> BTW: As I remember, I saw some environment variable which allows to setup custom video sink... I need to see sources of QtMM... if I'm not mistaked.. maybe it will help...
I have found this env variables: * QT_GSTREAMER_WIDGET_VIDEOSINK * QT_GSTREAMER_WINDOW_VIDEOSINK and try to use it: $export QT_GSTREAMER_WIDGET_VIDEOSINK=nv_omx_hdmi_videosink $export QT_GSTREAMER_WINDOW_VIDEOSINK=nv_omx_hdmi_videosink $./my-qml-video-player but, this does not help... BR, Denis 2016-05-25 8:30 GMT+03:00 Denis Shienkov <[email protected]>: > > Gstreamer 1.0+ goes some way to addressing these issues.... > > The Apalis T30 board has GPU from the NVidia. So, when I use 'gst-inspect' > I see some of 'nv' sinks. > So, as I understand, the easy ways to do it are: > > 1) I should try to use GStreamer 1.0 (instead of 0.10) "as is" with QtMM > (rebuild QtMM with this GStreamer), at first stage. > > 2) I need try to change QtMM sources and try to set the specific > vendor-video sinks there, at second stage... (in case the first stage does > not work). > > Is it? > > BTW: As I remember, I saw some environment variable which allows to setup > custom video sink... I need to see sources of QtMM... if I'm not mistaked.. > maybe it will help... > > > but even within the standard packages there still seems to be multiple > APIs for codecs which produce EGL surfaces and none of them have been > utilized in QtMultimedia yet > > Could you please provide an examples of this API which is not adopted in > QtMM? > > > > BR, > Denis > > > 25.05.2016 4:44, Andrew den Exter пишет: > > The short answer is some amount of platform adaptation will be required to > enable hardware acceleration on your board. Looking at the page you linked > to; that adaptation might be achieved by creating an implementation > of QGstBufferPoolPlugin (gstreamer 0.10 only) which exposes EGL surfaces > associated with the x-nv-yuv buffers produced by the accelerated codec. > Or you might also need to create your own video node by implementing > QSGVideoNodeFactoryPlugin or > something more invasive may be required, it really depends on how the > vendor implemented their gstreamer plugins > > The reason hardware acceleration doesn't just work is that hardware > vendors have traditionally had to create extensions to gstreamer in order > to implement their hardware accelerated plugins, and these extensions tend > to require a vendor specific video sink to work. If all you care about is > rendering to the full dimensions of a native window then autovideosink will > generally resolve to that vendor specific video sink and that's why the > standard example command line examples tend to work. But when it comes to > something more complicated like compositing into an opengl scene or even as > simple as rendering to a sub rect of a window then you're into the realm of > vendor extensions and without a port to your specific hardware it probably > won't work. Gstreamer 1.0+ goes some way to addressing these issues, but > even within the standard packages there still seems to be multiple APIs for > codecs which produce EGL surfaces and none of them have been utilized in > QtMultimedia yet. > > > Andrew > > > On Wed, May 25, 2016 at 12:40 AM, Denis Shienkov <[email protected] > > wrote: > >> Hi all. >> >> I have the Toradex (Apalis T30) embedded board: >> >> https://www.toradex.com/computer-on-modules/apalis-arm-family/nvidia-tegra-3 >> >> which has: >> >> http://developer.toradex.com/files/toradex-dev/uploads/media/Colibri/Linux/Images/Apalis_T30_LinuxImageV2.6Beta1_20160331.tar.bz2 >> >> Linux Image, with the GStreamer 0.10. >> >> Also I have compiled Qt 5.6 and installed it to the board. >> >> When I try to play any *.MP4 video file from the QML Video item: >> http://doc.qt.io/qt-5/qml-qtmultimedia-video.html >> >> I see, that my video has very-very lags, and I see (with htop utility) >> that CPU loading is ~300% ( >> three cores running on ~100%). >> >> But, when I try to play the video, using the 'nvgstplayer' utility, I see >> that CPU loading is ~46% and all fine. Seems, the QML player loads the SW >> codecs instead of HW codecs... >> >> Is there are any way to say to QML player to use a HW codecs? Or, maybe, >> I need to fix a sources of QtMM (where I need to change it?) Or, maybe, is >> there are another way to do this? >> >> Otherwise, is just a **HELL** and there is no sense in QML QtMultimedia >> at all (But I need QML for anumations). And I do not know, how to fix it >> (I'm not expert in GStreamer). >> >> PS: I have tried the 'gst-launch' pipelines instead of 'nvgstplayer', as >> described here: >> http://developer.toradex.com/knowledge-base/video-playback-%28linux%29 >> but it crashes with sigsegv.... >> >> BR, >> Denis >> >> >> >> >> >> >> >> _______________________________________________ >> Development mailing list >> [email protected] >> http://lists.qt-project.org/mailman/listinfo/development >> >> > >
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