Pipeline freeze at preroll on embedded system

[Julian Scheel]

Actually it does not really work. It just freezes at a later point
gst-launch-1.0 fakesrc is-live=true num-buffers=50 ! fakesink
will never terminate.

Am Sonntag, den 20.01.2013, 12:19 +0100 schrieb Julian Scheel:
> I just discovered that this pipeline works:
> gst-launch-1.0  fakesrc is-live=true ! fakesink
> 
> Any ideas why is-live would make the pipeline work?
> 
> Am Freitag, den 18.01.2013, 21:46 +0100 schrieb Julian Scheel:
> > Hi,
> > 
> > I am running a buildroot (uclibc) based system on raspberry pi. I just
> > updated gstreamer from 0.10 to 1.0.5. This introduced a very odd
> > problem. Every pipeline freezes in preroll state. Actually even a
> > simple:
> > gst-launch-1.0 fakesrc ! fakesink
> > causes the pipeline to freeze in preroll.
> > 
> > I have attached a logfile with GST_DEBUG=*:5 messages as well as a
> > picture of the created pipeline, which looks fine.
> > 
> > If I attach gdb to the process and grab a bt it looks like this:
> > (gdb) thread apply all bt
> > 
> > Thread 2 (Thread 0xb6b754d0 (LWP 184)):
> > #0  0xb6cabbbc in pthread_cond_wait () from /lib/libpthread.so.0
> > #1  0xb6d861a4 in g_cond_wait () from /usr/lib/libglib-2.0.so.0
> > #2  0xb6b96210 in gst_base_sink_wait_preroll (sink=sink at entry=0x1fac050)
> > at gstbasesink.c:2050
> > #3  0xb6b96630 in gst_base_sink_do_preroll (sink=sink at entry=0x1fac050,
> > obj=obj at entry=0x1fb4048)
> >     at gstbasesink.c:2140
> > #4  0xb6b9788c in gst_base_sink_do_sync
> > (basesink=basesink at entry=0x1fac050, obj=obj at entry=0x0, late=0xb6bbb34c, 
> >     late at entry=0x1fb4048, step_end=0x0, step_end at entry=0xb6b74c90) at
> > gstbasesink.c:2341
> > #5  0xb6b99fa8 in gst_base_sink_chain_unlocked
> > (basesink=basesink at entry=0x1fac050, obj=obj at entry=0x1fb4048, 
> >     is_list=33186016, is_list at entry=0, pad=<error reading variable:
> > Unhandled dwarf expression opcode 0xfa>)
> >     at gstbasesink.c:3189
> > #6  0xb6b9bad4 in gst_base_sink_chain_main (basesink=0x1fac050,
> > pad=<optimized out>, obj=0x1fb4048, is_list=0)
> >     at gstbasesink.c:3323
> > #7  0xb6ec3e58 in gst_pad_chain_data_unchecked (data=0x1fb4048,
> > type=<optimized out>, pad=0x1faa170)
> >     at gstpad.c:3654
> > #8  gst_pad_push_data (pad=0x1faa028, pad at entry=0x0,
> > type=type at entry=4112, data=<optimized out>, data at entry=0x0)
> >     at gstpad.c:3871
> > #9  0xb6ecb904 in gst_pad_push (pad=0x0, pad at entry=0x1faa028,
> > buffer=0x0) at gstpad.c:3974
> > #10 0xb6ba1250 in gst_base_src_loop (pad=0x1faa028) at gstbasesrc.c:2710
> > #11 0xb6ef70c0 in gst_task_func (task=task at entry=0x1fb0000) at
> > gsttask.c:316
> > #12 0xb6ef8250 in default_func (tdata=<optimized out>, pool=<optimized
> > out>) at gsttaskpool.c:70
> > #13 0xb6d6b488 in ?? () from /usr/lib/libglib-2.0.so.0
> > #14 0xb6d6b488 in ?? () from /usr/lib/libglib-2.0.so.0
> > Backtrace stopped: previous frame identical to this frame (corrupt
> > stack?)
> > 
> > Thread 1 (Thread 0xb6f58000 (LWP 183)):
> > #0  0xb6c88190 in read () from /lib/libc.so.0
> > #1  0xb6c88184 in read () from /lib/libc.so.0
> > #2  0xb6d85fa4 in g_mutex_lock () from /usr/lib/libglib-2.0.so.0
> > #3  0xb6d46b0c in g_main_context_check () from /usr/lib/libglib-2.0.so.0
> > #4  0xb6d46f5c in ?? () from /usr/lib/libglib-2.0.so.0
> > Cannot access memory at address 0x0
> > #5  0xb6d46f5c in ?? () from /usr/lib/libglib-2.0.so.0
> > Cannot access memory at address 0x0
> > Backtrace stopped: previous frame identical to this frame (corrupt
> > stack?)
> > 
> > The same pipeline works perfectly fine with
> > gst-launch-0.10 fakesrc ! fakesink.
> > 
> > I did not change any build options between the gstreamer-0.10 and
> > gstreamer-1.0 build, nor did I change the toolchain or any toolchain
> > parameters.
> > 
> > Right now I am pretty clueless what's wrong. Any thoughs on what to
> > check would be more than welcome!
> > 
> > Regards,
> > Julian
> > _______________________________________________
> > gstreamer-devel mailing list
> > gstreamer-devel at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
> 
> 
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