RE: [A] Infinite continuous logging of 16 TV (A+V) channels
Thank you all who responded to my original email. I passed the info and obviously someone got wiser and re-defined the inquiry: Digital Video Recorder Input: 16 channels (A/V) / Multiplexer, Output: 1/4/9/16 simultaneously Video, 1 channel Audio Memory: HDD 320 GB Again I am not sure I understand the type of device described above. All I know is its a part of equipment setup. I guess this kind of device is expensive and the previous inquiry was intended for a cheaper emulation. Can anyone give me hints what am I looking for? Thanks in advance, Roman Golubovski, MSc Dipl-EEng [EMAIL PROTECTED]
Re: [A] Infinite continuous logging of 16 TV (A+V) channels
Roman Golubovski [EMAIL PROTECTED] said: A friend from a TV station would like to set a system for continuous 24h (or on-demand) recording of 16 TV channels (composite or AV) with professional quality. Presumably they have heard of tape recorders, they're after a computer-based solution for whatever reason and this is why they asked Roman... Do they want to do something like maintain a recording of the last 7 days of output, and have random access to it to review/archive certain segments? Somebody like Avid (http://www.avid.com) will probably build them a system to do that, but it won't be cheap! An alternative might be to have a suite of PCs or Macs running standard video capture and editing software like Apple Final Cut Express or Adobe Premiere. You'd have to think about how the 'continuous' recording was going to work in that case - maybe rolling over from one file to another every few hours using some kind of software scripting, depending on what those packages are capable of. I don't know of any solutions in between those two, but that doesn't mean they don't exist... As for data rate and disc space, I believe DV is generally considered the entry level for 'professional' quality, and a DV stream is 3.6 megabytes per second. Dr Tom Hawkins High Throughput Screening Analyst, Associated Octel ltd PO Box 17, Ellesmere Port, Cheshire CH65 4HF, UK +44 (0)151 355 3611 [EMAIL PROTECTED] - Email provided by http://www.ntlhome.com/
RE: [A] Infinite continuous logging of 16 TV (A+V) channels
I would initially say it is not feasible. You would need multiple PCs with several IMAQ cards (+ audio) each to get all the data into a system, and very large, fast hard drives to store the data. The drives would fill up very quickly. If you went to on demand recording of selected channels, it becomes reasonable, but still big. It would depend on the actual requirements. One thing I would consider if you decide to do a system like this is to look at video to firewire converters that combine a video and audio signal and convert it to digital video for firewire. I don't know if this format is compatible with the NI firewire drivers (I doubt it), but that might compress the video enough to record several channels on a single computer. They might be cheaper than IMAQ cards, which could only handle one channel each. They would also take care of synchronizing the video and audio for you. I don't know if the quality would be considered professional quality, though. I would probably just look at a large tape machine that records several channels to a large magnetic tape, and have backup system ready when you need to change the tape. Bruce -- Bruce Ammons Ammons Engineering www.ammonsengineering.com (810) 687-4288 Phone (810) 687-6202 Fax -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Roman Golubovski Sent: Monday, March 01, 2004 4:24 AM To: [EMAIL PROTECTED] Subject: [A] Infinite continuous logging of 16 TV (A+V) channels Hello, This is out of my expertise so I am posting it on the forum. A friend from a TV station would like to set a system for continuous 24h (or on-demand) recording of 16 TV channels (composite or AV) with professional quality. What would be the cheapest and most efficient solution HWSW - single or multiple IMAQ cards, single or multiple PCs, drivers, software, ..., considerations on reliability? I appreciate any info regarding any aspect, especially concrete products. Thanks in advance, Roman Golubovski, MSc Dipl-EEng [EMAIL PROTECTED]
