Public bug reported:
Running on Ubuntu 18.04LTS
Have installed the v4l2loopback package and loaded the module. The
virtual device appears as /dev/video5
I attempt to use v4l2loopback-ctl to set the caps:
v4l2loopback-ctl set-caps "video/x-raw,format=UYVY, width=640,
height=480" /dev/video5
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
0:00:00.012052448 9986 0x55637bab2f70 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<videotestsrc0> error: Internal data stream
error.
0:00:00.012064227 9986 0x55637bab2f70 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<videotestsrc0> error: streaming stopped,
reason not-negotiated (-4)
ERROR: from element /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
Internal data stream error.
Additional debug info:
gstbasesrc.c(3055): gst_base_src_loop ():
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
output to /dev/video5 failed
In addition, I try and test the virtual device using the following
command:
gst-launch-1.0 -v v4l2src device=/dev/video5 ! fakesink
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
0:00:00.013335959 10118 0x555ee587ee30 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<v4l2src0> error: Internal data stream
error.
0:00:00.013361241 10118 0x555ee587ee30 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<v4l2src0> error: streaming stopped, reason
not-negotiated (-4)
New clock: GstSystemClock
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data
stream error.
Additional debug info:
gstbasesrc.c(3055): gst_base_src_loop ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming stopped, reason not-negotiated (-4)
Execution ended after 0:00:00.000044023
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
Finally, I try and pipe my webcam to the virtual device using the following
command:
gst-launch-1.0 v4l2src device=/dev/video3 !
video/x-raw,format=YUY2,width=640,height=480 ! v4l2sink
device=/dev/video5
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
0:00:00.082811522 10388 0x561d32c92680 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<v4l2src0> error: Internal data stream
error.
0:00:00.082833186 10388 0x561d32c92680 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<v4l2src0> error: streaming stopped, reason
not-negotiated (-4)
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data
stream error.
Additional debug info:
gstbasesrc.c(3055): gst_base_src_loop ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming stopped, reason not-negotiated (-4)
Execution ended after 0:00:00.000389218
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...
I'm guessing there is something I've either not set correctly or there is a bug
in this package. I've run with a higher debug level and I get the following:
0:00:00.090301723 10454 0x556e6bd34280 INFO v4l2
gstv4l2object.c:1196:gst_v4l2_object_fill_format_list:<v4l2sink0:sink> got 0
format(s):
0:00:00.090307845 10454 0x556e6bd34280 INFO v4l2
gstv4l2object.c:4136:gst_v4l2_object_probe_caps:<v4l2sink0:sink> probed caps:
EMPTY
0:00:00.090319527 10454 0x556e6bd34280 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<v4l2src0> error: Internal data stream
error.
0:00:00.090324467 10454 0x556e6bd34280 WARN basesrc
gstbasesrc.c:3055:gst_base_src_loop:<v4l2src0> error: streaming stopped, reason
not-negotiated (-4)
0:00:00.090335684 10454 0x556e6bd34280 INFO GST_ERROR_SYSTEM
gstelement.c:2145:gst_element_message_full_with_details:<v4l2src0> posting
message: Internal data stream error.
0:00:00.090354457 10454 0x556e6bd34280 INFO GST_ERROR_SYSTEM
gstelement.c:2172:gst_element_message_full_with_details:<v4l2src0> posted error
message: Internal data stream error.
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data
stream error.
** Affects: v4l2loopback (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1825863
Title:
ERROR: from element
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0: Internal data
stream error
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