[gst-devel] Gstreamer and Cocoa run loops

[Jonathan Lyons]

I'm having a lot of difficulty integrating the bus of a Gstreamer pipeline with a Cocoa run loop. Right now I'm using a CFMessagePort to turn a sync signal on one thread into an async event on the main thread. However, this results in weird delays and bugs. 

Has anyone on this list tried this? Would it be better to run all media operations on another thread which itself runs a glib main loop? 

I look forward to any response. Thank you.

On Jan 30, 2011, at 8:53 AM, Nicolas Bertrand wrote:

> Hi,
> I use gstreamer via pygst.
> with the version 0.10.32 from launchpad dev. ppa I did not success to 
> execute add_buffer_probe = The callback is never executed.
> 
> This works fine with an older version of python-gst / libgstreamer. (cf. 
> version details below)
> 
> Code Example :
> 
>   def _capture_start_cb(self, wbin, b) :
> 
>         pad = self.get_by_name("JpegEncoder").src_pads().next()
> 
>         self._grabprobe = pad.add_buffer_probe(self._cb_process_frame, True)
> 
> 
> 
>     def  _cb_process_frame(self, pad, gst_buffer, ret):
> 
>         """ Callbak to inidicate that buffer is available from probe """
> 
> 
> 
>         pad.remove_buffer_probe(self._grabprobe)
> 
> 
>         return True
> 
> 
> Did somebody know if it is a misuse or a real problem ( in that case I 
> fill a bug) ?
> 
> cheers,
> nico
> 
> Problem constated Versions :
> Ubuntu/lucid (64 bits)
> python-gst0.10 0.10.21-1~lucid1
> libgstreamer0.10-0 0.10.32-1~lucid1
> 
> No problem constated version :
> Ubuntu/maverick (32 bits)
> python-gst0.10 0.10.19.4-1~lucid1
> libgstreamer0.10-0 0.10.32-1~lucid1
> 
> 
> 
> 
> 
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