera and the display being the problem. See if you can find a CRT TV to connect the camera to, to see if it's the source of the delay. If it's the displays causing the problem, replacing the camera won't help.

And no, you can't just use a Y-cable to drive both displays, and I doubt they have a loop through connection.

-Fred

[SHARYNF]

Interesting that the mixer is not the problem. See if you can borrow a standard Camcorder, Personally I like the sony models, as they typically don't need to use the remote to turn off the display mode of info on the display feed. Leave the tape out, use the composite video as the connection (you might need to find the av cable from the camcorder sony uses a 3 connection cable.

Try to re set the displays to standard video resolution. It is Possible that the display is taking a few frames to upscale the image.

A few frames of delay is probably the best you are going to get. what is the application where the display needs to be exactly in sync with the audio? If it is just talking then it is annoying but workable (a lot of tv cable/Sat feeds get out of sync) Is they any chance that the connection to the display is VIA a RF link usiing a TV channel. I have seen this where a RF conversion is used to feed remote display tv;s and they you are absolutely going to get a delay that is not going to be able to be eliminated unless you go direct to the display.

Sharyn

Sharyn

[RZUMBA]

Thanks again to fredthe & sharynf. To answer the question, "what is the application" The live person on stage (dancing) needs to be in-sync with the live video on the screens. People in the audience are following the instructor on stage. As far as the audio is concerned, it is a separate matter.

I will try to find a CRT TV as well as another Sony Camcorder. I had an old one, but I am hard pressed to know where it may be.

As i mentioned earlier, I am using a Sony, but is is a DCR-DVD Camera.