[gst-devel] v4lsrc: Could not synchronize on resource

[Stefan Kost]

Am 12.02.2010 22:55, schrieb Kristofor Amundson:
> Hi all, 
> 
> I'm working on capturing media from a VGA signal grabber using
> gstreamer. It is a v4l device, so I am successfully able to capture
> using v4lsrc. I am having an issue with unplugging the VGA signal
> though, because the signal grabber does not send blank frames, so the
> gstreamer pipeline stops because it cannot synchronize on resource. Are
> there any options for me to somehow keep the pipeline running and just
> insert blank frames?
> 
> I am using GStreamer 0.10.25 and this is what the debugging output for
> the v4lsrc plugin looks like during the failure:
> 
> 0:00:12.858767651 15192       0xfa1f10 DEBUG                    v4l
> v4l_calls.c:386:gst_v4l_get_chan_norm:<v4lsrc0> getting current channel
> and norm
> 0:00:12.860111669 15192       0xfa1f10 LOG                      v4l
> v4lsrc_calls.c:690:gst_v4lsrc_buffer_finalize:<v4lsrc0> freeing buffer
> 0xe10e70 for frame 1
> 0:00:12.860159234 15192       0xfa1f10 LOG                      v4l
> v4lsrc_calls.c:694:gst_v4lsrc_buffer_finalize:<v4lsrc0> requeueing frame 1
> 0:00:12.860169350 15192       0xfa1f10 LOG                      v4l
> v4lsrc_calls.c:336:gst_v4lsrc_requeue_frame:<v4lsrc0> requeueing frame 1
> 0:00:12.998765970 15192       0xfa1f10 LOG                      v4l
> v4lsrc_calls.c:265:gst_v4lsrc_grab_frame:<v4lsrc0> grabbing frame
> 0:00:12.998815357 15192       0xfa1f10 LOG                      v4l
> v4lsrc_calls.c:84:gst_v4lsrc_queue_frame:<v4lsrc0> queueing frame 1
> 0:00:12.998829158 15192       0xfa1f10 LOG                      v4l
> v4lsrc_calls.c:114:gst_v4lsrc_sync_frame:<v4lsrc0> VIOIOCSYNC on frame 0
> 0:00:13.294936018 15192       0xfa1f10 WARN                     v4l
> v4lsrc_calls.c:124:gst_v4lsrc_sync_frame:<v4lsrc0> error: system error:
> No message of desired type
> ERROR: from element /GstPipeline:pipeline0/GstV4lSrc:v4lsrc0: Could not
> synchronize on resource.
> Additional debug info:
> v4lsrc_calls.c(124): gst_v4lsrc_sync_frame ():
> /GstPipeline:pipeline0/GstV4lSrc:v4lsrc0:
> system error: No message of desired type
> Execution ended after 12234652245 ns.
> Setting pipeline to PAUSED ...
> Setting pipeline to READY ...

v4l is deprecated, please try using v4l2 (via v4l2src) if there is no up-to-date
driver for your hardware you can try your luck with:

LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so <your-app>

Stefan

> 
> Thanks,
> 
> Kristofor
> 
> 
> 
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