RE: schematics Not at the moment, its closed-source as such (got a lot of properity parts on the board for switching inputs, camera failure ai etc...) - ill have a word with my hardware guy later for you and see if I can get some stuff off him for you! Thanks, Kind Regards, Matt Brocklehurst, LookCCTV. Tel: 01253 891222 Fax: 01253 891221 Web: www.lookcctv.com Email: matt@xxxxxxxxxxxx -----Original Message----- From: Ryan Ayers [mailto:rayers.list@xxxxxxxxxx] Sent: 28 August 2003 13:11 To: video4linux-list@xxxxxxxxxx Subject: RE: Whats the best way of doing this! You mean you built your own card? Could you post some schematics somewhere? Ryan > -----Original Message----- > From: video4linux-list-admin@xxxxxxxxxx > [mailto:video4linux-list-admin@xxxxxxxxxx]On Behalf Of Matt > Brocklehurst > Sent: Thursday, August 28, 2003 6:53 AM > To: video4linux-list@xxxxxxxxxx > Subject: RE: Whats the best way of doing this! > > > Atm grandtec multi-capture card, but as we speak my hardware gurus > just built me a shiny pci card (yay!) - the 878 chips are only like 6 > dollars a piece apparently so I can get a 16 camera capture card for > sub 50 dollars! > > Thanks, > Kind Regards, > > > Matt Brocklehurst, > LookCCTV. > > Tel: 01253 891222 > Fax: 01253 891221 > Web: www.lookcctv.com > Email: matt@xxxxxxxxxxxx > > > > -----Original Message----- > From: Roger Oberholtzer [mailto:roger@xxxxxx] > Sent: 28 August 2003 12:51 > To: video4linux-list@xxxxxxxxxx > Subject: Re: Whats the best way of doing this! > > > Which card are you using for this? I have just such a need. I do not > need to keep the images, nor do I need a high rate. But, I would love > to get four images from one card! With, it seems, 4 connectors. > > On Thu, 28 Aug 2003 09:29:54 +0100 > "Matt Brocklehurst" <Matt.Brocklehurst@xxxxxxxxxxxx> wrote: > > > Hi, > > Ive managed to finally get my V4l program to get a semi-good > frame rate > > (4fps) over 4 cameras on a single chipped bt878 card - displaying this > > to screen no problem - however im at a loss how im going to dump the > > camera images to disk! Anyway ive tried the fps drops off to something > > icky (like 1fps). Any ideas/suggestions - source code would > be nice! Not > > too bothered about the format - as long as i can convert it at a later > > date to jpeg no problems, just want the fastest way of dumping the > > data. > > > > (Was thinking about threads - did attempt this but didnt seem to get > > anywhere :( ) > > > Threads are not necessarily faster. Depends on what you are up to. I > do jpeg compression in one application and that helps alot. However, > that is using a firewire digital camera providing YUV images. Still, > the application stupidly converts these to RGB before passing it to > the JPEG library, which I think converts them back (correction is on > todo list). And the system keeps up while doing a ton of other things. > We cheat and do not re-calculate the Huffman tables for each image. > That also helps decrease conversion time. > > What type of hard disk are you using? We use good SCSI disks for these > types of things. The performance improvement is noticeable. If you are > using IDE disks, the CPU conversion to JPEG may actually offset the > decreased data to be written. > > > > > -- > +····························+·······························+ > · Roger Oberholtzer · E-mail: roger@xxxxxx · > · OPQ Systems AB · WWW: http://www.opq.se/ · > · Erik Dahlbergsgatan 41-43 · Phone: Int + 46 8 314223 · > · 115 34 Stockholm · Mobile: Int + 46 733 621657 · > · Sweden · Fax: Int + 46 8 302602 · > +····························+·······························+ > > > -- > video4linux-list mailing list > Unsubscribe > mailto:video4linux-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/video4linux-list > > --- > Incoming mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.512 / Virus Database: 309 - Release Date: 19/08/2003 > > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.512 / Virus Database: 309 - Release Date: 19/08/2003 > > > > -- > video4linux-list mailing list > Unsubscribe > mailto:video4linux-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/video4linux-list > -- video4linux-list mailing list Unsubscribe mailto:video4linux-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/video4linux-list --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.512 / Virus Database: 309 - Release Date: 19/08/2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.512 / Virus Database: 309 - Release Date: 19/08/2003
