Solved, gstreamer-0.10-ffmpeg was missing.

sudo add-apt-repository ppa:mc3man/gstffmpeg-keep sudo apt-get update sudo apt-get install gstreamer0.10-ffmpeg

UPDATE:

Not really solved, using this plugin breaks GStreamer:

$ export GST_DEBUG=2 $ ./RPIStreamer 0:00:01.232878440 29169 0x7f0414007320 WARN qtdemux qtdemux_types.c:191:qtdemux_type_get: unknown QuickTime node type iods 0:00:01.233010807 29169 0x7f0414007320 WARN qtdemux qtdemux_types.c:191:qtdemux_type_get: unknown QuickTime node type avc1 0:00:01.233055875 29169 0x7f0414007320 WARN qtdemux qtdemux_types.c:191:qtdemux_type_get: unknown QuickTime node type avcC 0:00:01.233095592 29169 0x7f0414007320 WARN qtdemux qtdemux_types.c:191:qtdemux_type_get: unknown QuickTime node type btrt 0:00:01.235499777 29169 0x7f0414007320 WARN qtdemux qtdemux.c:6006:qtdemux_parse_segments:<qtdemux0> streaming; discarding edit list segments 0:00:01.235563181 29169 0x7f0414007320 WARN qtdemux qtdemux.c:7044:qtdemux_parse_trak:<qtdemux0> unknown version 00000000 0:00:01.236318578 29169 0x7f0414007320 WARN qtdemux qtdemux.c:6006:qtdemux_parse_segments:<qtdemux0> streaming; discarding edit list segments 0:00:01.264479125 29169 0x7f0414007680 WARN playsinkconvertbin gstplaysinkconvertbin.c:481:gst_play_sink_convert_bin_cache_converter_caps:<GstPlaySinkAudioConvert@0x7f03f801a050> No conversion elements 0:00:01.290541635 29169 0x7f04140071e0 WARN ffmpeg gstffmpegdec.c:2299:gst_ffmpegdec_frame:<ffdec_h2640> ffdec_h264: decoding error (len: -1, have_data: 0) 0:00:01.297533958 29169 0xba4d40 WARN basesrc gstbasesrc.c:2625:gst_base_src_loop:<source> error: Internal data flow error. 0:00:01.297562286 29169 0xba4d40 WARN basesrc gstbasesrc.c:2625:gst_base_src_loop:<source> error: streaming task paused, reason not-negotiated (-4) Error: "Internal data flow error."

Hi,

Check the version of gstreamer that the plugin uses. It could be 0.1. In that case the quick and dirty way is to install that version of gstreamer with the corresponding plugin packages.

Hope it helps

I have successfully build QT 5.8.0 on nVidia TX1 board.
But with QML video surface sink element still getting Reddish preview.
https://drive.google.com/open?id=0B8d7zQv-G71oM1JONzlpR2t1OWc

I also tried 5.8.0 QT C++ camera example.
but for this example camera preview seen for 1-2 sec and then ubuntu hangs. And also the preview appear with wrong color conversion format.

So i tried minimal camera example.
https://drive.google.com/open?id=0B8d7zQv-G71odXN6ZTkxRTRuOGM
But when i start camera following error comes
Unable to open the camera "" for read to query the parameter info: "No such file or directory"

So how can i preview UYVY camera preview in this example?

Indeed, you can't do it without modifying Qt even if you add a control to the plugin to modify that parameter.

QtGstreamer provides a QML sink so you don't have to implement it.

Don't think this is solved, uninstalling gst-plugins-vaapi is a workaround at best.

Bug:
Qt Multimedia GStreamer backend doesn't support HW-accelerated video decoding
https://bugreports.qt.io/browse/QTBUG-23761

Hi,

Not a direct answer but maybe the QtGStreamer might be an option.

Hope it helps

@don-prog said:

And what about QQuickItem

You can subclass QQuickItem to create a custom item that you can then use in a Qt Quick scene. In this subclass you can use gstreamer to render a video. So, yes, you can use QQuickItem here. Simply speaking, this is what the Qt Quick Video Item does, too. But please don't ask me how to use gstreamer directly because I have no idea :-)

Solved using version 5.4.2..
Should to exist a bug with missing libraries for Qt 5.5 version

@LuJoRi hello!
I'm very sorry for the so late reply, but I just had some urgent problems, and I had to leave this forum and work with another things.
I see that you shared your advice and sample for this issue as you promised.
So I want to thank you for this!
Unfortunately, I had to do other things, but I think that you helped other users (including chaudhry) to solve this not simple task! :)
Sorry and thank you one more time!

It looks like you're using the Ubuntu packaged Qt and not the one you installed using the installer.
You should check the Kit in QtCreator you're using.

Hi,

Maybe the GStreamer QtGstreamer module might be of interest.

Hope it helps

It will be a good place to start- see if all gstreamer plugins are installed in your device. You can also try ldd and make sure no links are broken.

I have opened the bug ticket https://bugreports.qt.io/browse/QTBUG-50460.

Perhaps it is really a bug and will get fixed in the future ;D

What version of Qt is it ? GStreamer 1.0 support is pretty recent so you might have to enable it when configuring depending on your Qt version