gstreamer, qt and omxh265.

Robotics & Edge Computing Jetson Systems Jetson TX2
1

Hi,

I would like to know if there is some simple way to view h265 accelerated vidéos, by using qt and the openmax driver from nvidia.

Regards,

Nicolas Bigeard

2

Hi Nicolas,

Do you mean using h265 decoder to watch a h265 encoded video?

3

Please try

gst-launch-1.0 filesrc location=<filename.mp4> ! qtdemux name=demux demux.video_0 ! queue ! h265parse ! omxh265dec ! nvoverlaysink -e
4

Hi WayneWWW, Thanks for the reply, well yes, firstaval I do mean using an h265 decoder : omxh265dec… Of course, I tried the gst-launch line, which works like a charm. With nvoverlaysink or even nveglglessink.

My trouble, is that when using qt 5.9 I just can view the video by using the neoverlaysink… nveglglessink crashes beacause of some glGetString (according to gdb). I can put in the gdb output if you want…

In fact, I tried several ways that were proposed on the nvidia forums :

  • exporting some QT WINDOW environnement variable (I could be more precise if you want).
  • modifying directly the qt video sink related code (in qt itself)
  • using the qtgstreamer lib.

Until now, there is no way I can get qt to work together with gstreamer.

The nvoverlaysink might work from time to time, but sadly the video goes then fullscreen, and there is no way I could get some window upon it…

Regards,

5

nicobi: I am just wondering if you could explain how to view a video with qt using neoverlaysink .
Thanks

6

For instance by typing :

export QT_GSTREAMER_WIDGET_VIDEOSINK=nvoverlaysink
export QT_GSTREAMER_WINDOW_VIDEOSINK=nvoverlaysink

7

ty

8

We support gstreamer and Tegra multimedia APIs on TX1/TX2. For qt, please other users can share experience.

9

Thank you for your answer.