1 webcam on two computers


    Jun 14 2006 | 3:12 pm
    Hi all,
    I need to project the images from one webcam to two beamers.
    Each beamer is connected to one powerbook.
    I've never done this before.
    I thought i'd use the udpsend and udp receive objects.
    If i plug the output of jit.qt.grab to a udpsend object and plug the
    corresponding udp receive to a jit.window on the
    other computer, max complains and says :
    jit.window : couldn't get matrix object
    I guess it's because it's on the other computer but...
    what should i do ?
    Can you help ?
    Thanks.

    • Jun 14 2006 | 3:21 pm
      You should use jit.net.send/recv for sending video. Depending on your
      network and video size, you might want to convert it to uyuv before
      sending.
      wes
    • Jun 14 2006 | 3:33 pm
      yeah thanks, that's what i understood...
      The only thing is that i don't have jitter 1.5 here...
      Do you think it's possible without loosing image quality ?
      Otherwise... i'll have to get Jitter 1.5...
      Thanks
    • Jun 14 2006 | 4:19 pm
      if you're pre-1.5, there is also the jit.bixcp object set,
      if I remember correctly they only send 1 plane matrices, but you can
      glue the planes together and cut them loose after receiving, depending
      on the size you need: there's a limitation to the maximum matrix size
      having to do with the maximum size of the packets you can send, but
      there's all kinds of workarounds possible (sending r, g, b seperately,
      cutting your matrix to pieces and assembling them etc.)
      good luck,
      Joost.
      -------------------------------------------
      Joost Rekveld
      -------------------------------------------
      "The mystery of the world is the visible, not the invisible"
      (Oscar Wilde)
      -------------------------------------------
    • Jun 14 2006 | 11:19 pm
      On 14-Jun-2006, at 18:19, Joost Rekveld wrote:
      > if you're pre-1.5, there is also the jit.bixcp object set,
      > for download at http://www.bix.at/software/main_tools.html
      >
      > if I remember correctly they only send 1 plane matrices, but you
      > can glue the planes together and cut them loose after receiving,
      > depending on the size you need
      A few comments from the developer...
      BIXCP is indeed a grayscale (in Jitter-speak: single plane) protocol.
      The original jit.bixcp objects had an additional limitation based on
      the hardware used for the "Medienfassade" at the Graz Kunsthaus (for
      which BIXCP was designed). The Medienfassade was 64x25. Mind you,
      those were *big* pixels.
      The maximum pixel count was raised to just over 32,000 in the
      commercial versions of the BIXCP objects, distributed with the Litter
      Bundle for Jitter. The limitation was actually based on the maximum
      amount of memory that Max could allocate on the fly at the time the
      bixcp objects were ported to Windows. If there were a demand it would
      now, I think, be possible to double that upper bound.
      Hope this information is of use.
      Best,
      Peter
      -------------- http://www.bek.no/~pcastine/Litter/ -------------
      Peter Castine +--> Litter Power & Litter Bundle for Jitter
      iCE: Sequencing, Recording & |home | chez nous|
      Interface Building for |bei uns | i nostri|
      Max/MSP Extremely cool http://www.castine.de
    • Jun 15 2006 | 9:36 am
      fire-i camera can send to 2 powerbooks at the same time (has 2 firewire
      ports)
      wojciech
    • Jun 15 2006 | 10:37 am
      unibrain is excellent, its worth the 100$
      full control from max (mac only)
      screw mounted lens
      daisy chain passthrough
      i also bought a 10m cable from them.
      i haven't tried sending it to 2 outputs. from what i understand the
      second firewire port on the unibrain is a pass through.
      Kosma, have you tried this?
      also, unibrain cameras can get there power from the firewire port or
      from external dc , is power over firewire available on a powerbook FW
      port?
    • Jun 16 2006 | 12:43 am
      Hello,
      Only one cpu can grab it at a time. Its fun battling for it by
      stopping and starting jit.qt.grab on the respective machines, but its
      an either or not simultaneous proposition.
      Barney
    • Jun 16 2006 | 9:59 am
      yes, as i said it works for 2 computers,
      at least for me...
      wojciech