performance issue when building gstreamer from souce

[Lusine]

Hi Folks,
On my Ubuntu 18 machine I have installed gstreamer. Version is 1.16.2.
Running the following command takes 5 second(I've attached screenshot):
<http://gstreamer-devel.966125.n4.nabble.com/file/t379720/gstreamer1.png>
gst-launch-1.0 filesrc location=~/videos/shallow_1280.mp4 ! decodebin !
x264enc ! mp4mux ! filesink location=out.mp4

Then I've uninstalled this gstreamer and built it from the source code with
meson and ninja and now the same command takes 20 seconds. I've tried the
latest master branch and 1.16 branch and both are slow:
<http://gstreamer-devel.966125.n4.nabble.com/file/t379720/gstreamer_built.png>

I don't know why I see this difference? Maybe there is some missing
configuration when building gstreamer, I did the following steps for
building:
git clone https://gitlab.freedesktop.org/gstreamer/gst-build.git
cd gst-build
meson <build_directory>
ninja -C </path/to/build_directory>
ninja -C </path/to/build_directory> install





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[Nicolas Dufresne-5]

Le mer. 18 nov. 2020 10 h 30, Lusine <[hidden email]> a écrit :

Hi Folks,
On my Ubuntu 18 machine I have installed gstreamer. Version is 1.16.2.
Running the following command takes 5 second(I've attached screenshot):
<http://gstreamer-devel.966125.n4.nabble.com/file/t379720/gstreamer1.png>
gst-launch-1.0 filesrc location=~/videos/shallow_1280.mp4 ! decodebin !
x264enc ! mp4mux ! filesink location=out.mp4

Then I've uninstalled this gstreamer and built it from the source code with
meson and ninja and now the same command takes 20 seconds. I've tried the
latest master branch and 1.16 branch and both are slow:
<http://gstreamer-devel.966125.n4.nabble.com/file/t379720/gstreamer_built.png>

I don't know why I see this difference? Maybe there is some missing
configuration when building gstreamer, I did the following steps for
building:
git clone https://gitlab.freedesktop.org/gstreamer/gst-build.git
cd gst-build
meson <build_directory>
ninja -C </path/to/build_directory>
ninja -C </path/to/build_directory> install

Check which decoder is picked by decodebin. It is likely ffmpeg vs openh264.

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[Lusine]

Hi Nicolas,
I've changed my pipeline to explicitly choose the decoder but again I see
huge performance degradation:
gst-launch-1.0 filesrc location=~/videos/shallow_1280.mp4 ! qtdemux !
avdec_h264 ! x264enc ! mp4mux ! filesink location=out.mp4

My build:
<http://gstreamer-devel.966125.n4.nabble.com/file/t379720/build.png>

Installed version:
<http://gstreamer-devel.966125.n4.nabble.com/file/t379720/install.png>




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[GStreamer-devel mailing list]

Hi Folks, This issue still remains: there is huge performance degradation
after building gstreamer from source. What am I missing?



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[GStreamer-devel mailing list]

GStreamer-devel mailing list wrote

> Hi Folks, This issue still remains: there is huge performance degradation
> after building gstreamer from source. What am I missing?
>
>
>
> --
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Quoted from:
http://gstreamer-devel.966125.n4.nabble.com/performance-issue-when-building-gstreamer-from-souce-tp4695919p4697583.html


On what platform are you compiling ?

I assume you're using gst-build with meson. If so, I suggest you to check
the meson-logs.txt file. What feature is enabled/disabled, what library
maybe missing..





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