Re: Re: shmsrc/shmsink plugin

[Jan Spurný]

Hi,

just an idea - maybe you can try a different approach: forget about shared memory and just split the decoded stream using "tee" element, place a queue in each tee branch (which makes it run in separate thread) and you can do whatever you like in each branch..

sincerely,
Jan Spurny

> ------------ Původní zpráva ------------
> Od: Pazzo Da Legare <pazzodalegare at gmail.com>
> Předmět: Re: shmsrc/shmsink plugin
> Datum: 06.3.2012 10:40:20
> ----------------------------------------
> Could you please help me?
> 
> 2012/2/21 Pazzo Da Legare <pazzodalegare at gmail.com>:
> > I'm trying to use shmsrc/shmsink to decode a video source once and use
> > decoded video from many application so I start testing the plugins
> > using videotestsrc to produce a test stream and many consumer to
> > receive it
> >
> >
> > Producer:
> > gst-launch videotestsrc ! shmsink socket-path=/tmp/dudda
> > shm-size=10000000 wait-for-connection=false preroll-queue-len=5
> >
> > Consumers:
> >
> > gst-launch shmsrc socket-path=/tmp/dudda !
> > "video/x-raw-yuv,format=(fourcc)YUY2, color-matrix=(string)sdtv,
> > chroma-site=(string)mpeg2,width=(int)320, height=(int)240,
> > framerate=(fraction)30/1" ! autovideosink
> >
> > But when I start the fifth (sometimes the forth) consumer I ran into
> > problem: which are the limitation of shmsrc, I wonder the use of a
> > global lock.
> >
> > The message I got is:
> >
> > gst-launch shmsrc socket-path=/tmp/blah !
> > "video/x-raw-yuv,format=(fourcc)YUY2, color-matrix=(string)sdtv,
> > chroma-site=(string)mpeg2,width=(int)320, height=(int)240,
> > framerate=(fraction)30/1" ! autovideosink
> > Setting pipeline to PAUSED ...
> > Pipeline is PREROLLING ...
> > ERROR: from element /GstPipeline:pipeline0/GstCapsFilter:capsfilter0:
> > Filter caps do not completely specify the output format
> > Additional debug info:
> > gstcapsfilter.c(392): gst_capsfilter_prepare_buf ():
> > /GstPipeline:pipeline0/GstCapsFilter:capsfilter0:
> > Output caps are unfixed: EMPTY
> > ERROR: pipeline doesn't want to preroll.
> > Setting pipeline to NULL ...
> > Freeing pipeline ...
> >
> > Any clue?
> >
> > Maurizio
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> 
>