At the end, I'm telling a bug...
El 23/04/15 a las 12:14, IOhannes m zmoelnig escibió:
On 2015-04-23 15:51, Mario Mey wrote:
Well, I don't know if I was on 'video' group but I did the addition. I
checked the file you sent me and it works. However, for the moment, I
have 3 questions:
- If I don't activate the device in the right side of the patch, nor
Blender nor VLC can get the image from /dev/video1 (VLC shows errors on
console, Blender says nothing, but it makes black texture) Why is like
that? Supposedly, being pix_record there and activated, I should get
from where I want...
this could have a multitude of reasons.
i would suggest first checking what those errors are that VLC throws
(chances are they mean something).
then try using gstreamer(-0.10!) to display the video. something like:
$ gst-launch0.10 v4l2src device=/dev/video1 ! ffmpegcolorspace !
xvimagesink
After some tests (including using gst-launch0.10)... I realized that I
was wrong. Blender and VLC can read from /dev/video1 without activating
it on Pd.
But... I need to create gemwin before VLC or Blender or Gstreamer. Is
this normal? Should I need gem window opened? It is for gemhead to make
gemlists... isn't it?
- Look at the attached image: why the video is vertically inverted? I
don't know about GEM, but I didn't find any object that do that.
it's the olde discrepancy between openGL image coordinates (starting in
the lower left corner) and most other pixel coordinates (starting in the
upper left corner), and a small bug in the old recordV4L2 implementation
of Gem (which should be fixed in recent git).
iirc putting a [pix_flip] before [pix_record] might fix the problem.
[pix_flip] does the trick.
anyhow, this means that the v4l2loopback output is working.
so that leaves two more potential candidates for your*problem*:
Do you mean the Blender and VLC getting "problem"? It is resolved.
Well... maybe it never was there.
- the v4l2loopback kernel module (there are some known issues with e.g.
gstreamer-1.0; which version are you using?)
I didn't know I had gstreamer installed on the system. I have 1.0 and 0.10.
- the consumer applications (blender/vlc): while working on the
v4l2loopback module i noticed that quite a number of v4l2 applications
make unjustified assumptions about the v4l2 device, which sometimes are
not satisfied by v4l2loopback. (like refusing to work when the card_name
does not match the device-name...)
Blender and VLC get the video correctly.
- How the patch should be if I want to send the GEM window to loopback?
I mean, not only the color and vertical inverted video, but the whole
window...
checkout [pix_snap] to fetch a framebuffer into pixes.
I'll check it later.
fgasm
IOhannes
Using the patch from Antoine, when I click in [device /dev/video1( from
the right side of the patch, the rectangle with the video appears. But
when I try to close Pd, it freezes. I have to kill it. I tried some
things with no success:
- Remove pix_record before closing
- Send record 0 to pix_record before closing.
Is this a bug?
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