[gst-devel] Performance with gst-launch pipeline and playbin

[Manish Sharma]

Hi,

Thanks to all for replying back.

2008/11/14 Zhao, Halley halley.zhao at intel.com
1.       playbin will always link ffmpegcolorspace and videoscale into the
pipeline, it will impact the performance compare to customized pipeline.

Hi Zhao,

I apologize for not mentioning this in advance. We are doing this testing on
ARM platform. We have disabled ffmpegcolorspace and videoscale inside
playbin code. so that our video pipeline should look similar to the one
which I have mentioned in customized pipeline.

gst-launch filesrc location=/media/sdmmc0p1/Comebacks.avi ! avidemux
name=demux { demux.audio_00 ! queue ! omx_mp3dec ! alsasink } {
demux.video_00 ! queue ! omx_h264dec ! xvimagesink }


One more behaviour I have observed while debugging with PowerTrace
hardware that playbin creates 12 threads for the following command while
similar specific pipeline creates 10 thread. What are these extra 2 threads
created by playbin? Is there any clue on the same?

1) with playbin (12 threads)

gst-launch playbin uri=file:///media/sdmmc0p1/Comebacks.avi

2) with gst-launch specific pipeline (10 threads)

gst-launch filesrc location=/media/sdmmc0p1/Comebacks.avi ! avidemux
name=demux { demux.audio_00 ! queue ! omx_mp3dec ! alsasink } {
demux.video_00 ! queue ! omx_h264dec ! xvimagesink }

Regards,
Manish



2008/11/14 Zhao, Halley <halley.zhao at intel.com>

>  1.       playbin will always link ffmpegcolorspace and videoscale into
> the pipeline, it will impact the performance compare to customized pipeline.
>
> 2.       man gst-launch-0.10 you will see the option "—gst-debug=STRING",
> next  "gst-launch-0.10 –gst-debug-help" you will see the category
>
> for example:
>
> gst-launch-0.10
> --gst-debug=GST_AUTOPLUG:5,xvimagesimk:5,GST_DATAFLOW:5,playbin:5
> --gst-debug-no-color playbin uri=file:///home/ume/work/test.m2v
>
>
>   ------------------------------
>
> *From:* Manish Sharma [mailto:manishsharma13 at gmail.com]
> *Sent:* 2008年11月13日 16:57
> *To:* gstreamer-devel at lists.sourceforge.net
> *Subject:* [gst-devel] Performance with gst-launch pipeline and playbin
>
>
>
> Hi All,
>
>
>
> While using the playbin for playback I am observing more CPU usage as
> compared to gstreamer customized pipeline.
>
> I know that playbin adds some preroll queue before audio video sink. But
> will it add so much of CPU usage.
>
> I have used 'top' utility to check the CPU usage.
>
>
>
> Basically there are two commands which we have used:
>
>
>
> 1) with playbin
>
>
>
> gst-launch playbin uri=file:///media/sdmmc0p1/Comebacks.avi
>
>
>
> 2) with gst-launch specific pipeline
>
>
>
> gst-launch filesrc location=/media/sdmmc0p1/Comebacks.avi ! avidemux
> name=demux { demux.audio_00 ! queue ! omx_mp3dec ! alsasink } {
> demux.video_00 ! queue ! omx_h264dec ! xvimagesink }
>
>
>
> with (1) we are getting around 20% more CPU consumption wrt (2).
>
>
>
>
>
> I need one more info is there any way to dump the pipeline created using
> playbin? I know GST_DEBUG=GST_ELEMENT_FACTORY:3 & GST_DEBUG=*:3.
>
> If there is any specific flag which can give me only the pipeline elements
> and their connection.
>
>
>
> Regards,
>
> Manish
>
>
>
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