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List:       gstreamer-devel
Subject:    Re: Compositor pipeline ending unexpectedly (gst_v4l2_buffer_pool_poll())
From:       Nicolas Dufresne <nicolas () ndufresne ! ca>
Date:       2021-01-26 19:26:03
Message-ID: 20893d33624a3e077ad90483b01a15e7d46a1e11.camel () ndufresne ! ca
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Le jeudi 21 janvier 2021 à 06:32 -0600, janoglezcampos a écrit :
> Hello everyone,
> 
> I'm trying to do something I think is simple, but is driving me crazy.
> The thing is that i want to composite 2 v4l2src into one single stream, but
> after a while playing, it stops. The strange part, is that this only happens
> when i add both sources, if i test them one by one, the problem disappears,
> so that make me think that the problem should be with synchronizations or
> timestamps.
> 
> *Pipeline:*
> > gst-launch-1.0 -v compositor name=comp \
> sink_0::xpos=0 sink_0::ypos=0 \
> sink_1::xpos=512 sink_1::ypos=0 ! \
> "video/x-raw, width=1280, height=720" ! queue ! glimagesink \
> v4l2src device=/dev/video2 ! queue leaky=downstream !
> image/jpeg,width=1280,height=720,framerate=30/1 ! jpegdec ! queue !
> videoconvert ! videorate ! videoscale !
> video/x-raw,width=512,height=354,framerate=30/1 ! comp.sink_0 \
> v4l2src device=/dev/video0 ! queue leaky=downstream !
> image/jpeg,width=1280,height=720,framerate=30/1 ! jpegdec ! queue !
> videoconvert ! videorate ! videoscale !
> video/x-raw,width=512,height=354,framerate=30/1 ! comp.sink_1
> 
> *Result:*
> ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Could not
> read from resource.
> Additional debug info:
> gstv4l2bufferpool.c(1126): gst_v4l2_buffer_pool_poll ():
> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> poll error 1: Invalid argument (22)

poll() (or select() in this case) will only return this error if the file
descriptor was closed. As this is not going to happen at runtime in GStreamer, I
would suspect that it's done by the driver behind our back. You might get more
details with "GST_DEBUG=v4l2*:7" (or too much detail).

Meanwhile, I would also inspect your kernel log for possible driver issues.
Notably, UVC driver will reset and invalidate FDs when the UVC firmware crash or
stops responding.

> Execution ended after 0:03:35.703160250
> Setting pipeline to PAUSED ...
> Setting pipeline to READY ...
> Setting pipeline to NULL ...
> Freeing pipeline ...
> Xlib:  extension "NV-GLX" missing on display ":1".
> 
> Does someone knows what Im missing?? I cant make it work, I tried setting
> do-timestamps and sync=false, but nothing seems to work... 
> Thank you for your time.
> 
> 
> 
> 
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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