Hello,

The answer about v4l2 driver for xiQ camera from Ximea :

Dear Mr.Jack,

Based on information of our linux implementation specialist we are not planning implementation of v4l2 because it is quite complicated task and there are no big potential from current customers.

Probably gstreamer interface would be simpler for implementation, but unfortunately also this interface is not in our plan pipeline.

Best regards

Hello,

    I have a xiQ camera and test it on my Ubuntu. It works well with streamViewer provided by your staff.
    But for a lot of people working under linux platform like me, it would be very nice to use v4l2 driver. This is free/open and a standard on linux.
    Are you working on this solution (to make v4l2 driver for your xiQ USB3.0 camera) ?
    Best!
    ++

Jack

For peole interested in the xiQ cameras : Ximea API/Gstreamer have worked during more 24 hours without problem on my computer (Ubuntu 12.04, kernel 3.8, gstreamer 0.10).
I run into trouble (i get a crash after more or less 2 hours) when i tried to modify the code to get Gstreamer working with v4l2sink/v4l2loopback/[pix_video], but my skill in C++ are to bad to get things stable...
++

Jack

Le 23/08/2013 12:17, Jack a écrit :
>

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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