satellite audio and video not in sync in chapel

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lajackson
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#31

Post by lajackson »

techgy wrote:We only use the RF signal in the chapel to pick up the ASL broadcast on a specific channel. We use a video output signal (No RF) for the projector and we've never noticed a delay. Is the delay on all audio channels (IE; other languages)? Do you have a video output w/o the RF?

We do not have a separate video only output signal in the chapel, just the RF from the old coax.

It is hard to tell if other languages have a delay, since the lips do not match the words in other languages [grin].

When English is being fed on the Spanish channel (i.e., the BYU feed during non-broadcast times), there does not seem to be as much of a delay.
russellhltn
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#32

Post by russellhltn »

lajackson wrote:However, our very old televisions also have the delay, so it appears to be a difference between the audio processing and the video processing at the satellite rack.
That's odd. Have you tried rebooting the receiver?
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russellhltn
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#33

Post by russellhltn »

lajackson wrote:It is hard to tell if other languages have a delay, since the lips do not match the words in other languages [grin].
It does when the choir sings. ;)
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techgy
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#34

Post by techgy »

lajackson wrote:We do not have a separate video only output signal in the chapel, just the RF from the old coax.

It is hard to tell if other languages have a delay, since the lips do not match the words in other languages [grin].

I figured that all buildings that had satellite had a video output, but I guess not. It actually provides a cleaner signal that the RF does.
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shanebankhead
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#35

Post by shanebankhead »

RussellHltn wrote:If it's a common issue in home theater, then I'd expect there to be a simple solution. Otherwise the projector manufacturers will get black marks and slow sales.

I agree, I'm not sure how a common Sony projector can have such a large delay without a lot of complaints. But I assure you it's there. You can Google different combinations of "audio video delay lip sync" and see that there are a lot of people dealing with the issue.

I suspect most of the delay has to do with the scan conversion of our composite video input, which would require some processing. I don't think there is much delay at all if the projector is connected to a VGA source at its native resolution.

There is a simple solution, except that it requires investing in some equipment. Some home theater receivers have delay adjustments, and you can also buy delay boxes to fix the problem. For instance: http://www.felston.com/

I'm just exploring other options before adding more equipment to our setup. I'll report back if I have any success.
lajackson
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#36

Post by lajackson »

RussellHltn wrote:That's odd. Have you tried rebooting the receiver?

In thunderstorm country, almost every successful broadcast is preceded by a reboot, so yes.

I opined last conference that it is the feed itself, where the video is inserted a little later into the lengthy audio stream to accomodate the multitude of languages being provided over the Church satellite system (upwards of 70 or 80 now, I think). There were no takers for that theory last time, and I doubt there will be this time, either.

We are really quite happy to get any semblance of the broadcast around here, and have not worried too much about the nuances and technical details of the video portion of the feed. When I showed up Sunday morning, the choir director had turned on the chapel sound for Music and the Spoken Word (I taught her how several years ago), but the projector had not even been set up.

Perhaps the next specialist called will not be so casual in the performing of his calling.

Agency. I still vote we keep it.
russellhltn
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#37

Post by russellhltn »

lajackson wrote:I opined last conference that it is the feed itself, where the video is inserted a little later into the lengthy audio stream to accommodate the multitude of languages being provided over the Church satellite system (upwards of 70 or 80 now, I think). There were no takers for that theory last time, and I doubt there will be this time, either.
I wouldn't rule out a problem with the feed, but I'm not sure as I'm buying the reason.

In the analog days, sync wasn't an issue. Everything ran "real-time". With the introduction of digital processing, delay was a natural by-product. All it takes is for someone to add a new processing step in either the video or audio chain and things are out of sync.

What receiver do you have? I wonder if there's a delay feature that's mis-set in your case.

Something that would be interesting to check, look for sync in the "countdown" video, or the in-between session stuff.
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lajackson
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#38

Post by lajackson »

RussellHltn wrote:I wouldn't rule out a problem with the feed, but I'm not sure as I'm buying the reason. . . .

What receiver do you have? I wonder if there's a delay feature that's mis-set in your case.

Something that would be interesting to check, look for sync in the "countdown" video, or the in-between session stuff.

This answer is as technical as I can get it from off the top of my head.

We have the standard Church digital receiver. Two audio channels are pulled and added with the video onto separate tunable broadcast frequencies, then the two frequency channels are combined into a single RF feed and distributed throughout the building. Plug in a TV and tune to the channel with the audio you want to hear.

I have not noticed the problem to be as great during broadcast material that does not originate from the Conference Center. On the other hand, I do not pay as much attention to the other material as I do to the conference speakers, which is why I happened to notice it again this past weekend.

I suppose I should quite fussing and go check it out for myself, if no one else cares enough to do it. [grin]
russellhltn
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#39

Post by russellhltn »

lajackson wrote:We have the standard Church digital receiver.
Which one? The models have changed over time. I've got both a "original" (tech support seemed surprised it was still working) and a "late" (for ASL). There might be more models in between.

Best I can say is the "original" is a cream colored with just two push buttons.

The late is gray with a LCD display and buttons arranged in a circle pattern for Up/down and sideways.
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lajackson
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#40

Post by lajackson »

RussellHltn wrote:Which one? The models have changed over time. I've got both a "original" (tech support seemed surprised it was still working) and a "late" (for ASL). There might be more models in between.

Best I can say is the "original" is a cream colored with just two push buttons.

The late is gray with a LCD display and buttons arranged in a circle pattern for Up/down and sideways.

I think we still have an original. It was replaced about a year after we went digital with one just like it. I will check Sunday when I am there next.

Do the different models have differences in visible sync?
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