multiple Firewire cameras and jit.qt.grab


    Dec 19 2007 | 3:33 pm
    Happy Holidays, everybody!
    I am trying to open two Firewire cameras (a Canon GL2 and a Panasonic DVX100) at the same time with two jit.qt.grab objects. I am using a Kramer 4-port FW hub since the MacBook Pro has only one FW input.
    Last night I was unable to open both at once but could open each independently. (I know that you have to use the IIDC FireWire driver) for this to work. It went something like this:
    * plug in both cameras * open a [jit.qt.grab], select the IIDC Firewire Video driver, select one camera (both showed up in the input list). * send "open" to the second grab object. Despite selecting the IIDC driver, the other camera would not show up in the input list. I got an error message in the Max window, which, er, I did not save. (It was in the heat of battle just before the show....) It was one of the standard jit.qt.grab errors I've seen before. :-/
    I also tried plugging in and opening the cameras one at a time. No luck. Also tried opening one of the cameras with the DV driver to see if that would let me open the other with IIDC -- no luck.
    I won't have access to both cameras again until January. In the meantime, any suggestions to get this working -- besides "get a mixer" -- would be much appreciated. Thanks!
    dan

    • Dec 19 2007 | 4:16 pm
      I think that you need IIDC compatible camera, And as fire as i know each camera needs to be on its own firewire port (chip), hub might not be the right solution. Hope others will correct me if I`m wrong.
    • Dec 19 2007 | 5:54 pm
      Perhaps I should start a new topic, don't know, sorry Dan ...
      I have a difficulties with an Sony Handycam HDV 1080i the "getdevlist" message to [jit.qt.grab] gives me good options :
      "DVCPRO HD (1080i50)", "DVCPRO HD (1080i60)", "DVCPRO HD (720p60)", "DV Video", "IIDC FireWire Video", "USB Video Class Video"
      but impossible to "open" [jit.qt.grab] :
      ? error: jit.qt.grab: could not create video channel -9405 ? error: jit.qt.grab: error opening device for grab. print: open -1 0
    • Dec 19 2007 | 6:38 pm
      I use a firewire hub to connect 2 fire-i and 1 dfg box to my macbook pro without problems. martin
      Am 19.12.2007 17:16 Uhr schrieb "jasmin" unter :
      > > I think that you need IIDC compatible camera, > And as fire as i know each camera needs to be on its own firewire port (chip), > hub might not be the right solution. > Hope others will correct me if I`m wrong. > -- > jaz >
    • Dec 19 2007 | 7:01 pm
      On Dec 19, 2007, at 9:54 AM, Derrick Giscloux wrote:
      > > Perhaps I should start a new topic, don't know, sorry Dan ...
      Yes. You should start a new topic in the future.
      > I have a difficulties with an Sony Handycam HDV 1080i > the "getdevlist" message to [jit.qt.grab] gives me good options : > > "DVCPRO HD (1080i50)", "DVCPRO HD (1080i60)", "DVCPRO HD (720p60)", > "DV Video", "IIDC FireWire Video", "USB Video Class Video" > > but impossible to "open" [jit.qt.grab] :
      HDV is *not* DVCPro HD. Unless it changed in recent QT releases, no HDV input is supported in Quicktime at least on Tiger (iMovie and FinalCut use a private, not QuickTime framework for grabbing HDV streams). I've heard some reports from users about there being HDV quicktime components in Leopard, but that they don't show up or work in Jitter. Nothing on our side will happen for this in Jitter 1.6.x, but we can look into it for Jitter 1.7 (Max 5 compatibility release) if it is exposed to non Apple applications. I haven't had time to research this as core Max 5 work is the current priority.
      In the meantime, if you have an HDV camera, and your camera has HDMI or component HD output, your best bet is to use a blackmagic intensity pro card. They are cheap and offer better than HDV quality (avoids the low chroma sampling and high spatial and temporal compression of HDV as long as the camera sends the datastream prior it's internal application of chroma down sampling and compression). The only downside is that you need a desktop with PCI slots. If you only need HDMI, I believe the original (no "pro") version might be cheaper.
      -Joshua
    • Dec 19 2007 | 8:59 pm
      I use a firewire hub to connect 2 fire-i and 1 dfg box to my macbook pro without problems. martin
      Am 19.12.2007 17:16 Uhr schrieb "jasmin" unter :
      > > I think that you need IIDC compatible camera, > And as fire as i know each camera needs to be on its own firewire port (chip), > hub might not be the right solution. > Hope others will correct me if I`m wrong. > -- > jaz >
      but can you grab 2 cams at the same time with firewire hub?
    • Dec 19 2007 | 11:48 pm
      yes if they are iidc or you can use 2 dfg boxes...
