shmsrc/shmsink plugin

[Pazzo Da Legare]

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