[gst-devel] signal in multithreaded program

Benjamin Otte in7y118 at public.uni-hamburg.de
Wed Jun 30 03:47:05 CEST 2004

I'd say you're either missing something in your code or spider screws up
somewhere. But without seeing that code it's not that easy to say.
gst-launch -v { filesrc location=/your/file ! spider ! { queue !
ffcolorspace ! fakesink } }  should work though (as in print out lots of
lines about buffers arriving on fakesink.


On Wed, 30 Jun 2004, Frank Cheng wrote:

> Hello,
> I am writing a program to display a piece of video. Gstreamer is used as
> the multimedia framework and Gtk is used to make the GUI. I tried a
> multithreaded method but got some problems. Please help.
> In the main thread, I added a  "filesrc" and a "spider". Then after the
> spider, I created another thread, and put a "queue", a  "ffcolorspace"
> and a "fakesink".  So I could do the decoder work in the main thread and
> the colorspace conversion in the other thread.
> To get the data out from this pipeline, I linked a callback function,
> which dealt with the video data, to the "handoff" signal of the
> fakesink. Note the fakesink is in the new thread.
> However, the program never runs. It hangs after the pipeline is built.
> It seems that it stayed in the "gst_iterate", but no data is pass
> through this fakesink. The callback function has never been called. I
> guess the "handoff" signal in the new thread is somehow lost in somewhere.
> Please help me.
> Cheers,
> Frank
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