rtspsrc cpu optimization

[Eloi Bail]

On Tue, Oct 14, 2014 at 3:26 PM, Eloi Bail <eloi.bail at gmail.com> wrote:
>
>> 7% on what platform? If it's anything above Core-i3, it is a significant
>> load
>>
>
> It is a quite old platform
> (http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPC8347E)
> with a  667 Mhz CPU.
> Actually we used a proprietary solution based on live555 library. Recording
> files on the same camera, CPU consumption is around 2% while it reach more
> than 10% using gstreamer.
>
> However it looks like gstreamer is stronger on RTP jitter.
> I am a gstreamer lover and it is a fact that it offers lot of features
> compared to other solutions. But it is a bit hard to justify such a
> consumption difference.
>
>
>> Jitter buffer handling isn't needed if your RTP packets are coming over
>> TCP,
>> isn't it? You shouldn't have out of order packets unlike UDP
>
> Indeed it would not be. As far as I know Gstreamer does not do that (only
> RTSP packets) am I right ?
>
>>
>> Check where the load is, precisely which line is taking more cycles. That
>> should give more clue
>>
>
> That is what I am trying to do. I was using too kernel tool Perf. I used
> perf top running 0, then 1, 2 , 3, 4 pipelines (gst-launch-1.0 rtspsrc
> location=rtsp://xxx ! fakesink)
>
> See the result in attachment. I do not see for the moment that something
> really consume CPU. I see increasing p_thread_mutex_lock.
> Doing I see also 10 simultaneous threads running !
>
> As live555 is monothread and event-driven it could explain such a
> consumption difference.
>
> I would like to decrease thread creation having less elements. Gathering
> gstrtpsession, gstrtpssrcdemux, gstjitterbuffer, gstrtpptdemux into one big
> "RtpBin" element would be a idea.
>
> I would like to have first your advice.
>
> Thanks,
>
> Eloi
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