JamesDVR

the cameras have already been selected. i'm afraid i don't know what model they are, but i do know that most of them are using 25/8 lenses. several cameras are being used to monitor each lane, which is why i requested a 4 channel dvr. thank you for all your help. i will be sure to suggest the alternative package, and let you know how i get on.

Maybe I should have been clearer about what the DVR will be used for... There will be camera's mounted high on street lights, monitoring roads, and they detect when a vehicle is passing. The camera's job is to make a record of what vehicle passed making note of Licence Plate. This data is processed electronclly without human intervention. The idea of the DVR is that it will be used during the 'proving' stage of the application. We need evidential records that a human operator can go through frame by frame in order to make sure that what the application is seeing and reporting is actually true. I've been told this is why it is important to have 50 fields per second recorded (frame = 2 fields, and when movement between those two fields = blur), because anything less will cause a blur effect making the licence plate unreadable. The period of time we will be monitoring each site is approx. 24hrs, after which we will return to the site, remove the DVR equipment, copy across the data to be processed later, and then install it at the next site. Is this of any help?

that would be great, kandcorp. i look forward to your, and anyone else's recommendations!

ok... just re-read my own specification, and I'm asking for 50 fields per seconds per channel... so is that the same as 25 frames per second per channel, which is what most manufactures mean when they say 'fps'? if this is right, then it would open up a lot more possibilities for me, because I have seen many DVR stand alone units that can deliver 25 frames per second per channel. But my problem still remains that the application I will be using the DVR in requires that: "Every FIELD must be recorded. Not acceptable to record FRAMES, as these are made from two fields 20ms apart. It must be possible to skip through FIELD by FIELD..." The statement above is talking about functionality that is well beyond my level of understanding when I'm looking at a Datasheet for any DVR. Does anyone know for sure if there is a DVR that would by true for the above?

rory - thanks man. Do you have a link to the specification of the DSR-2000? Using 4 of them could be an option, but I would need to know the dimensions. also, any recommendations for a stand alone DVR unit that can record on as many as 8 channels at a single time, where recorded video doesn't drop any fields and is recorded at a resolution of 720 x 288? The specification is so exact because the data collected could possibly be used as evidence. A more comprehensive list follows: • Record up to 24 hours of video from each of up to a maximum of 8 cameras at a single time. • Video connections 75 Ohm BNC • Video signal has the following characteristics : • PAL • 50 fields/sec • Resolution 720 x 288 • Recorded video must not drop any fields. • Recorded video must be at full resolution. • Storage format of video to be MJPEG. Any help will be very much appreciated.

Thanks for the quick response. I was looking for a stand alone DVR unit rather than anything PC based. I was aware of the '2 fields for every frame' rule, but when browsing the DVRs available over the 'net it hardly ever says whether the fps relates to fields or frames. 50 frames per second per channel would be awesome, but after reading kandcorp's comment, I'm unsure it is even possible. kandcorp - are you sure about this or is it something you have concluded through experience?

Hello Everyone, I do hope you might be able to help me. It seems like I've searched the 4 corners of the Internet and have yet to come up with any DVR unit that meets the specification I need. The most important thing I'm looking for is a DVR that can record on up to 4 channels at the same time and at no less than 50 fps per channel (PAL). Ideally, the perfect solution would actually be on up to 8 channels, but I have a feeling this sort of quality might be unrealistic? Also, a fairly decent resolution would be of great benefit. Does anyone know if such a model exists, and where I can get it from? Many thanks in advance. James 'DV' R.