Hi Ankur,
This looks to mi like a bug in gstreamermm. Could you please report it
here: https://gitlab.gnome.org/GNOME/gstreamermm/issues/new ?
Thank you a lot!
2018-06-14 8:38 GMT+01:00 Ankur Deep Jaiswal <an...@techgentsia.com>:
>
> Hi Daniel,
> sorry for that , please find the GDB trace for it
>
> 1. the GDB trace when we use
> gboolean *query_event*(const Glib::RefPtr<Gst::Pad>& pad,
> Glib::RefPtr<Gst::Query>& queryevent)
> {
> switch (queryevent->get_query_type())
> {
> case Gst::QueryType::QUERY_CAPS:
> {
> Glib::RefPtr<Gst::QueryCaps> querycaps =
> Glib::RefPtr<Gst::QueryCaps>::cast_static(queryevent);
> auto newquerycaps = Glib::RefPtr<Gst::QueryCaps>::
> cast_static(querycaps->create_writable());
> auto caps = Gst::Caps::create_from_string(
> "video/x-h264, stream-format=(string)byte-stream,
> alignment=(string)au");
> newquerycaps->set_caps_result(caps); */
>
> return true;
> }
> }
> return false;
> }
>
> GStreamer-CRITICAL **: 12:55:41.181: gst_mini_object_ref: assertion
> 'mini_object != NULL' failed
>
> #0 0x00007ffff66edc41 in () at /usr/lib/x86_64-linux-gnu/
> libglib-2.0.so.0
> #1 0x00007ffff66eef2b in g_logv () at /usr/lib/x86_64-linux-gnu/
> libglib-2.0.so.0
> #2 0x00007ffff66ef07f in g_log () at /usr/lib/x86_64-linux-gnu/
> libglib-2.0.so.0
> #3 0x00007ffff7897942 in gst_mini_object_ref (mini_object=0x0) at
> gstminiobject.c:344
> old_refcount = <optimized out>
> new_refcount = <optimized out>
> __func__ = "gst_mini_object_ref"
> __PRETTY_FUNCTION__ = "gst_mini_object_ref"
> #4 0x00007ffff78dcee4 in gst_caps_ref (caps=<optimized out>) at
> ../gst/gstcaps.h:210
> result = 0x0
> query = 0x55555589f990
> __func__ = "gst_pad_query_caps"
> __PRETTY_FUNCTION__ = "gst_pad_query_caps"
> #5 0x00007ffff78dcee4 in gst_pad_query_caps (pad=pad@entry=0x5555558a6180,
> filter=filter@entry=0x0) at gstutils.c:3045
> result = 0x0
> query = 0x55555589f990
> __func__ = "gst_pad_query_caps"
> __PRETTY_FUNCTION__ = "gst_pad_query_caps"
> #6 0x00007ffff7899352 in gst_pad_link_check_compatible_unlocked
> (flags=1435133496, sink=0x5555558a6620, src=0x5555558a6180) at gstpad.c:2259
> srccaps = 0x0
> sinkcaps = 0x0
> compatible = 0
> __PRETTY_FUNCTION__ = "gst_pad_link_prepare"
> #7 0x00007ffff7899352 in gst_pad_link_prepare
> (srcpad=srcpad@entry=0x5555558a6180,
> sinkpad=sinkpad@entry=0x5555558a6620,
> flags=flags@entry=GST_PAD_LINK_CHECK_DEFAULT)
> at gstpad.c:2397
> __PRETTY_FUNCTION__ = "gst_pad_link_prepare"
> #8 0x00007ffff78a61ea in gst_pad_link_full (srcpad=0x5555558a6180,
> sinkpad=0x5555558a6620, flags=GST_PAD_LINK_CHECK_DEFAULT) at gstpad.c:2524
> result = <optimized out>
> parent = 0x5555558a41a0
> srcfunc = <optimized out>
> sinkfunc = <optimized out>
> __func__ = "gst_pad_link_full"
> __PRETTY_FUNCTION__ = "gst_pad_link_full"
> #9 0x000055555555970e in main() () at ../src/test_issue.cpp:76
> srcpad = {pCppObject_ = 0x55555587c000}
> sinkpad = {pCppObject_ = 0x5555558ab7a0}
> linkreturn = Gst::PAD_LINK_OK
> major = 1
> minor = 14
> micro = 0
> nano = 0
> main_loop = {pCppObject_ = 0x555555894930}
> nano_str = 0x55555555d41f ""
> pipeline = {pCppObject_ = 0x5555558840a0}
> ---Type <return> to continue, or q <return> to quit---
> rtpbin = {pCppObject_ = 0x5555558a1eb0}
> h264encoder = {pCppObject_ = 0x5555558a1f90}
> rtph264pay = {pCppObject_ = 0x5555558a9850}
> udpsink = {pCppObject_ = 0x5555557eae00}
> host = "127.0.0.1"
> t = {_M_id = {_M_thread = 93824995540992}}
>
>
> 2. the GDB backtrace when we use
>
> virtual bool decide_allocation_vfunc(const Glib::RefPtr<Gst::Query>&
> query) override
> {
> const auto pushsrc = static_cast<BaseClassType*>(g_
> type_class_peek_parent(G_OBJECT_GET_CLASS(gobject_)) // Get the parent
> class of the object class (The original underlying C class).
