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    Hello,
    
    Le 22/08/2013 21:03, IOhannes zmölnig a écrit :
    > On 08/22/2013 08:40 PM, Jack
      wrote:
      >>
      >> $ cat /sys/devices/virtual/video4linux/video1/format
      >> GREY?30:1280x1024@30
      >>
      >> I expect 60 fps.
      >> If i set :
      >> $ v4l2-ctl -d /dev/video1 -p 60
      >> or
      >> $ v4l2-ctl -d /dev/video1 -p 1
      >> It doesn't change anything.
      >> Do you know if there is a possibility to get this frame
      rate (60 fps) ?
      >> Is it a limitation using videoloopback ?
      >
      > no.
      > v4l2loopback does not know nor care about frames or formats.
      > it simply passes the frames from one application to another.
      there is no
      > colorspace-conversion of resampling or the like involved.
    OK.
    >
      >
      >
      > it's gstreamer that doesn't set the framerate correctly.
      >
      > you could force it by running:
      >  $ echo "@60" | sudo tee
      /sys/devices/virtual/video4linux/video1/format
      >
      > in practice i don't think that this framerate setting will do
      much.
    Yes, it doesn't change anything.
    >
      >
      >
      >> For info, i get 60 fps when I use the application
      streamViewer.
      >
      > how do you know?
    It is written in the top window border : "Acquisition [ cptured:
    2854, skipped: 1, fps : 61.40 ]"
    Seeing the video capture in the Gem window, i guess it is at 60 fps.
    So, in this case, information about framerate return by :
    $ v4l2-ctl --all -d /dev/video1
    or
    $ cat /sys/devices/virtual/video4linux/video1/format
    is incorrect.
    Thank you for your help IOhannes, now I can get the stream from a
    XIMEA camera in Gem.
    Do you think, it will be much better/faster/stable to get a v4l2
    driver from XIMEA than to use a pipe with gstreamer/v4l2loopback ?
    ++
    
    Jack
    
    
    >
      >
      > fdsmard
      > IOhannes
      >
      >
      >
      > _______________________________________________
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