Jim Brown
Forum Replies Created
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Ronak,
You are right in that your sources cannot be genlocked externally and so you must use the frame synch capability of the ATEM. This means you will incur a 1-2 frame delay which is 33-66msec. If you connect your audio source into the ATEM switcher it will be aligned with the video at the output. ie both audio and video will be time shifted by 33-66msec. If you delay the audio prior to connection to the ATEM, the audio will be further shifted. You would only shift the audio if you were trying to align with the stage and a video display on the stage and with only 1 or 2 frames of delay, I would dare a mere mortal to see it with the naked eye. I am not sure, but I do not think HDMI to SDI converters introduce additional delay. Beware of HD to SD converters as they can introduce additional delay.Jim Brown
M&M ProductionsUSA -
You did not indicate what the destination is from the ATEM. I really doubt you will more than a frame of delay (33ms) which is not discernable. I would try it without the delays first.
My $02 worth
Jim Brown
M&M ProductionsUSA -
While not technically correct you could Y the single output and feed an input to each channel of the ATEM. This would provide equal left and right audio to you output devices. …or preferably use a mixer that has stereo or dual outputs.
Our experience has been that the ATEM does not introduce significant delays especially if you genlock the inputs. It is noticeably better than the Tricaster XD series which we have used. We have noticed that some cameras do introduce up to a frame or more of delay when set to output at certain resolutions. Also if your output is a video projector, they are notorious for 2-6 frames of delay. It is cumulative to every device in the chain.
Jim Brown
M&M ProductionsUSA -
The iPod is an excellent solution. Also, if your monitor has a usb port you can put the file on a thumb drive and set the monitor menu to loop. That also works for slide shows with stills or powerpoints.
Jim Brown
M&M ProductionsUSA -
Markertek is a good link, but if you have a Radio Shack close by you will need the following:
BNC to Phono Adapter
Model: 278-254
https://www.radioshack.com/product/index.jsp?productId=2104082This will connect from the cable coming from the camera. You will then need a BNC coupler to connect to your bnc cable.
https://www.radioshack.com/product/index.jsp?productId=2062625
Just add the needed length of coax cable with bnc on each end and you should be good to go.
Regards
Jim
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I would be very surprised if those BNC connections are not composite or at best component (rgb), In any event they will be standard def. You will need the interface cable which came with your camcorder. It will go to an rca connector which you will have to adapt to bnc. (Radio Shack). The cable which provides composite (Yellow RCA) and two audio is different from the one which provides component (RGB). If it is component you will need three of those rca to bnc adapters.
Another thing to consider is how you are getting audio. Is the presenter miked through a PA? Can you get a feed from the soundboard? Is that feed mike or line level. The EX1 can handle all of this. You will just need the right cables, connectors and settings.
Lots of luck to you.
Jim Brown
M&M ProductionsUSA -
The camera will simultaneously output and record. The frame rate and resolution will be the same. ie 720p, 1080i. The bigger issue is the connectivity to the projector. Most projection systems in permanent installations do not accept SDI inputs. That is usually done through an optional card that simply is not present. Also, most do not accept HD resolutions unless very recently installed and even then only if it was a high capability installation. You may have to drive with component or even composite outputs through the AV breakout cables.
You most certainly want to resolve the projector connectivity and cabling issues first. Recording will be the easiest issue.
Jim Brown
M&M ProductionsUSA -
(As if I am using all 1080i cams via HDMI and HD/SDI and an s-video signal from a laptop or DVD player at a different resolution/format)
You should run the computer display through the HDI display port. If you computer outputs DVI-D then you will need a converter cable. We do this with a MacbookPro and get no degradation of the signal. You can also play the dvd in the computer. Avoid the composite input and s-video if at all possible.
Jim Brown
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We do this quite often with MacBook Pros. I have also had success with Dell laptops. You just need a video card that is capability of outputting to a video resolution. Most machines that have an HDMI output are capable of this.
Jim
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Don’t blame it all on the camera, although some does exist there (probably 1-2 frames). In all likelyhood the culprit is the projector itself, anywhere from 2 to 8 frames depending on model and resolution you are sending it. Also, you probably had a switcher in line which can introduce anywhere from 1-6 frames of delay.
To minimize the delay, send the projector a video signal at it’s native resolution. If it is not an HD projector that is probably 1024×768. Projectors are notoriously sloooow at conversion.
If you have a switcher make certain you genlock the cameras if you can. That will save a bunch depending of the model of the switcher.
Delays are additive to every component in the chain. You will have some no matter what you do. At 4-5 frames delay it will take a good eye to see it. 6 frames and anyone can see it if it is pointed out. 7 or more and the audience is annoyed by it. We make every effort to place imag screens to the side of the stage so that it is not quite as noticeable. The kiss of death is an imag screen directly behind the speaker.
Just some thoughts.
Jim