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gst1.0-fsl-plugin 4.0.2/4.0.3-r0 bug imxv4l2src

Question asked by Andrew Murray on Jul 14, 2015
Latest reply on Mar 2, 2016 by chris whittenburg

 

I have found an issue/bug with the GStreamer 1.0 implementation of imxv4l2src, I'm looking for a solution and more generally to understand the correct place to post such bugs/questions.

 

I have created a very simple gst1.0 application based on input-selector-test.c example, modified such that the pipeline looks like this:

 

imxv4l2src ! caps ! valve ! imxv4l2sink

 

The application changes the state of the valve from drop=false to drop=true after a specified number of seconds. Unfortunately this results in the following error:

 

** Message: Valve is now set to drop

0:00:12.083723335   712   0x3ff260 ERROR             imxv4l2src

gst1.0-fsl-plugin/4.0.2-r0/gst1.0-fsl-plugins-4.0.2/plugins/v4l2/gstimxv4l2src.c:463:gst_imx_v4l2src_decide_allocation:<src1>

using v4l2 source allocator.

0:00:12.487820001   712   0x3ff260 ERROR                imxv4l2

gst1.0-fsl-plugin/4.0.2-r0/gst1.0-fsl-plugins-4.0.2/libs/v4l2_core/gstimxv4l2.c:1429:gst_imx_v4l2_allocate_buffer:

No more v4l2 buffer for allocating.

0:00:12.488049335   712   0x3ff260 ERROR                imxv4l2

gst1.0-fsl-plugin/4.0.2-r0/gst1.0-fsl-plugins-4.0.2/libs/v4l2_core/gstimxv4l2.c:1429:gst_imx_v4l2_allocate_buffer:

No more v4l2 buffer for allocating.

0:00:12.492420668   712   0x3ff260 ERROR                imxv4l2

gst1.0-fsl-plugin/4.0.2-r0/gst1.0-fsl-plugins-4.0.2/libs/v4l2_core/gstimxv4l2.c:1398:gst_imx_v4l2_find_buffer:

Can't find the buffer 0x766EF508.

0:00:12.492524001   712   0x3ff260 ERROR             imxv4l2src

/gst1.0-fsl-plugin/4.0.2-r0/gst1.0-fsl-plugins-4.0.2/plugins/v4l2/gstimxv4l2src.c:586:gst_imx_v4l2src_acquire_buffer:<src1>

Queue buffer 0x75c09db8 failed.

0:00:12.492610335   712   0x3ff260 WARN                 basesrc

gstreamer1.0/1.4.1-r0/gstreamer-1.4.1/libs/gst/base/gstbasesrc.c:2933:gst_base_src_loop:<src1>

error: Internal data flow error.

0:00:12.492679335   712   0x3ff260 WARN                 basesrc

gstreamer1.0/1.4.1-r0/gstreamer-1.4.1/libs/gst/base/gstbasesrc.c:2933:gst_base_src_loop:<src1>

error: streaming task paused, reason error (-5)

Got error message

Error: Internal data flow error.

 

(video:712): GStreamer-CRITICAL **: gst_mini_object_unref: assertion 'mini_object->refcount > 0' failed

0:00:12.493453335   712   0x400ee0 ERROR                imxv4l2

gst1.0-fsl-plugin/4.0.2-r0/gst1.0-fsl-plugins-4.0.2/libs/v4

l2_core/gstimxv4l2.c:1398:gst_imx_v4l2_find_buffer: Can't find the buffer 0x00000000.

 

 

Using gst1.0-fsl-plugin/4.0.3-r0 also results in this similar error:

 

** Message: Valve is now set to drop

0:00:12.386593002   750  0x1eb8460 ERROR                imxv4l2

gst1.0-fsl-plugin/4.0.3-r0/gst1.0-fsl-plugins-4.0.3/libs/v4l2_core/gstimxv4l2.c:1452:gst_imx_v4l2_allocate_buffer:

No more v4l2 buffer for allocating.

0:00:12.386899668   750  0x1eb8460 ERROR                imxv4l2

gst1.0-fsl-plugin/4.0.3-r0/gst1.0-fsl-plugins-4.0.3/libs/v4l2_core/gstimxv4l2.c:1452:gst_imx_v4l2_allocate_buffer:

No more v4l2 buffer for allocating.

0:00:12.387092668   750  0x1eb8460 ERROR                imxv4l2 ERROR:

v4l2 capture: VIDIOC_QBUF: buffer already

queuedgst1.0-fsl-plugin/4.0.3-r0/gst1.0-fsl-plugins-4.0.3/libs/v4l2_core/gstimxv4l2.c:1452:gst_imx_v4l2_allocate_buffer:

No more v4l2 buffer for allocating.

0:00:12.387223335   750  0x1eb8460 ERROR                imxv4l2

gst1.0-fsl-plugin/4.0.3-r0/gst1.0-fsl-plugins-4.0.3/libs/v4l2_core/gstimxv4l2.c:1452:gst_imx_v4l2_allocate_buffer:

No more v4l2 buffer for allocating.

0:00:12.455394002   750  0x1eb8460 WARN                 imxv4l2

gst1.0-fsl-plugin/4.0.3-r0/gst1.0-fsl-plugins-4.0.3/libs/v4l2_core/gstimxv4l2.c:1686:gst_imx_v4l2_queue_gstbuffer:

new buffer (0x75c09e58) use the same memblk(0x75004a64) with queued buffer(0x75c09958)

0:00:12.455493668   750  0x1eb8460 WARN                 imxv4l2

gst1.0-fsl-plugin/4.0.3-r0/gst1.0-fsl-plugins-4.0.3/libs/v4l2_core/gstimxv4l2.c:1689:gst_imx_v4l2_queue_gstbuffer:

gstbuffer(0x75c09958) for (0x7696c750) not dequeued yet but queued again, index(1975556440).

0:00:12.461249002   750  0x1eb8460 ERROR                imxv4l2

gst1.0-fsl-plugin/4.0.3-r0/gst1.0-fsl-plugins-4.0.3/libs/v4l2_core/gstimxv4l2.c:1571:imx_v4l2_do_queue_buffer:

queue v4l2 buffer failed.

0:00:12.461293335   750  0x1eb8460 ERROR                imxv4l2

gst1.0-fsl-plugin/4.0.3-r0/gst1.0-fsl-plugins-4.0.3/libs/v4l2_core/gstimxv4l2.c:1693:gst_imx_v4l2_queue_gstbuffer:

queue gstbuffer (0x75c09e58) failed.

 

(video:750): GStreamer-CRITICAL **: gst_buffer_get_meta: assertion 'buffer != NULL' failed

(video:750): GStreamer-CRITICAL **: gst_buffer_add_meta: assertion 'buffer != NULL' failed

 

 

I believe the change in 'drop' state results in a reconfigure event reaching imxv4l2src which it doesn't appear to handle correctly. Replacing imxv4l2src with videotestsrc results in the expected behaviour when the valve is set to drop.

 

Furthermore, when modifying gstimxv4l2src.c to override the default GST_EVENT_RECONFIGURE event such that it only clears the event (gst_pad_check_reconfigure) it then works as expected.

 

This appears to be a bug - has this been seen before or already fixed?

 

Are there any suggestions for the correct way of fixing this?

 

Is there a mailing list for this component or a place to contribute/question/discuss?

 

Andrew Murray

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