      ----- Original Message ---- From: jasmin Sent: Wednesday, December 19, 2007 3:59:41 PM Subject: [jitter] Re: multiple Firewire cameras and jit.qt.grab
      I use a firewire hub to connect 2 fire-i and 1 dfg box to my macbook pro without problems. martin
      Am 19.12.2007 17:16 Uhr schrieb "jasmin" unter :
      > > I think that you need IIDC compatible camera, > And as fire as i know each camera needs to be on its own firewire port (chip), > hub might not be the right solution. > Hope others will correct me if I`m wrong. > -- > jaz >
      but can you grab 2 cams at the same time with firewire hub? -- jaz
    • Dec 19 2007 | 11:54 pm
      those 2 cameras are DV cameras not IIDC cameras - so you can only use one at a time...
      the IIDC driver is not for DV cameras but for ICD cameras - which don't send a DV stream in
      so no - you don't have to buy a mixer but you might want to look at some different cameras or a 1394imaging dfg box
      I have used the fire-i camera extensively and have been happy with them... they used to cost around $100... and if you get the 'board' version you can switch which lens you are using - helpful if you need different lenses for different applications...
      good luck jamie
      ----- Original Message ---- From: Dan Winckler Sent: Wednesday, December 19, 2007 10:33:57 AM Subject: [jitter] multiple Firewire cameras and jit.qt.grab
      Happy Holidays, everybody!
      I am trying to open two Firewire cameras (a Canon GL2 and a Panasonic DVX100) at the same time with two jit.qt.grab objects. I am using a Kramer 4-port FW hub since the MacBook Pro has only one FW input.
      Last night I was unable to open both at once but could open each independently. (I know that you have to use the IIDC FireWire driver) for this to work. It went something like this:
      * plug in both cameras * open a [jit.qt.grab], select the IIDC Firewire Video driver, select one camera (both showed up in the input list). * send "open" to the second grab object. Despite selecting the IIDC driver, the other camera would not show up in the input list. I got an error message in the Max window, which, er, I did not save. (It was in the heat of battle just before the show....) It was one of the standard jit.qt.grab errors I've seen before. :-/
      I also tried plugging in and opening the cameras one at a time. No luck. Also tried opening one of the cameras with the DV driver to see if that would let me open the other with IIDC -- no luck.
      I won't have access to both cameras again until January. In the meantime, any suggestions to get this working -- besides "get a mixer" -- would be much appreciated. Thanks!
      dan
    • Dec 20 2007 | 2:58 pm
      thanks for the feedback, Jamie. If true, it's disappointing that these cameras can't be used with the IIDC driver. Do you know if this is true of all miniDV cameras?
      It would be helpful if jit.qt.grab had a couple more explanatory error messages. For example, it would be nice if sending "open, vdevice IIDC Firewire Video, input [your DV camera]" to jit.qt.grab returned an error like "selected input device cannot be used with the selected driver: IIDC".
      -----Original Message----- From: jamie jewett
      Date: Wed, 19 Dec 2007 15:54:17 Subject: Re: [jitter] multiple Firewire cameras and jit.qt.grab
      those 2 cameras are DV cameras not IIDC cameras - so you can only use one at a time...
      the IIDC driver is not for DV cameras but for ICD cameras - which don't send a DV stream in
      so no - you don't have to buy a mixer but you might want to look at some different cameras or a 1394imaging dfg box
      I have used the fire-i camera extensively and have been happy with them... they used to cost around $100... and if you get the 'board' version you can switch which lens you are using - helpful if you need different lenses for different applications...
      good luck jamie
      ----- Original Message ---- From: Dan Winckler Sent: Wednesday, December 19, 2007 10:33:57 AM Subject: [jitter] multiple Firewire cameras and jit.qt.grab
      Happy Holidays, everybody!
      I am trying to open two Firewire cameras (a Canon GL2 and a Panasonic DVX100) at the same time with two jit.qt.grab objects. I am using a Kramer 4-port FW hub since the MacBook Pro has only one FW input.
      Last night I was unable to open both at once but could open each independently. (I know that you have to use the IIDC FireWire driver) for this to work. It went something like this:
      * plug in both cameras * open a [jit.qt.grab], select the IIDC Firewire Video driver, select one camera (both showed up in the input list). * send "open" to the second grab object. Despite selecting the IIDC driver, the other camera would not show up in the input list. I got an error message in the Max window, which, er, I did not save. (It was in the heat of battle just before the show....) It was one of the standard jit.qt.grab errors I've seen before. :-/
      I also tried plugging in and opening the cameras one at a time. No luck. Also tried opening one of the cameras with the DV driver to see if that would let me open the other with IIDC -- no luck.
      I won't have access to both cameras again until January. In the meantime, any suggestions to get this working -- besides "get a mixer" -- would be much appreciated. Thanks!
      dan