Multiple camera on a laptop


    Jun 14 2006 | 10:58 pm
    I am trying to write a patch for a G4 15" laptop using Max 4.5.7 and Jitter 1.5. I want to have 5 cameras running on the same laptop. The cameras are porting in through a firewire hub that is powered.
    Ken ken@kennethfeinstein.com www.kennethfeinstein.com 646-220-8257

    • Jun 14 2006 | 11:13 pm
      On Jun 14, 2006, at 3:58 PM, Kenneth Feinstein wrote:
      > I am trying to write a patch for a G4 15" laptop using Max 4.5.7 > and Jitter 1.5. I want to have 5 cameras running on the same > laptop. The cameras are porting in through a firewire hub that is > powered.
      Depending on the camera type and resolution at which you are transitting he capture data o he computer, it sounds like you would probably saturate the FW bandwidth. I think you should be able to deliver 3xIIDC @ 640x480 streams per 400Mb/s FW port (a hub does you no good here as they all share the single port's BW). You might investigate PCI slots which provide additional FW ports. However you'll also have to investigate saturating the PCI bandwidth and deal with CPU overhead, perhaps resulting in less than applicable framerates. Your application might require using multiple computers.
      Here's an Apple Tech note on the subject: http://developer.apple.com/qa/qa2004/qa1365.html
      More info by googling on IIDC bandwidth.
      -Joshua
    • Jun 15 2006 | 10:44 am
      see unibrain support page http://unibrain.com/download/pdfs/Fire-i_Board_Cams/camera_b ytes_pkts_3Public.pdf
      ptgrey has lots of knowledgebase articles http://www.ptgrey.com/support/kb/index.asp?a=4&q=22& ST=bandw idth
    • Jun 16 2006 | 5:15 pm
      i used - with success - 4 FW cameras on a Pb titanium (1 giga)
      those were unibrains, daisy chained, without being powered (other than the FW port)
      since i did not encounter any special problems (the rest of the jitter patch was pretty simple - just pick at random one of the 4 images and send this to the 2nd screen for a duration chosen at random between x
      best
      kasper -- Kasper T. Toeplitz noise, composition, bass, computer http://www.sleazeArt.com