[gst-devel] python-gst : core dump with sync-message

[Edward Hervey]

Hi,

On 10/16/06, Antoine Pitrou <antoine.pitrou at wengo.fr> wrote:
>
> Hi,
>
> In my attempt to get familiar with the basic features of python-gst I
> get a core dump when using the sync-message signal.
>
> Here is the offending code :
>

You should use these lines before in order to be sure you're using gst
0.10, and tell gobject that you're using threads (because you are
using the synchronous messages coming from a different thread than the
main thread):

import gobject
gobject.threads_init()
import pygst
pygst.require('0.10')


> import gst
> import time
>
> def on_message(bus, message):
>     pass
>
> pipeline = gst.Pipeline("mypipeline")
> src = gst.element_make_from_uri(gst.URI_SRC,
>     "http://commons.wikimedia.org/wiki/Image:Albanian_numbers.ogg",
>     "srcogg")
> sink = gst.element_factory_make("alsasink", "sink")
> pipeline.add(src)
> pipeline.add(sink)
> src.link(sink)
>
> bus = pipeline.get_bus()
> bus.connect("sync-message", on_message)
> bus.enable_sync_message_emission()
> pipeline.set_state(gst.STATE_PLAYING)
> time.sleep(5)
>
>
> The backtrace indicates a problem when entering the Python interpreter:
> does python-gst somehow forget to acquire the GIL?
>
> (gdb) bt
> #0  0x080fac3c in PyFrame_New ()
> #1  0x080b71c6 in PyEval_EvalCodeEx ()
> #2  0x080fc13d in PyFunction_SetClosure ()
> #3  0x0805946c in PyObject_Call ()
> #4  0x080b0583 in PyEval_CallObjectWithKeywords ()
> #5  0x08059443 in PyObject_CallObject ()
> #6  0xb793e1c3 in initgobject () from /usr/lib/python2.4/site-packages/gtk-2.0/gobject.so
> #7  0xb7afc79f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
> #8  0xb7b0b2ea in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
> #9  0xb7b0cb19 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
> #10 0xb7b0ce89 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
> #11 0xb7b4cf06 in gst_bus_sync_signal_handler () from /usr/lib/libgstreamer-0.10.so.0
> #12 0xb7b4d27c in gst_bus_post () from /usr/lib/libgstreamer-0.10.so.0
> #13 0xb7b56460 in gst_element_post_message () from /usr/lib/libgstreamer-0.10.so.0
> #14 0xb7b49a1d in gst_bin_iterate_sorted () from /usr/lib/libgstreamer-0.10.so.0
> #15 0xb7b4971b in gst_bin_iterate_sorted () from /usr/lib/libgstreamer-0.10.so.0
> #16 0xb7b4d053 in gst_bus_post () from /usr/lib/libgstreamer-0.10.so.0
> #17 0xb7b56460 in gst_element_post_message () from /usr/lib/libgstreamer-0.10.so.0
> #18 0xb7b56892 in gst_element_message_full () from /usr/lib/libgstreamer-0.10.so.0
> #19 0xb73f3d66 in gst_base_audio_sink_get_type () from /usr/lib/libgstaudio-0.10.so.0
> #20 0xb7bc1ea6 in gst_base_sink_is_qos_enabled () from /usr/lib/libgstbase-0.10.so.0
> #21 0xb7bc25dc in gst_base_sink_is_qos_enabled () from /usr/lib/libgstbase-0.10.so.0
> #22 0xb7bc29da in gst_base_sink_is_qos_enabled () from /usr/lib/libgstbase-0.10.so.0
> #23 0xb7b6c804 in gst_pad_chain () from /usr/lib/libgstreamer-0.10.so.0
> #24 0xb7b6cfa2 in gst_pad_push () from /usr/lib/libgstreamer-0.10.so.0
> #25 0xb7bc7035 in gst_base_src_set_format () from /usr/lib/libgstbase-0.10.so.0
> #26 0xb7b80d9f in gst_task_get_type () from /usr/lib/libgstreamer-0.10.so.0
> #27 0xb7986448 in g_thread_pool_free () from /usr/lib/libglib-2.0.so.0
> #28 0xb79845a2 in g_static_private_free () from /usr/lib/libglib-2.0.so.0
> #29 0xb7f12341 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
> #30 0xb7e7e4ee in clone () from /lib/tls/i686/cmov/libc.so.6
>
>
> python-gst version is 0.10.4 from Ubuntu Dapper.
>
> Thanks
>
> Antoine.
>
>
>
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-- 
Edward Hervey
Multimedia editing developer / Fluendo S.A.
http://www.pitivi.org/