Qt based media player running on ubuntu 18.04.4 leaks memory

[Richard Barrass]

Hello

We have a customer facing application written using Qt (5.12.9) which is running on a customised ubuntu 18.04 (.4) x64 (intel) platform. The customisation is that the UI is limited to a wayland kiosk mode with only our application then running within that.

Part of the applications use case is to play media specified by the operator - in the .mp4 format. I should say that we are operating in portrait orientation, display resolution is therefore 1080 x 1920.

We play media either letter boxed (scaled to be 1080 x 607) or full screen (media is sourced to be 1080 x 1920).

The application can be running for weeks/months without power-cycling. However, we are seeing that we are gradually leaking memory such that the memory is exhausted in just under 24hrs. (4GB physical + 4GB swap) - the app starts at ~8% memory utilisation. Basically, at each transition from one video to playing the next, causes a slight memory leak.

I have been able to determine that the issue is related to the gstreamer libraries - and specifically libav

(my system has the following package)
gstreamer1.0-libav:amd64               1.14.5-0ubuntu1~18.04.1

If I uninstall that package, two things

  1.  I no longer get video playback - but I do get the audio track from the .mp4 file
  2.  No increase over time for the memory usage for my application.

Putting the package back, video returns as does the leak.

I've tried building the latest gstreamer libraries using gst-build - (so version 1.19) and inserting the lib in to the LD_LIBRARY_PATH first (and set GST_PLUGIN_PATH to also point to my installed /opt/gst/lib/ install) but although I perhaps think the leak isn't as great - it does alas, still leak.

My question is "please help"... our application is affectively unfit for purpose due to the dependency of the application needing to play media for days without a restart.

Any information that I can provide to help, please get in touch.

Regards
Richard


--
Richard Barrass
Bassett Electronic Systems Ltd. Solutions under one roof.
T: 01793 859974 E: r.barrass at bassettelectronics.com<mailto:r.barrass at bassettelectronics.com>
Unit 23-25 Whitehill Industrial Estate, Whitehill Lane, Royal Wootton Bassett, Wiltshire, SN4 7DB

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