Realtime priority

[Mathias Gyllengahm]

Hi again,

I'd like to let my gstreamer process have realtime priority. I have tried to
do it with prefix the whole thing with "chrt -r -p 99" but I get:

GThread-ERROR **: file /build/buildd/glib2.0-2.24.1/gthread/gthread-posix.c:
line 348 (g_thread_create_posix_impl): error 'Invalid argument' during
'pthread_attr_setschedparam (&attr, &sched)'

Doing a chrt by pid afterwards has no effect at all. This is my pipeline,
and it's clear that it has problems when cpu load goes up - and I'd like to
avoid that. I've seen something about realtime priorities when it comes to
using the API - but is there a way to do it when using gst-launch?

Thanks in advance,
/Mathias

/usr/local/bin/gst-launch-0.10 -v
--gst-plugin-path=/usr/local/lib/gstreamer-0.10 \
    v4l2src \
    ! videorate \
    ! video/x-raw-yuv,width=320,height=240,framerate=15/1 \
    ! ffmpegcolorspace \
    ! x264enc bitrate=152 subme=4 b-pyramid=true weightb=true \
    ! queue2 \
    ! flvmux name=mux \
    alsasrc device=hw:0,0 \
    ! audio/x-raw-int,rate=22050,channels=2,depth=16 \
    ! audiorate \
    ! queue2 max-size-buffers=600 max-size-bytes=0 max-size-time=0 \
    ! audioconvert \
    ! lamemp3enc target=1 bitrate=40 mono=true encoding-engine-quality=1
target=bitrate \
    ! mux. mux. \
    ! queue2 \
    ! filesink location=outfile.flv sync=false
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