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| Topic: | DVR Question This thread has 7 replies. Displaying all posts. |
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| Post 1 made on Thursday June 14, 2012 at 21:35 |
brucewayne Active Member |
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Posts: | March 2006
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The Security camera DVr has an hdmi , VGA and bnc video out . We have a zektor matrix switch with the 4 composite inputs free . If the cameras all come in on a coax feed then wouldn't you get the same quality picture out of the VGA as you would on the composite output?
All the component inputs are used and the client said he would take an rarely used source off the matrix if it would be better quality picture than the composite in .
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brucewayne |
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| Post 2 made on Thursday June 14, 2012 at 23:15 |
1234tech Long Time Member |
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Posts: | January 2007
36 |
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DVRs are "computers" with a video card. The VGA output will likely be higher quality/resolution than compsiite. There may be different resolution options for the VGA output, you may have to test to see which is best.
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| Post 3 made on Friday June 15, 2012 at 00:09 |
crosen Advanced Member |
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777 |
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On June 14, 2012 at 21:35, brucewayne said...
The Security camera DVr has an hdmi , VGA and bnc video out . We have a zektor matrix switch with the 4 composite inputs free . If the cameras all come in on a coax feed then wouldn't you get the same quality picture out of the VGA as you would on the composite output? Right, if the input signal is composite video, you can't improve the quality by outputting to a superior format unless using video processing that a security DVR is entirely unlikely to have.
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If it's not simple, it's not sufficiently advanced. |
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| Post 4 made on Friday June 15, 2012 at 01:07 |
Ernie Gilman Yes, That Ernie! |
Joined:
Posts: | December 2001
19,752 |
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On June 14, 2012 at 23:15, 1234tech said...
DVRs are "computers" with a video card. The VGA output will likely be higher quality/resolution than compsiite. There may be different resolution options for the VGA output, you may have to test to see which is best. crosen's answer is more accurate than this. The VGA output will be the particular crummy resolution of the camera, broken up into smaller bits (pixels) and sent out at a higher rate, to make a terribly accurate reproduction of the crummy image from the camera. As for the different resolution options, those are definitely worth messing with. There's no reason, for instance, to take a 480i signal from a camera, then convert it to 1080i and send it to a 720 display that then has to convert it to 720p. Things don't get better with multiple conversions.
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We can't give you a good answer, or maybe any, without the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
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| Post 5 made on Friday June 15, 2012 at 09:30 |
iimig Active Member |
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706 |
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If many cameras are being viewed,or the OSD will be used, the extra resolution is definitely nice to have.
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| Post 6 made on Friday June 15, 2012 at 11:26 |
1234tech Long Time Member |
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Posts: | January 2007
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On June 15, 2012 at 01:07, Ernie Gilman said...
crosen's answer is more accurate than this.
The VGA output will be the particular crummy resolution of the camera, broken up into smaller bits (pixels) and sent out at a higher rate, to make a terribly accurate reproduction of the crummy image from the camera.
As for the different resolution options, those are definitely worth messing with. There's no reason, for instance, to take a 480i signal from a camera, then convert it to 1080i and send it to a 720 display that then has to convert it to 720p. Things don't get better with multiple conversions. question was will the VGA give a better picture than composite (BNC) ouptput. the answer is accurate becuase the composite out is limited to 640x480 and the VGA can be different resolutions based on the setting. to iimig's point, since there is a OSD involved, the video from the cameras get scaled into the resolution of the OSD and then output through the VGA. The best picture will be the native resolution of the OSD/video card combined. the composite output will likely be down scaled to 640x480. Since the output of analog DVRs are typically 4x3, any scaling from the VGA output (some offer 16x9, etc) could of course alter the image quality hence the recommendation to try different VGA outputs. agreed you can't improve the input of the analog camera input but you have to consider what the DVR is doing internally to CIF/D1 images when adding them to an OSD and displaying multiple cameras at once
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| Post 7 made on Saturday June 16, 2012 at 07:08 |
cpchillin Select Member |
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Posts: | September 2007
2,232 |
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On June 15, 2012 at 09:30, iimig said...
If many cameras are being viewed,or the OSD will be used, the extra resolution is definitely nice to have. We have a winner. I have seen the difference between a composite output on a speco dvr and its VGA output. Single camera onscreen was about the same but the split screens were better with VGA. If the DVR has an HDMI out then it might have some video processing that'll make the cameras look better then they are.
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Who says you can't put 61" plasmas up on cantilever mounts using toggle bolts? <---Thanks Ernie ;) |
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| Post 8 made on Saturday June 16, 2012 at 07:09 |
cpchillin Select Member |
Joined:
Posts: | September 2007
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On June 15, 2012 at 11:26, 1234tech said...
question was will the VGA give a better picture than composite (BNC) ouptput. the answer is accurate becuase the composite out is limited to 640x480 and the VGA can be different resolutions based on the setting. to iimig's point, since there is a OSD involved, the video from the cameras get scaled into the resolution of the OSD and then output through the VGA. The best picture will be the native resolution of the OSD/video card combined. the composite output will likely be down scaled to 640x480. Since the output of analog DVRs are typically 4x3, any scaling from the VGA output (some offer 16x9, etc) could of course alter the image quality hence the recommendation to try different VGA outputs. agreed you can't improve the input of the analog camera input but you have to consider what the DVR is doing internally to CIF/D1 images when adding them to an OSD and displaying multiple cameras at once I think this is a good answer too.
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Who says you can't put 61" plasmas up on cantilever mounts using toggle bolts? <---Thanks Ernie ;) |
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