> );
>
> std::cout << "Query is writable :" << query->is_writable() <<
> std::endl;
>
> const auto base = (GstBaseSrcClass *) pushsrc;
>
> if (base && base->decide_allocation)
> {
> auto * newquery = Glib::unwrap(query);
> bool retval((*base->decide_allocation)((GstBaseSrc *) gobj(),
> newquery));
> return retval;
> }
>
> typedef bool RType;
> return RType();
> }
>
> GStreamer-CRITICAL **: 13:06:42.029: gst_structure_id_take_value:
> assertion 'IS_MUTABLE (structure)' failed
>
> #0 0x00007ffff66edc41 in () at /usr/lib/x86_64-linux-gnu/
> libglib-2.0.so.0
> #1 0x00007ffff66eef2b in g_logv () at /usr/lib/x86_64-linux-gnu/
> libglib-2.0.so.0
> #2 0x00007ffff66ef07f in g_log () at /usr/lib/x86_64-linux-gnu/
> libglib-2.0.so.0
> #3 0x00007ffff78c5154 in gst_structure_id_take_value
> (structure=structure@entry=0x7fffe4003260, field=field@entry=392,
> value=value@entry=0x7fffeef2ea90)
> at gststructure.c:565
> __func__ = "gst_structure_id_take_value"
> #4 0x00007ffff78b619e in ensure_array (s=0x7fffe4003260, quark=392,
> element_size=<optimized out>, clear_func=<optimized out>) at gstquery.c:863
> new_array_val =
> {g_type = 140737018618784, data = {{v_int = -469756720,
> v_uint = 3825210576, v_long = 140737018598608, v_ulong = 140737018598608,
> v_int64 = 140737018598608, v_uint64 = 140737018598608, v_float =
> -9.45073176e+21, v_double = 6.9533325987692788e-310, v_pointer =
> 0x7fffe40014d0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 =
> 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
> array = <optimized out>
> value = <optimized out>
> clear_func = <optimized out>
> element_size = <optimized out>
> s = 0x7fffe4003260
> quark = 392
> array = <optimized out>
> value = <optimized out>
> #5 0x00007ffff78b89b2 in gst_query_get_n_allocation_params
> (query=query@entry=0x7fffe4004450) at gstquery.c:2003
> array = <optimized out>
> structure = <optimized out>
> __func__ = "gst_query_get_n_allocation_params"
> #6 0x00007ffff7b99939 in gst_base_src_decide_allocation_default
> (basesrc=0x5555558a41a0, query=0x7fffe4004450) at gstbasesrc.c:3148
> outcaps = 0x0
> pool = 0x7ffff5ed2760
> size = 21845
> min = 0
> max = 0
> allocator = 0x7fffeef2eb40
> params =
> {flags = (GST_MEMORY_FLAG_READONLY | unknown: 8), align =
> 140737315791691, prefix = 93824994381856, padding = 140737322705423,
> _gst_reserved = {0x1, 0x555555761020 <std::cout@@GLIBCXX_3.4>,
> 0x555555761020 <std::cout@@GLIBCXX_3.4>, 0x7ffff5ed2760
> <_IO_2_1_stdout_>}}
> config = <optimized out>
> update_allocator = <optimized out>
> __PRETTY_FUNCTION__ = "gst_base_src_decide_allocation_default"
> #7 0x000055555555abbd in
> FooSrc::decide_allocation_vfunc(Glib::RefPtr<Gst::Query>
> const&) (this=0x5555558a1f90, query=...) at ../src/Foosrc.h:65
> newquery = 0x7fffe4004450
> retval = false
> pushsrc = 0x555555894e80
> base = 0x555555894e80
> #8 0x00007ffff7537e8b in Gst::BaseSrc_Class::decide_
> allocation_vfunc_callback(_GstBaseSrc*, _GstQuery*) (self=0x5555558a41a0,
> query=0x7fffe4004450)
> at basesrc.cc:885
> obj = 0x5555558a1f90
> ---Type <return> to continue, or q <return> to quit---
> obj_base = <optimized out>
> base = <optimized out>
> #9 0x00007ffff7b9de24 in gst_base_src_prepare_allocation (caps=0x0,
> basesrc=0x5555558a41a0) at gstbasesrc.c:3241
> bclass = 0x555555895a00
