Re: [Gtk2hs-users] GStreamer question

[Milan M. <ziv...@gm...>]

Actually, segfault was due to name clash.

When I rename connect to connect_foo it works as expected.
http://hpaste.org/70111

So the bug is probably in gtk2hs.

On Mon, Jun 18, 2012 at 11:58 AM, Milan Marković <ziv...@gm...>wrote:

> Ok, I have tried your test program.
>
> This works:
> http://hpaste.org/70103 (having fakesink as a sink filter)
>
> but this http://hpaste.org/70104
> SEGFAULTS, as you said
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0000003cc2279acd in gst_element_link_pads_filtered () from
> /usr/lib64/libgstreamer-0.10.so.0
> (gdb) backtrace
> #0 0x0000003cc2279acd in gst_element_link_pads_filtered () from
> /usr/lib64/libgstreamer-0.10.so.0
> #1 0x0000000000400a85 in connect ()
> #2 0x0000003cad047914 in ?? () from /usr/lib64/libX11.so.6
> #3 0x0000003cad047152 in _X11TransConnect () from /usr/lib64/libX11.so.6
> #4 0x0000003cad022968 in _X11TransConnectDisplay () from
> /usr/lib64/libX11.so.6
> #5 0x0000003cad036f96 in XOpenDisplay () from /usr/lib64/libX11.so.6
> #6 0x00002aaaaeb9859c in gst_pad_peer_accept_caps () from
> /usr/lib64/gstreamer-0.10/libgstximagesink.so
> #7 0x00002aaaaeb99b38 in gst_pad_peer_accept_caps () from
> /usr/lib64/gstreamer-0.10/libgstximagesink.so
> #8 0x0000003cc223d1d0 in gst_element_change_state () from
> /usr/lib64/libgstreamer-0.10.so.0
> #9 0x0000003cc223d60d in ?? () from /usr/lib64/libgstreamer-0.10.so.0
> #10 0x0000003cc222f074 in ?? () from /usr/lib64/libgstreamer-0.10.so.0
> #11 0x0000003cc223d1d0 in gst_element_change_state () from
> /usr/lib64/libgstreamer-0.10.so.0
> #12 0x0000003cc223d60d in ?? () from /usr/lib64/libgstreamer-0.10.so.0
> #13 0x0000000000400c86 in player ()
> #14 0x0000000000400ccb in main ()
>
>
> It has X-related calls in the backtrace, so I guess the problem is we
> didn't initialize something needed by that window to be shown.
>
> I have tried to call XInitThreads and XOpenDisplay prior to any gstreamer
> code, but it doesn't change anything.
>
>
> I will check with gstreamer community and post my findings here.
>
>
>
> On Mon, Jun 18, 2012 at 1:58 AM, <wag...@se...> wrote:
>
>> Quoting Milan Markovi? <ziv...@gm...>:
>>
>> > 2. When I construct a graph to test my filter in following code
>> > http://hpaste.org/69925 and load the code in ghci it SEGFAULTs. When I
>> > compile and run everything seems OK but no ximagesink's window ever
>> > appears. Did I forget to initialize something in Glib? gst-launch with
>> the
>> > exact same filters shows the window.
>>
>> I can't reproduce the ghci segfault. I can only think of two avenues
>> to pursue here:
>>
>> 1. Have you tried using ghci -fno-ghci-sandbox?
>> 2. By any chance, are you using GHC 7.2? Somebody mentioned on
>> #haskell the other day that they were having some problems with GHC
>> 7.2 and I haven't had a chance to attempt to reproduce them.
>>
>> As for the ximagesink window not appearing, I think the right next
>> step is to ask a gstreamer expert. For example, we could post a
>> question to StackOverflow or similar. Likely the gstreamer experts
>> will want to read C code, so I made an attempt at a straightforward
>> translation of your code to C: <http://hpaste.org/70088>. However, it
>> segfaults on the gst_element_set_state line. If you can get that code
>> running, then we can do one of two things:
>>
>> 1. if no ximagesink window appears, then it's not gtk2hs' fault, and
>> we can ask a gstreamer expert for more help
>> 2. if an ximagesink window does appear, then we can investigate the
>> difference between the calls gtk2hs is making and the calls the C
>> version is making
>>
>> Good luck!
>> ~d
>>
>>
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>
>