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Latency in video
Hi,
I’ve recorded something with my camcorder . When I look at it without editing it’s fine. When I import it into AE and work with it and then render it out ..The video has some latency and is not syncd to the audio. What may be the reason of this and how can I solve it?
My video format is WMV. -
2 Replies
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We have upgraded a video distributed system in a church to HDMI from VGA
But they have an analog PTZ camera. Composite source.
There are 13 HDMI screens(LED) in the church building The analog picture is also transmitted to a nearby building together with sound which is delayed so that’s ok.
The live screens are fed via a Kramer VP 728 and the outside picture another VP 724. The HDMI distribution in the room is over CAT6 using AAVARA PB5000+ units.
Our main headache and problem is video latency and delay on the live screens from the analog camera.
I have done tests and when we feed a HDMI camera directly into the AAVARA HDMI over Cat6 system the latency is acceptable. But once you convert the analog camera via the Kramers and then onto the HDMI the latency and lag becomes very bad. We have tried a stand alone composite to HDMI unit to feed into the system and then its also bad
Its very disturbing as many watch the screen and listen to the sound system and the lip sinc is very bad. We can delay the sound a bit but I don’t think enough to sort out the problem
Which PTZ camera and switching system could we look at? We want something with minimum latency live and smooth transitions as they also use a laptop with HDMI. The KRAMER has a second or two delay and black screen before switching.(I have no idea of how many frames) So the main problems seem to be the converting from Analog to HDMI and then the Kramer scalers. -
I have worked with a similar (though smaller) system in a church in the past…
My solution at the time was to keep the video and the audio running through the same equipment whenever possible… the person who had setup the system ran the video though a computer based video switcher and the audio through a regular sound mixer but the computer based switcher caused a delay in the video whereas the audio had no such delay. they were messing about with trying to put a delay into the audio and trying to link it up, I ran the audio through the computer mixer and the sync was all together in the video output…
For your in-room video situation, I’d look at using a better video converter from sd to hd then run a live hdmi video mixer so as to reduce any delay…
I’d be happy to talk to you further on this if you’d like…
–James
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