[Bug 770308] v4l2src: "device busy" error when setting to READY and back to PLAYING

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770308

--- Comment #2 from frank <dasimazn at 163.com> ---
Created attachment 334066
  --> https://bugzilla.gnome.org/attachment.cgi?id=334066&action=edit
this debug information

 hi:
    I set null and voido_pending state ,all the is same questions,so i submit
debug.txt,please tell me how to take this problem,thank you.

debug error info:
v4l2 gstv4l2object.c:2524:gst_v4l2_object_set_format:<v4l2src0>[00m error:
Device '/dev/video0' is busy
0:00:07.581130165 [336m 2837[00m    0xe5a60 [33;01mWARN   [00m [00m       
        v4l2 gstv4l2object.c:2524:gst_v4l2_object_set_format:<v4l2src0>[00m
error: Call to S_FMT failed for YV12 @ 1280x720: Device or resource busy
0:00:07.581208331 [336m 2837[00m    0xe5a60 [36mINFO   [00m [00;01;31;47m 
  GST_ERROR_SYSTEM gstelement.c:1835:gst_element_message_full:<v4l2src0>[00m
posting message: Device '/dev/video0' is busy
0:00:07.581292665 [336m 2837[00m    0xe5a60 [36mINFO   [00m [00;01;31;47m 
  GST_ERROR_SYSTEM gstelement.c:1858:gst_element_message_full:<v4l2src0>[00m
posted error message: Device '/dev/video0' is busy
0:00:07.581399748 [336m 2837[00m    0xe5a60 [33;01mWARN   [00m [00m       
     basesrc gstbasesrc.c:2865:gst_base_src_loop:<v4l2src0>[00m error:
Internal data flow error.
0:00:07.581442498 [336m 2837[00m    0xe5a60 [33;01mWARN   [00m [00m       
     basesrc gstbasesrc.c:2865:gst_base_src_loop:<v4l2src0>[00m error:
streaming task paused, reason not-negotiated (-4)

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