[Bug 758060] gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758060

--- Comment #1 from bill-auger <bill-auger at programmer.net> ---
Comment on attachment 315406
  --> https://bugzilla.gnome.org/attachment.cgi?id=315406
minimal pipeline exposing this bug

>/*
>   g++ `pkg-config --cflags gstreamer-1.0`    ./pngdec.cpp \
>       `pkg-config --libs   gstreamer-1.0` -o ./pngdec
>*/
>
>#include <gst/gst.h>
>#include <stdio.h>
>#include <unistd.h>
>
>
>GstElement *Pipeline , *ImageBin , *CompositorBin ;
>
>
>bool newGhostPad(GstElement* a_bin         , GstElement*  an_element ,
>                 const gchar* pad_template , const gchar* public_id  )
>{
>  GstPad *private_pad , *public_pad ;
>
>  bool is_err = !(private_pad = gst_element_get_static_pad(an_element , pad_template)) ||
>                !(public_pad  = gst_ghost_pad_new         (public_id  , private_pad )) ||
>                !gst_pad_set_active(public_pad , TRUE)                                  ;
>  gst_object_unref(private_pad) ;
>
>  if (is_err || a_bin == NULL|| !gst_element_add_pad(a_bin , public_pad))
>    return false ;
>
>  return true ;
>}
>
>int configureImageBin()
>{
>#define IMAGE_W          "640"
>#define IMAGE_H          "480"
>#define IMAGE_FILENAME   "a.png"
>#define SCALER_CAPS_STR  "video/x-raw, "                        \
>                         "width=(int)"IMAGE_W", "               \
>                         "height=(int)"IMAGE_H", "              \
>                         "framerate=(fraction)0/1, "            \
>                         "format=(string)YUY2,"                 \
>                         "interlace-mode=(string)progressive, " \
>                         "pixel-aspect-ratio=(fraction)1/1"
>#define FREEZER_CAPS_STR "video/x-raw, "                        \
>                         "width=(int)"IMAGE_W", "               \
>                         "height=(int)"IMAGE_H", "              \
>                         "framerate=(fraction)8/1, "            \
>                         "format=(string)YUY2,"                 \
>                         "interlace-mode=(string)progressive, " \
>                         "pixel-aspect-ratio=(fraction)1/1"
>
>
>  GstElement *source  , *decoder        , *converter ,
>             *scaler  , *scaler_filter  ,
>             *freezer , *freezer_filter , *queue ;
>  GstCaps    *scaler_caps , *freezer_caps ;
>
>  // instantiate elements
>  if (!(source         = gst_element_factory_make("filesrc"      , "image-real-source" )) ||
>      !(decoder        = gst_element_factory_make("pngdec"       , "image-decoder"     )) ||
>      !(converter      = gst_element_factory_make("videoconvert" , "image-converter"   )) ||
>      !(scaler         = gst_element_factory_make("videoscale"   , "image-scaler"      )) ||
>      !(scaler_filter  = gst_element_factory_make("capsfilter"   , "image-scaler-caps" )) ||
>      !(freezer        = gst_element_factory_make("imagefreeze"  , "image-freezer"     )) ||
>      !(freezer_filter = gst_element_factory_make("capsfilter"   , "image-freezer-caps")) ||
>      !(queue          = gst_element_factory_make("queue"        , "image-queue"       )) ||
>      !(scaler_caps    = gst_caps_from_string(SCALER_CAPS_STR )                         ) ||
>      !(freezer_caps   = gst_caps_from_string(FREEZER_CAPS_STR)                         )  )
>  { printf("IMAGE_BIN_INIT_ERROR_MSG\n") ; return false ; }
>
>  // configure elements
>  g_object_set(G_OBJECT(source        ) , "location"         , IMAGE_FILENAME , NULL) ;
>  g_object_set(G_OBJECT(scaler_filter ) , "caps"             , scaler_caps    , NULL) ;
>  g_object_set(G_OBJECT(freezer_filter) , "caps"             , freezer_caps   , NULL) ;
>  g_object_set(G_OBJECT(queue         ) , "max-size-bytes"   , (guint)0       , NULL) ;
>  g_object_set(G_OBJECT(queue         ) , "max-size-time"    , (guint64)0     , NULL) ;
>  g_object_set(G_OBJECT(queue         ) , "max-size-buffers" , (guint)0       , NULL) ;
>  gst_caps_unref(scaler_caps) ; gst_caps_unref(freezer_caps) ;
>
>  // link elements
>  if (!gst_bin_add(GST_BIN(ImageBin) , source        )        ||
>      !gst_bin_add(GST_BIN(ImageBin) , decoder       )        ||
>      !gst_bin_add(GST_BIN(ImageBin) , converter     )        ||
>      !gst_bin_add(GST_BIN(ImageBin) , scaler        )        ||
>      !gst_bin_add(GST_BIN(ImageBin) , scaler_filter )        ||
>      !gst_bin_add(GST_BIN(ImageBin) , freezer       )        ||
>      !gst_bin_add(GST_BIN(ImageBin) , freezer_filter)        ||
>      !gst_bin_add(GST_BIN(ImageBin) , queue         )        ||
>      !gst_element_link(source         , decoder       )      ||
>      !gst_element_link(decoder        , converter     )      ||
>      !gst_element_link(converter      , scaler        )      ||
>      !gst_element_link(scaler         , scaler_filter )      ||
>      !gst_element_link(scaler_filter  , freezer       )      ||
>      !gst_element_link(freezer        , freezer_filter)      ||
>      !gst_element_link(freezer_filter , queue         )      ||
>      !newGhostPad(ImageBin , queue , "src" , "image-source")  )
>  { printf("IMAGE_BIN_LINK_ERROR_MSG\n") ; return false ; }
>
>  return true ;
>}
>
>
>int main(int argc , char* argv[])
>{
>  GstElement* sink ;
>
>  gst_init(NULL , NULL) ;
>
>  Pipeline      = gst_pipeline_new("pipeline" ) ;
>  ImageBin      = gst_bin_new     ("image-bin") ;
>  CompositorBin = gst_bin_new     ("compositor-bin") ;
>
>  gst_bin_add(GST_BIN(Pipeline) , ImageBin     ) ;
>  gst_bin_add(GST_BIN(Pipeline) , CompositorBin) ;
>
>  if (!(sink = gst_element_factory_make("xvimagesink"  , "image-sink")) ||
>      !gst_bin_add(GST_BIN(CompositorBin) , sink)                       ||
>      !newGhostPad(CompositorBin , sink , "sink" , "image-sink")         )
>    return 255 ;
>
>  if (!configureImageBin()) return 255 ;
>
>  if (!gst_element_link(ImageBin  , CompositorBin)) return 255 ;
>
>  gst_element_set_state(Pipeline , GST_STATE_PLAYING) ;
>
>  usleep(10000000);
>
>  gst_element_set_state(Pipeline , GST_STATE_NULL) ; // this line cause the berserk
>  gst_object_unref(Pipeline) ;
>
>  return 0 ;
>}

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