> pool = 0x0
> allocator = 0x0
> params =
> {flags = (unknown: 1), align = 140737202285712, prefix =
> 93824995779792, padding = 140737346381359, _gst_reserved = {0x2500000000,
> 0x7fffe4001320, 0x0, 0x0}}
> result = 1
> query = 0x7fffe4004450
> caps = 0x0
> bclass = <optimized out>
> result = <optimized out>
> src = 0x5555558a41a0
> buf = 0x0
> ret = <optimized out>
> position = <optimized out>
> eos = 0
> blocksize = <optimized out>
> pending_events = 0x0
> tmp = <optimized out>
> __PRETTY_FUNCTION__ = "gst_base_src_loop"
> __func__ = "gst_base_src_loop"
> #10 0x00007ffff7b9de24 in gst_base_src_negotiate (basesrc=0x5555558a41a0)
> at gstbasesrc.c:3379
> caps = 0x0
> bclass = <optimized out>
> result = <optimized out>
> src = 0x5555558a41a0
> buf = 0x0
> ret = <optimized out>
> position = <optimized out>
> eos = 0
> blocksize = <optimized out>
> pending_events = 0x0
> tmp = <optimized out>
> __PRETTY_FUNCTION__ = "gst_base_src_loop"
> __func__ = "gst_base_src_loop"
> #11 0x00007ffff7b9de24 in gst_base_src_loop (pad=0x5555558a6180) at
> gstbasesrc.c:2792
> src = 0x5555558a41a0
> buf = 0x0
> ret = <optimized out>
> position = <optimized out>
> eos = 0
> ---Type <return> to continue, or q <return> to quit---
> blocksize = <optimized out>
> pending_events = 0x0
> tmp = <optimized out>
> __PRETTY_FUNCTION__ = "gst_base_src_loop"
> __func__ = "gst_base_src_loop"
> #12 0x00007ffff78d0f59 in gst_task_func (task=0x5555558b64d0) at
> gsttask.c:332
> lock = 0x5555558a61f0
> tself = 0x5555558d6720
> priv = 0x5555558b6480
> __PRETTY_FUNCTION__ = "gst_task_func"
> #13 0x00007ffff67107d0 in () at /usr/lib/x86_64-linux-gnu/
> libglib-2.0.so.0
> #14 0x00007ffff670fe05 in () at /usr/lib/x86_64-linux-gnu/
> libglib-2.0.so.0
> #15 0x00007ffff64846db in start_thread (arg=0x7fffeef2f700) at
> pthread_create.c:463
> pd = 0x7fffeef2f700
> now = <optimized out>
> unwind_buf =
> {cancel_jmp_buf = {{jmp_buf = {140737202288384,
> 6702658702322279373, 140737202286208, 0, 93824995911456, 140737488343936,
> -6702625674632780851, -6702680043168095283}, mask_was_saved = 0}}, priv =
> {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype
> = 0}}}
> not_first_call = <optimized out>
> #16 0x00007ffff5c0788f in clone () at ../sysdeps/unix/sysv/linux/
> x86_64/clone.S:95
>
>
> On Thu, Jun 14, 2018 at 12:41 PM, Daniel Boles <dboles....@gmail.com>
> wrote:
>
>> Maybe someone else will recognise the problem faster, but again, what I'm
>> interested in is when you say "*This fails*", let's get a precise trace
>> about *when* it fails. So a backtrace from GDB, not a verbose runtime
>> log.
>>
>> It's probably an issue with gstmm not implementing some refcount
>> properly, but it's hard for me personally to parse that from the excess of
>> info so far.
>>
>>
>> _______________________________________________
>> gtkmm-list mailing list
>> gtkmm-list@gnome.org
>> https://mail.gnome.org/mailman/listinfo/gtkmm-list
>>
>>
>
>
> --
> Regards
>
> Ankur Deep Jaiswal
> Software Architect
> Techgentsia Software Technologies Private Limited
> Ernakulam
>
> _______________________________________________
> gtkmm-list mailing list
> gtkmm-list@gnome.org
> https://mail.gnome.org/mailman/listinfo/gtkmm-list
>
>
--
Pozdrawiam
Marcin Kolny
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