GStreamer-devel

v4lsrc: Could not synchronize on resource

Classic

List

Threaded

2 messages Options

Kristofor Amundson

v4lsrc: Could not synchronize on resource

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 ...

Thanks,

Kristofor

------------------------------------------------------------------------------
Download Intel® Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

Stefan Sauer

Re: v4lsrc: Could not synchronize on resource

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
>
>
>
> ------------------------------------------------------------------------------
> Download Intel® Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
>
>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel