Realtime priority

[Stefan Kost]

On 22.02.2011 16:16, Mathias Gyllengahm wrote:
> 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?

Are you aware that switching to rt scheduling won't help if too hight
cpu load is the problem. All you get for SCHED_RR/FIFO is more
deterministic execution. If your pipeline is saturating the CPU power,
you can buy a faster machine or optimize code.

Stefan

>
> 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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