50 Hz

[luckyo]

Hi

I have the following problem. I have a 50 Hz non interlaced signal I want to record to my Macintosh.
I only have a BNC port to grab the signal on the source.
Is there any external video card/software where I can record that signal correctly.
Right now if I display it on a Monitor it is all messed up.
I believe this is because the monitors are all only 60 Hz and above.
And that would be my second question:
How can I display a 50 Hz non interlaced signal on a standard TFT screen, and if that is not possible, any screen.

Any help would be really awesome.

Thank you very much.

[usually_quiet]

"50 Hz non-interlaced" isn't enough information. What is the source of the signal you want to record? Capture device recommendations would depend upon the video's resolution and the number of frames per second, among other things.

[Bjs]

You can use almost any capture device ... almost in reference to Macintosh ... all you need to do is get a cable with bnc on one end and rca jack on the other ... it's the same deal with most security systems ... pass signal to vcr, pvr, capture card.

[edDV]

BNC can be analog (PAL) or digital (SDI).

If standard def there are several options. For high def the choices narrow for the Mac.

We also need to know which Mac and the types of ports available. Firewire? USB2?

[luckyo]

Thank you for all the answers !
I have a 50 hz non interlaced analog 576i signal.
And I am trying to record to a Mac Book Pro or Mini.
Any suggestions on how to digitize the a analog signal and record to a Mac would be awesome.

It would also be helpful to see what is coming out (image from that signal).
Is there any TFT that can display 50 Hz non-interlaced analog signal ?
Or any screen for that matter, with a BNC in.

Thanks again.
Any answer would be awesome.
And sorry for my delay

[usually_quiet]

You say the video signal is non-interlaced, then say it is 576i, which means the signal is interlaced. Maybe you could tell us the make and model of the device producing the signal so we can figure out what the signal really is.

[luckyo]

Sorry, my error that I said 576i.

It says "50 Hz non interlaced" at the BNC out (Fact).
And I know that the signal is a CCIR signal with 50 Hz and 576 lines (Fact).
There seem to be quit a bit of variety of resolutions with 576 lines.
What also would have helped a lot is a device that I could hook up to the BNC port and that tells me exactly what signal/resolution it is. I would be very happy if anybody could suggest a device like that
They also told me it is a "raw camera signal, without any stack filters".

I couldn't find a decent priced 50 Hz TTF screen where I can display it.
If I try to digitize it, the image is aligned wrong, but I can record it, so the digitizer recognizes the signal (the digitizer can only do 625/25 PAL).
So I suspected that the error is due to the 50 Hz and non-interlaced issue.
But maybe also due to the raw signal that messes things up.

So what I would like to achieve is:
1. Display it on any screen
2. Record it.

Thanks and sorry for the confusion.

[usually_quiet]

Sorry, my error that I said 576i.

It says "50 Hz non interlaced" at the BNC out (Fact).
And I know that the signal is a CCIR signal with 50 Hz and 576 lines (Fact).
There seem to be quit a bit of variety of resolutions with 576 lines.
What also would have helped a lot is a device that I could hook up to the BNC port and that tells me exactly what signal/resolution it is. I would be very happy if anybody could suggest a device like that
They also told me it is a "raw camera signal, without any stack filters".

I couldn't find a decent priced 50 Hz TTF screen where I can display it.
If I try to digitize it, the image is aligned wrong, but I can record it, so the digitizer recognizes the signal (the digitizer can only do 625/25 PAL).
So I suspected that the error is due to the 50 Hz and non-interlaced issue.
But maybe also due to the raw signal that messes things up.

So what I would like to achieve is:
1. Display it on any screen
2. Record it.

Thanks and sorry for the confusion.

I am still not sure I have enough information to help, but I will try.

I am guessing that "CCIR" means the signal from a closed circuit infrared camera, and not an unspecified video standard from the Comité Consultatif International des Radio Communications.

You could try testing a small LCD TV as a monitor. An LCD TV can display both interlaced video and progressive (non-interlaced) video. LCD TVs also have a refresh rate of 50Hz in PAL countries and accept more types of analog video than most computer monitors. A normal computer monitor only accepts analog video that conforms to one of the VGA standards.

From what you describe, it looks like your source device only has a single BNC video connector as its video output. If there is only one video output from the source device, you could try it with the green component video input on the TV. This would provide a monochrome picture if it is successful. If the BNC connection from your source is male, you would need a female BNC to male RCA adapter to connect your source device to a TV. It may not work but BNC to RCA adapters are inexpensive and should not be difficult to find.

If a TV works as a monitor, then the Hauppauge HD PVR may work for capturing your video source, but I am not certain of it. You would need female BNC to male RCA adapters to connect your device to the HD PVR's green component video input. The Hauppauge HD PVR can record 576p50 video as H.264 and can work with a Mac. The following third party software is required when using a Mac: http://www.hdpvrcapture.com/cms/?q=node/1

[jagabo]

Your camera probably outputs a standard interlaced PAL 576i composite signal but each pair of frames comes from the same point in time. So the signal is interlaced but the pictures contained in that signal are progressive and come from a progressive sensor. Any standard PAL TV with a composite input should work if you get a BNC to RCA or BNC to SCART adapter.

http://www.amazon.co.uk/Adaptor-BNC-plug-RCA-socket/dp/B0012IKBSU
http://www.amazon.co.uk/BNC-CCTV-SCART-TV-LEAD/dp/B0027WCXPY

Computer monitors generally cannot sync to standard defintion composite signals. Any capture device that can capture composite PAL video should work. Which is basically what you said here:

If I try to digitize it, the image is aligned wrong, but I can record it, so the digitizer recognizes the signal (the digitizer can only do 625/25 PAL).

Most standard definition capture devices cannot sync to a 50p signal at all. At best you would get a rolling, scrambled picture.

[edDV]

The more info you supply on the source device, the more we can help. Is this medical equipment? A process control camera? We can only guess.

The LCD TV display test will somewhat narrow the issues.

[luckyo]

Thanks to everybody.
That was exactly what I was looking for.
So a regular TV with 50 Hz should do the trick.
The cables I already have.

Thanks so much again for the very detailed answers.